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  <attribute name="Conventions" value="CF-1.8, ACDD-1.3" />
  <attribute name="featureType" value="timeSeries" />
  <attribute name="title" value="Ground based in situ observations of smps at Madrid (ES0021U)" />
  <attribute name="keywords" value="ACTRIS, particle_number_size_distribution, aerosol, number_concentration_of_positive_ions_in_dry_aerosol_particles_in_air, Madrid, ES0021U" />
  <attribute name="id" value="AUHF-T9ZV.nc" />
  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="ACTRIS" />
  <attribute name="acknowledgement" value="Request acknowledgement details from data originator" />
  <attribute name="doi" value="https://doi.org/10.48597/AUHF-T9ZV" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Francisco Gomez-Moreno, Begona Artinano, Francisco Gomez-Moreno, Begona Artinano, Francisco Gomez-Moreno, Begona Artinano, particle_number_size_distribution - smps at Madrid, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/AUHF-T9ZV" />
  <attribute name="summary" value="Ground based in situ observations of smps at Madrid (ES0021U). These measurements are gathered as a part of the following projects ACTRIS and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: particle_number_size_distribution in aerosol (number_concentration_of_positive_ions_in_dry_aerosol_particles_in_air), particle_number_size_distribution in aerosol (number_concentration_of_positive_ions_in_dry_aerosol_particles_in_air), particle_number_size_distribution in aerosol (number_concentration_of_positive_ions_in_dry_aerosol_particles_in_air)" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="ES09L, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Spain" />
  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2020-05-28T00:00:00 UTC" />
  <attribute name="date_metadata_modified" value="2020-05-28T00:00:00 UTC" />
  <attribute name="creator_name" value="Francisco Gomez-Moreno, Begona Artinano, Francisco Gomez-Moreno, Begona Artinano, Francisco Gomez-Moreno, Begona Artinano" />
  <attribute name="creator_type" value="person" />
  <attribute name="creator_email" value="fj.gomez@ciemat.es, b.artinano@ciemat.es, fj.gomez@ciemat.es, b.artinano@ciemat.es, fj.gomez@ciemat.es, b.artinano@ciemat.es" />
  <attribute name="creator_institution" value="&quot;Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Environment Department, CIEMAT&quot;, &quot;Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Environment Department, CIEMAT&quot;, &quot;Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Environment Department, CIEMAT&quot;, &quot;Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Environment Department, CIEMAT&quot;, &quot;Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Environment Department, CIEMAT&quot;, &quot;Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Environment Department, CIEMAT&quot;" />
  <attribute name="contributor_name" value="Francisco Gomez-Moreno, Elisabeth Alonso-Blanco, Francisco Gomez-Moreno, Elisabeth Alonso-Blanco, Francisco Gomez-Moreno, Laura Martin" />
  <attribute name="contributor_role" value="data submitter, data submitter, data submitter, data submitter, data submitter, data submitter" />
  <attribute name="publisher_type" value="institution" />
  <attribute name="publisher_name" value="NILU - Norwegian Institute for Air Research, ATMOS, EBAS" />
  <attribute name="publisher_institution" value="NILU - Norwegian Institute for Air Research, ATMOS, EBAS" />
  <attribute name="publisher_email" value="ebas@nilu.no" />
  <attribute name="publisher_url" value="https://www.nilu.no/" />
  <attribute name="geospatial_bounds" value="POINT Z (40.456436 -3.725631 669.0)" />
  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
  <attribute name="geospatial_lat_min" type="double" value="40.456436" />
  <attribute name="geospatial_lat_max" type="double" value="40.456436" />
  <attribute name="geospatial_lon_min" type="double" value="-3.725631" />
  <attribute name="geospatial_lon_max" type="double" value="-3.725631" />
  <attribute name="geospatial_vertical_min" type="double" value="669.0" />
  <attribute name="geospatial_vertical_max" type="double" value="669.0" />
  <attribute name="geospatial_vertical_positive" value="up" />
  <attribute name="time_coverage_start" value="2017-01-01T00:00:00 UTC" />
  <attribute name="time_coverage_end" value="2019-08-02T12:00:00 UTC" />
  <attribute name="time_coverage_duration" value="P0002-07-01T12:00:00" />
  <attribute name="time_coverage_resolution" value="P0000-00-00T01:00:00" />
  <attribute name="timezone" value="UTC" />
  <attribute name="ebas_data_definition" value="EBAS_1.1" />
  <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="ebas_citation" value="Francisco Gomez-Moreno, Begona Artinano, Francisco Gomez-Moreno, Begona Artinano, Francisco Gomez-Moreno, Begona Artinano, particle_number_size_distribution - smps at Madrid, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/AUHF-T9ZV" />
  <attribute name="ebas_set_type_code" value="TI" />
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  <attribute name="ebas_file_creation" value="2023-12-18T20:47:33.150673 UTC" />
  <attribute name="ebas_export_state" value="2020-06-18T18:09:37.813000 UTC" />
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  <attribute name="ebas_startdate" value="20170101000000" />
  <attribute name="ebas_revision_date" value="20200528000000" />
  <attribute name="ebas_version" value="1" />
  <attribute name="ebas_version_description" value="initial revision" />
  <attribute name="ebas_data_level" value="2" />
  <attribute name="ebas_period_code" value="3y" />
  <attribute name="ebas_resolution_code" value="1h" />
  <attribute name="ebas_sample_duration" value="1h" />
  <attribute name="ebas_orig_time_res" value="270s" />
  <attribute name="ebas_station_code" value="ES0021U" />
  <attribute name="ebas_platform_code" value="ES0021S" />
  <attribute name="ebas_station_name" value="Madrid" />
  <attribute name="ebas_station_latitude" value="40.456436" />
  <attribute name="ebas_station_longitude" value="-3.725631" />
  <attribute name="ebas_station_altitude" value="669.0 m" />
  <attribute name="ebas_measuremenet_latitude" value="40.456436" />
  <attribute name="ebas_measurement_longitude" value="-3.725631" />
  <attribute name="ebas_measurement_altitude" value="669.0 m" />
  <attribute name="ebas_measurement_height" value="3.0 m" />
  <attribute name="ebas_regime" value="IMG" />
  <attribute name="ebas_laboratory_code" value="ES09L" />
  <attribute name="ebas_instrument_type" value="smps" />
  <attribute name="ebas_instrument_name" value="TSI_3936_CIE1" />
  <attribute name="ebas_instrument_manufacturer" value="TSI" />
  <attribute name="ebas_instrument_model" value="3936" />
  <attribute name="ebas_instrument_serial_number" value="70838465" />
  <attribute name="ebas_method_ref" value="ES09L_smps_01_107bins" />
  <attribute name="ebas_standard_method" value="SOP=Wiedensohler2012" />
  <attribute name="ebas_inlet_type" value="Impactor--direct" />
  <attribute name="ebas_inlet_description" value="The sampling line is a 3-m long, 1/4&quot; diameter pipe with a weatherproof inlet to prevent rain to enter." />
  <attribute name="ebas_humidity_temperaure_control" value="Nafion dryer" />
  <attribute name="ebas_humidity_temperaure_control_description" value="sample dried to below 40% RH with nafion dryer operated with reduced pressure sheath air" />
  <attribute name="ebas_volume_std_temperature" value="273.15 K" />
  <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
  <attribute name="ebas_measurement_uncertainty_expl" value="This instrument participated in an MPSS intercomparison campaign at TROPOS during November 2017 and passed the quality standards of ACTRIS and GAW. It showed a concentration 1% lower than the Reference Instrument using the TROPOS evaluation software" />
  <attribute name="ebas_zero_negative_values_code" value="Zero possible" />
  <attribute name="ebas_zero_negative_values" value="Zero values may appear due to statistical variations at very low concentrations" />
  <attribute name="ebas_qa1_measure_id" value="WCCAP-MPSS-2017-6" />
  <attribute name="ebas_qa1_date" value="2017-11-17 UTC" />
  <attribute name="ebas_qa1_document_url" value="http://www.actris-ecac.eu/files/ECAC-report-MPSS-2017-6-1.pdf" />
  <attribute name="ebas_organization" value="ES09L, &quot;Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Spain&quot;, , , , , , , " />
  <attribute name="ebas_framework_acronym" value="ACTRIS" />
  <attribute name="ebas_framework_name" value="European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases" />
  <attribute name="ebas_framework_description" value="ACTRIS is the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases. ACTRIS is composed of observing stations, exploratory platforms, instruments calibration centres, and a data centre." />
  <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre" />
  <attribute name="ebas_framework_contact_email" value="clm@nilu.no" />
  <attribute name="ebas_originator" value="Artinano, Begona, b.artinano@ciemat.es, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Environment Department, Av. Complutense 40, , E-28040, Madrid, Spain" />
  <attribute name="ebas_submitter" value="Martin, Laura, laura.martin@ciemat.es, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Environment Department, Av. Complutense 40, , E-28040, Madrid, Spain" />
  <attribute name="ebas_acknowledgement" value="Request acknowledgement details from data originator" />
  <attribute name="ebas_comment" value="The system was checked for sample and sheath flows and high-voltage supply in a regular base. In addition, some latex calibrations were performed along the year to check the correct whole instrument operation." />
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  <attribute name="geospatial_lon_units" value="degrees_east" />
  <attribute name="comment" value="{&#xA;    &quot;Data definition&quot;: &quot;EBAS_1.1&quot;,&#xA;    &quot;Data license&quot;: &quot;https://creativecommons.org/licenses/by/4.0/&quot;,&#xA;    &quot;Citation&quot;: &quot;Francisco Gomez-Moreno, Begona Artinano, Francisco Gomez-Moreno, Begona Artinano, Francisco Gomez-Moreno, Begona Artinano, particle_number_size_distribution - smps at Madrid, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/AUHF-T9ZV&quot;,&#xA;    &quot;Set type code&quot;: &quot;TI&quot;,&#xA;    &quot;Timezone&quot;: &quot;UTC&quot;,&#xA;    &quot;File name&quot;: &quot;AUHF-T9ZV.nc&quot;,&#xA;    &quot;Represents DOI&quot;: &quot;https://doi.org/10.48597/AUHF-T9ZV&quot;,&#xA;    &quot;Contains data from DOI&quot;: &quot;https://doi.org/10.48597/AUHF-T9ZV&quot;,&#xA;    &quot;File creation&quot;: &quot;2023-12-18T20:47:33.150673 UTC&quot;,&#xA;    &quot;Export state&quot;: &quot;2020-06-18T18:09:37.813000 UTC&quot;,&#xA;    &quot;Export filter&quot;: &quot;exclude-900,exclude-invalid&quot;,&#xA;    &quot;Startdate&quot;: &quot;20170101000000&quot;,&#xA;    &quot;Revision date&quot;: &quot;20200528000000&quot;,&#xA;    &quot;Version&quot;: &quot;1&quot;,&#xA;    &quot;Version description&quot;: &quot;initial revision&quot;,&#xA;    &quot;Data level&quot;: &quot;2&quot;,&#xA;    &quot;Period code&quot;: &quot;3y&quot;,&#xA;    &quot;Resolution code&quot;: &quot;1h&quot;,&#xA;    &quot;Sample duration&quot;: &quot;1h&quot;,&#xA;    &quot;Orig. time res.&quot;: &quot;270s&quot;,&#xA;    &quot;Station code&quot;: &quot;ES0021U&quot;,&#xA;    &quot;Platform code&quot;: &quot;ES0021S&quot;,&#xA;    &quot;Station name&quot;: &quot;Madrid&quot;,&#xA;    &quot;Station latitude&quot;: &quot;40.456436&quot;,&#xA;    &quot;Station longitude&quot;: &quot;-3.725631&quot;,&#xA;    &quot;Station altitude&quot;: &quot;669.0 m&quot;,&#xA;    &quot;Measurement latitude&quot;: &quot;40.456436&quot;,&#xA;    &quot;Measurement longitude&quot;: &quot;-3.725631&quot;,&#xA;    &quot;Measurement altitude&quot;: &quot;669.0 m&quot;,&#xA;    &quot;Measurement height&quot;: &quot;3.0 m&quot;,&#xA;    &quot;Regime&quot;: &quot;IMG&quot;,&#xA;    &quot;Laboratory code&quot;: &quot;ES09L&quot;,&#xA;    &quot;Instrument type&quot;: &quot;smps&quot;,&#xA;    &quot;Instrument name&quot;: &quot;TSI_3936_CIE1&quot;,&#xA;    &quot;Instrument manufacturer&quot;: &quot;TSI&quot;,&#xA;    &quot;Instrument model&quot;: &quot;3936&quot;,&#xA;    &quot;Instrument serial number&quot;: &quot;70838465&quot;,&#xA;    &quot;Method ref&quot;: &quot;ES09L_smps_01_107bins&quot;,&#xA;    &quot;Standard method&quot;: &quot;SOP=Wiedensohler2012&quot;,&#xA;    &quot;Inlet type&quot;: &quot;Impactor--direct&quot;,&#xA;    &quot;Inlet description&quot;: &quot;The sampling line is a 3-m long, 1/4\&quot; diameter pipe with a weatherproof inlet to prevent rain to enter.&quot;,&#xA;    &quot;Humidity/temperature control&quot;: &quot;Nafion dryer&quot;,&#xA;    &quot;Humidity/temperature control description&quot;: &quot;sample dried to below 40% RH with nafion dryer operated with reduced pressure sheath air&quot;,&#xA;    &quot;Volume std. temperature&quot;: &quot;273.15 K&quot;,&#xA;    &quot;Volume std. pressure&quot;: &quot;1013.25 hPa&quot;,&#xA;    &quot;Measurement uncertainty expl.&quot;: &quot;This instrument participated in an MPSS intercomparison campaign at TROPOS during November 2017 and passed the quality standards of ACTRIS and GAW. It showed a concentration 1% lower than the Reference Instrument using the TROPOS evaluation software&quot;,&#xA;    &quot;Zero/negative values code&quot;: &quot;Zero possible&quot;,&#xA;    &quot;Zero/negative values&quot;: &quot;Zero values may appear due to statistical variations at very low concentrations&quot;,&#xA;    &quot;QA1 measure ID&quot;: &quot;WCCAP-MPSS-2017-6&quot;,&#xA;    &quot;QA1 date&quot;: &quot;2017-11-17 UTC&quot;,&#xA;    &quot;QA1 document URL&quot;: &quot;http://www.actris-ecac.eu/files/ECAC-report-MPSS-2017-6-1.pdf&quot;,&#xA;    &quot;Organization&quot;: &quot;ES09L, \&quot;Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Spain\&quot;, , , , , , , &quot;,&#xA;    &quot;Framework acronym&quot;: &quot;ACTRIS&quot;,&#xA;    &quot;Framework name&quot;: &quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;,&#xA;    &quot;Framework description&quot;: &quot;ACTRIS is the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases. ACTRIS is composed of observing stations, exploratory platforms, instruments calibration centres, and a data centre.&quot;,&#xA;    &quot;Framework contact name&quot;: &quot;Cathrine Lund Myhre&quot;,&#xA;    &quot;Framework contact email&quot;: &quot;clm@nilu.no&quot;,&#xA;    &quot;Originator&quot;: &quot;Artinano, Begona, b.artinano@ciemat.es, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Environment Department, Av. Complutense 40, , E-28040, Madrid, Spain&quot;,&#xA;    &quot;Submitter&quot;: &quot;Martin, Laura, laura.martin@ciemat.es, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Environment Department, Av. Complutense 40, , E-28040, Madrid, Spain&quot;,&#xA;    &quot;Acknowledgement&quot;: &quot;Request acknowledgement details from data originator&quot;,&#xA;    &quot;Comment&quot;: &quot;The system was checked for sample and sheath flows and high-voltage supply in a regular base. In addition, some latex calibrations were performed along the year to check the correct whole instrument operation.&quot;&#xA;}" />
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    <attribute name="ebas_measurement_altitude" value="669.0 m" />
    <attribute name="ebas_measurement_height" value="3.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="pressure" />
    <attribute name="ebas_unit" value="hPa" />
    <attribute name="ebas_matrix" value="instrument" />
    <attribute name="ebas_laboratory_code" value="ES09L" />
    <attribute name="ebas_instrument_type" value="smps" />
    <attribute name="ebas_instrument_name" value="TSI_3936_CIE1" />
    <attribute name="ebas_instrument_manufacturer" value="TSI" />
    <attribute name="ebas_instrument_model" value="3936" />
    <attribute name="ebas_instrument_serial_number" value="70838465" />
    <attribute name="ebas_method_ref" value="ES09L_smps_01_107bins" />
    <attribute name="ebas_standard_method" value="SOP=Wiedensohler2012" />
    <attribute name="ebas_inlet_type" value="Impactor--direct" />
    <attribute name="ebas_inlet_description" value="The sampling line is a 3-m long, 1/4&quot; diameter pipe with a weatherproof inlet to prevent rain to enter." />
    <attribute name="ebas_humidity_temperaure_control" value="Nafion dryer" />
    <attribute name="ebas_humidity_temperaure_control_description" value="sample dried to below 40% RH with nafion dryer operated with reduced pressure sheath air" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_measurement_uncertainty_expl" value="This instrument participated in an MPSS intercomparison campaign at TROPOS during November 2017 and passed the quality standards of ACTRIS and GAW. It showed a concentration 1% lower than the Reference Instrument using the TROPOS evaluation software" />
    <attribute name="ebas_zero_negative_values_code" value="Zero possible" />
    <attribute name="ebas_zero_negative_values" value="Zero values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="ES09L, &quot;Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Spain&quot;, , , , , , , " />
    <attribute name="ebas_framework_acronym" value="ACTRIS" />
    <attribute name="ebas_framework_name" value="European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases" />
    <attribute name="ebas_framework_description" value="ACTRIS is the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases. ACTRIS is composed of observing stations, exploratory platforms, instruments calibration centres, and a data centre." />
    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no" />
    <attribute name="ebas_submitter" value="Martin, Laura, laura.martin@ciemat.es, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Environment Department, Av. Complutense 40, , E-28040, Madrid, Spain" />
    <attribute name="ebas_acknowledgement" value="Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="The system was checked for sample and sheath flows and high-voltage supply in a regular base. In addition, some latex calibrations were performed along the year to check the correct whole instrument operation." />
  </variable>
  <variable name="pressure_qc" shape="pressure_qc_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="pressure_ebasmetadata" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="relative_humidity" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="relative_humidity" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="%" />
    <attribute name="ancillary_variables" value="relative_humidity_qc relative_humidity_ebasmetadata" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="20200528000000" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="270s" />
    <attribute name="ebas_station_code" value="ES0021U" />
    <attribute name="ebas_platform_code" value="ES0021S" />
    <attribute name="ebas_station_name" value="Madrid" />
    <attribute name="ebas_station_latitude" value="40.456436" />
    <attribute name="ebas_station_longitude" value="-3.725631" />
    <attribute name="ebas_station_altitude" value="669.0 m" />
    <attribute name="ebas_measuremenet_latitude" value="40.456436" />
    <attribute name="ebas_measurement_longitude" value="-3.725631" />
    <attribute name="ebas_measurement_altitude" value="669.0 m" />
    <attribute name="ebas_measurement_height" value="3.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="relative_humidity" />
    <attribute name="ebas_unit" value="%" />
    <attribute name="ebas_matrix" value="instrument" />
    <attribute name="ebas_laboratory_code" value="ES09L" />
    <attribute name="ebas_instrument_type" value="smps" />
    <attribute name="ebas_instrument_name" value="TSI_3936_CIE1" />
    <attribute name="ebas_instrument_manufacturer" value="TSI" />
    <attribute name="ebas_instrument_model" value="3936" />
    <attribute name="ebas_instrument_serial_number" value="70838465" />
    <attribute name="ebas_method_ref" value="ES09L_smps_01_107bins" />
    <attribute name="ebas_standard_method" value="SOP=Wiedensohler2012" />
    <attribute name="ebas_inlet_type" value="Impactor--direct" />
    <attribute name="ebas_inlet_description" value="The sampling line is a 3-m long, 1/4&quot; diameter pipe with a weatherproof inlet to prevent rain to enter." />
    <attribute name="ebas_humidity_temperaure_control" value="Nafion dryer" />
    <attribute name="ebas_humidity_temperaure_control_description" value="sample dried to below 40% RH with nafion dryer operated with reduced pressure sheath air" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_measurement_uncertainty_expl" value="This instrument participated in an MPSS intercomparison campaign at TROPOS during November 2017 and passed the quality standards of ACTRIS and GAW. It showed a concentration 1% lower than the Reference Instrument using the TROPOS evaluation software" />
    <attribute name="ebas_zero_negative_values_code" value="Zero possible" />
    <attribute name="ebas_zero_negative_values" value="Zero values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="ES09L, &quot;Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Spain&quot;, , , , , , , " />
    <attribute name="ebas_framework_acronym" value="ACTRIS" />
    <attribute name="ebas_framework_name" value="European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases" />
    <attribute name="ebas_framework_description" value="ACTRIS is the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases. ACTRIS is composed of observing stations, exploratory platforms, instruments calibration centres, and a data centre." />
    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no" />
    <attribute name="ebas_submitter" value="Martin, Laura, laura.martin@ciemat.es, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Environment Department, Av. Complutense 40, , E-28040, Madrid, Spain" />
    <attribute name="ebas_acknowledgement" value="Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="The system was checked for sample and sheath flows and high-voltage supply in a regular base. In addition, some latex calibrations were performed along the year to check the correct whole instrument operation." />
  </variable>
  <variable name="relative_humidity_qc" shape="relative_humidity_qc_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="relative_humidity_ebasmetadata" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="temperature" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="K" />
    <attribute name="ancillary_variables" value="temperature_qc temperature_ebasmetadata" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="20200528000000" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="270s" />
    <attribute name="ebas_station_code" value="ES0021U" />
    <attribute name="ebas_platform_code" value="ES0021S" />
    <attribute name="ebas_station_name" value="Madrid" />
    <attribute name="ebas_station_latitude" value="40.456436" />
    <attribute name="ebas_station_longitude" value="-3.725631" />
    <attribute name="ebas_station_altitude" value="669.0 m" />
    <attribute name="ebas_measuremenet_latitude" value="40.456436" />
    <attribute name="ebas_measurement_longitude" value="-3.725631" />
    <attribute name="ebas_measurement_altitude" value="669.0 m" />
    <attribute name="ebas_measurement_height" value="3.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="temperature" />
    <attribute name="ebas_unit" value="K" />
    <attribute name="ebas_matrix" value="instrument" />
    <attribute name="ebas_laboratory_code" value="ES09L" />
    <attribute name="ebas_instrument_type" value="smps" />
    <attribute name="ebas_instrument_name" value="TSI_3936_CIE1" />
    <attribute name="ebas_instrument_manufacturer" value="TSI" />
    <attribute name="ebas_instrument_model" value="3936" />
    <attribute name="ebas_instrument_serial_number" value="70838465" />
    <attribute name="ebas_method_ref" value="ES09L_smps_01_107bins" />
    <attribute name="ebas_standard_method" value="SOP=Wiedensohler2012" />
    <attribute name="ebas_inlet_type" value="Impactor--direct" />
    <attribute name="ebas_inlet_description" value="The sampling line is a 3-m long, 1/4&quot; diameter pipe with a weatherproof inlet to prevent rain to enter." />
    <attribute name="ebas_humidity_temperaure_control" value="Nafion dryer" />
    <attribute name="ebas_humidity_temperaure_control_description" value="sample dried to below 40% RH with nafion dryer operated with reduced pressure sheath air" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_measurement_uncertainty_expl" value="This instrument participated in an MPSS intercomparison campaign at TROPOS during November 2017 and passed the quality standards of ACTRIS and GAW. It showed a concentration 1% lower than the Reference Instrument using the TROPOS evaluation software" />
    <attribute name="ebas_zero_negative_values_code" value="Zero possible" />
    <attribute name="ebas_zero_negative_values" value="Zero values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="ES09L, &quot;Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Spain&quot;, , , , , , , " />
    <attribute name="ebas_framework_acronym" value="ACTRIS" />
    <attribute name="ebas_framework_name" value="European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases" />
    <attribute name="ebas_framework_description" value="ACTRIS is the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases. ACTRIS is composed of observing stations, exploratory platforms, instruments calibration centres, and a data centre." />
    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no" />
    <attribute name="ebas_submitter" value="Martin, Laura, laura.martin@ciemat.es, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Environment Department, Av. Complutense 40, , E-28040, Madrid, Spain" />
    <attribute name="ebas_acknowledgement" value="Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="The system was checked for sample and sheath flows and high-voltage supply in a regular base. In addition, some latex calibrations were performed along the year to check the correct whole instrument operation." />
  </variable>
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    <attribute name="standard_name" value="status_flag" />
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    <attribute name="units" value="1" />
  </variable>
  <variable name="temperature_ebasmetadata" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="particle_number_size_distribution_amean_0" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="number_concentration_of_positive_ions_in_dry_aerosol_particles_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="1/cm3" />
    <attribute name="ancillary_variables" value="particle_number_size_distribution_amean_0_qc particle_number_size_distribution_amean_0_ebasmetadata" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="20200528000000" />
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    <attribute name="ebas_version_description" value="initial revision" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
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    <attribute name="ebas_orig_time_res" value="270s" />
    <attribute name="ebas_station_code" value="ES0021U" />
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    <attribute name="ebas_station_name" value="Madrid" />
    <attribute name="ebas_station_latitude" value="40.456436" />
    <attribute name="ebas_station_longitude" value="-3.725631" />
    <attribute name="ebas_station_altitude" value="669.0 m" />
    <attribute name="ebas_measuremenet_latitude" value="40.456436" />
    <attribute name="ebas_measurement_longitude" value="-3.725631" />
    <attribute name="ebas_measurement_altitude" value="669.0 m" />
    <attribute name="ebas_measurement_height" value="3.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="particle_number_size_distribution" />
    <attribute name="ebas_unit" value="1/cm3" />
    <attribute name="ebas_matrix" value="aerosol" />
    <attribute name="ebas_laboratory_code" value="ES09L" />
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    <attribute name="ebas_instrument_manufacturer" value="TSI" />
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    <attribute name="ebas_instrument_serial_number" value="70838465" />
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    <attribute name="ebas_inlet_type" value="Impactor--direct" />
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    <attribute name="ebas_measurement_uncertainty" value="10.0 %" />
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    <attribute name="ebas_zero_negative_values_code" value="Zero possible" />
    <attribute name="ebas_zero_negative_values" value="Zero values may appear due to statistical variations at very low concentrations" />
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    <attribute name="ebas_framework_name" value="European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases" />
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    <attribute name="ebas_submitter" value="Martin, Laura, laura.martin@ciemat.es, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Environment Department, Av. Complutense 40, , E-28040, Madrid, Spain" />
    <attribute name="ebas_acknowledgement" value="Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="The system was checked for sample and sheath flows and high-voltage supply in a regular base. In addition, some latex calibrations were performed along the year to check the correct whole instrument operation." />
  </variable>
  <variable name="particle_number_size_distribution_amean_0_qc" shape="particle_number_size_distribution_amean_0_qc_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
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    <attribute name="units" value="1" />
  </variable>
  <variable name="particle_number_size_distribution_amean_0_ebasmetadata" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="particle_number_size_distribution_amean_1" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="number_concentration_of_positive_ions_in_dry_aerosol_particles_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="1/cm3" />
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    <attribute name="cell_methods" value="time: mean" />
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    <attribute name="ebas_revision_date" value="20200528000000" />
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    <attribute name="ebas_version_description" value="initial revision" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="270s" />
    <attribute name="ebas_station_code" value="ES0021U" />
    <attribute name="ebas_platform_code" value="ES0021S" />
    <attribute name="ebas_station_name" value="Madrid" />
    <attribute name="ebas_station_latitude" value="40.456436" />
    <attribute name="ebas_station_longitude" value="-3.725631" />
    <attribute name="ebas_station_altitude" value="669.0 m" />
    <attribute name="ebas_measuremenet_latitude" value="40.456436" />
    <attribute name="ebas_measurement_longitude" value="-3.725631" />
    <attribute name="ebas_measurement_altitude" value="669.0 m" />
    <attribute name="ebas_measurement_height" value="3.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="particle_number_size_distribution" />
    <attribute name="ebas_unit" value="1/cm3" />
    <attribute name="ebas_matrix" value="aerosol" />
    <attribute name="ebas_laboratory_code" value="ES09L" />
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    <attribute name="ebas_instrument_name" value="TSI_3936_CIE1" />
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    <attribute name="ebas_instrument_serial_number" value="70838465" />
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    <attribute name="ebas_inlet_type" value="Impactor--direct" />
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    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
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    <attribute name="ebas_detection_limit_expl" value="Determined only by instrument counting statistics, no detection limit flag used" />
    <attribute name="ebas_measurement_uncertainty" value="10.0 %" />
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    <attribute name="ebas_zero_negative_values_code" value="Zero possible" />
    <attribute name="ebas_zero_negative_values" value="Zero values may appear due to statistical variations at very low concentrations" />
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    <attribute name="ebas_framework_name" value="European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases" />
    <attribute name="ebas_framework_description" value="ACTRIS is the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases. ACTRIS is composed of observing stations, exploratory platforms, instruments calibration centres, and a data centre." />
    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no" />
    <attribute name="ebas_submitter" value="Martin, Laura, laura.martin@ciemat.es, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Environment Department, Av. Complutense 40, , E-28040, Madrid, Spain" />
    <attribute name="ebas_acknowledgement" value="Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="The system was checked for sample and sheath flows and high-voltage supply in a regular base. In addition, some latex calibrations were performed along the year to check the correct whole instrument operation." />
  </variable>
  <variable name="particle_number_size_distribution_amean_1_qc" shape="particle_number_size_distribution_amean_1_qc_flags time" type="int">
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    <attribute name="ebas_framework_acronym" value="ACTRIS" />
    <attribute name="ebas_framework_name" value="European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases" />
    <attribute name="ebas_framework_description" value="ACTRIS is the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases. ACTRIS is composed of observing stations, exploratory platforms, instruments calibration centres, and a data centre." />
    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no" />
    <attribute name="ebas_submitter" value="Martin, Laura, laura.martin@ciemat.es, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Environment Department, Av. Complutense 40, , E-28040, Madrid, Spain" />
    <attribute name="ebas_acknowledgement" value="Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="The system was checked for sample and sheath flows and high-voltage supply in a regular base. In addition, some latex calibrations were performed along the year to check the correct whole instrument operation." />
  </variable>
  <variable name="particle_number_size_distribution_perc8413_105_qc" shape="particle_number_size_distribution_perc8413_105_qc_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="particle_number_size_distribution_perc8413_105_ebasmetadata" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="particle_number_size_distribution_perc8413_106" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="number_concentration_of_positive_ions_in_dry_aerosol_particles_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="1/cm3" />
    <attribute name="ancillary_variables" value="particle_number_size_distribution_perc8413_106_qc particle_number_size_distribution_perc8413_106_ebasmetadata" />
    <attribute name="cell_methods" value="time: percentile:84.13" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="20200528000000" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision" />
    <attribute name="ebas_statistics" value="percentile:84.13" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="270s" />
    <attribute name="ebas_station_code" value="ES0021U" />
    <attribute name="ebas_platform_code" value="ES0021S" />
    <attribute name="ebas_station_name" value="Madrid" />
    <attribute name="ebas_station_latitude" value="40.456436" />
    <attribute name="ebas_station_longitude" value="-3.725631" />
    <attribute name="ebas_station_altitude" value="669.0 m" />
    <attribute name="ebas_measuremenet_latitude" value="40.456436" />
    <attribute name="ebas_measurement_longitude" value="-3.725631" />
    <attribute name="ebas_measurement_altitude" value="669.0 m" />
    <attribute name="ebas_measurement_height" value="3.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="particle_number_size_distribution" />
    <attribute name="ebas_unit" value="1/cm3" />
    <attribute name="ebas_matrix" value="aerosol" />
    <attribute name="ebas_laboratory_code" value="ES09L" />
    <attribute name="ebas_instrument_type" value="smps" />
    <attribute name="ebas_instrument_name" value="TSI_3936_CIE1" />
    <attribute name="ebas_instrument_manufacturer" value="TSI" />
    <attribute name="ebas_instrument_model" value="3936" />
    <attribute name="ebas_instrument_serial_number" value="70838465" />
    <attribute name="ebas_method_ref" value="ES09L_smps_01_107bins" />
    <attribute name="ebas_standard_method" value="SOP=Wiedensohler2012" />
    <attribute name="ebas_inlet_type" value="Impactor--direct" />
    <attribute name="ebas_inlet_description" value="The sampling line is a 3-m long, 1/4&quot; diameter pipe with a weatherproof inlet to prevent rain to enter." />
    <attribute name="ebas_humidity_temperaure_control" value="Nafion dryer" />
    <attribute name="ebas_humidity_temperaure_control_description" value="sample dried to below 40% RH with nafion dryer operated with reduced pressure sheath air" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_detection_limit" value="0.0 1/cm3" />
    <attribute name="ebas_detection_limit_expl" value="Determined only by instrument counting statistics, no detection limit flag used" />
    <attribute name="ebas_measurement_uncertainty" value="10.0 %" />
    <attribute name="ebas_measurement_uncertainty_expl" value="This instrument participated in an MPSS intercomparison campaign at TROPOS during November 2017 and passed the quality standards of ACTRIS and GAW. It showed a concentration 1% lower than the Reference Instrument using the TROPOS evaluation software" />
    <attribute name="ebas_zero_negative_values_code" value="Zero possible" />
    <attribute name="ebas_zero_negative_values" value="Zero values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="ES09L, &quot;Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Spain&quot;, , , , , , , " />
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    <attribute name="ebas_framework_name" value="European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases" />
    <attribute name="ebas_framework_description" value="ACTRIS is the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases. ACTRIS is composed of observing stations, exploratory platforms, instruments calibration centres, and a data centre." />
    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no" />
    <attribute name="ebas_submitter" value="Martin, Laura, laura.martin@ciemat.es, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, CIEMAT, Environment Department, Av. Complutense 40, , E-28040, Madrid, Spain" />
    <attribute name="ebas_acknowledgement" value="Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="The system was checked for sample and sheath flows and high-voltage supply in a regular base. In addition, some latex calibrations were performed along the year to check the correct whole instrument operation." />
  </variable>
  <variable name="particle_number_size_distribution_perc8413_106_qc" shape="particle_number_size_distribution_perc8413_106_qc_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="particle_number_size_distribution_perc8413_106_ebasmetadata" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="time" shape="time" type="double">
    <attribute name="long_name" value="time of measurement" />
    <attribute name="standard_name" value="time" />
    <attribute name="units" value="days since 1900-01-01 00:00:00 UTC" />
    <attribute name="axis" value="T" />
    <attribute name="calendar" value="gregorian" />
    <attribute name="bounds" value="time_bnds" />
    <attribute name="_CoordinateAxisType" value="Time" />
  </variable>
  <variable name="metadata_time" shape="metadata_time" type="double">
    <attribute name="long_name" value="time of ebas metadata intervals" />
    <attribute name="standard_name" value="time" />
    <attribute name="units" value="days since 1900-01-01 00:00:00 UTC" />
    <attribute name="axis" value="T" />
    <attribute name="calendar" value="gregorian" />
    <attribute name="bounds" value="metadata_time_bnds" />
    <attribute name="_CoordinateAxisType" value="Time" />
  </variable>
</netcdf>
