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  <attribute name="title" value="Ground based in situ observations of aerosol_absorption_coefficient at Pha Din (VN0001R) using filter_absorption_photometer" />
  <attribute name="keywords" value="aerosol, GAW-WDCA, volume_absorption_coefficient_in_air_due_to_dried_aerosol_particles, Pha Din, VN0001R, aerosol_absorption_coefficient" />
  <attribute name="id" value="MY53-WF6V.nc" />
  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="GAW-WDCA" />
  <attribute name="acknowledgement" value="Project CATCOS, Request acknowledgement details from data originator and prinicipal investigator." />
  <attribute name="doi" value="https://doi.org/10.48597/MY53-WF6V" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Nicolas Bukowiecki, Nhat Anh Nguyen, Nicolas Bukowiecki, Nhat Anh Nguyen, aerosol_absorption_coefficient - filter_absorption_photometer at Pha Din, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/MY53-WF6V" />
  <attribute name="summary" value="Ground based in situ observations of aerosol_absorption_coefficient at Pha Din (VN0001R) using filter_absorption_photometer. These measurements are gathered as a part of the following projects GAW-WDCA and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: aerosol_absorption_coefficient in aerosol (volume_absorption_coefficient_in_air_due_to_dried_aerosol_particles), aerosol_absorption_coefficient in aerosol (volume_absorption_coefficient_in_air_due_to_dried_aerosol_particles), aerosol_absorption_coefficient in aerosol (volume_absorption_coefficient_in_air_due_to_dried_aerosol_particles)" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="CH02L, Paul Scherrer Institut, PSI, Laboratory of Atmospheric Chemistry (LAC), OFLB, 5232, Villigen PSI, Switzerland" />
  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2017-10-27T12:44:32 UTC" />
  <attribute name="date_metadata_modified" value="2017-10-27T12:44:32 UTC" />
  <attribute name="creator_name" value="Nicolas Bukowiecki, Nhat Anh Nguyen, Nicolas Bukowiecki, Nhat Anh Nguyen" />
  <attribute name="creator_type" value="person" />
  <attribute name="creator_email" value=", anhnnhn@gmail.com, , anhnnhn@gmail.com" />
  <attribute name="creator_institution" value=", &quot;Hydro-Meteorological and Environmental Station Network Center, HYMENET&quot;, , &quot;Hydro-Meteorological and Environmental Station Network Center, HYMENET&quot;" />
  <attribute name="contributor_name" value="Nhat Anh Nguyen, Nhat Anh Nguyen" />
  <attribute name="contributor_role" value="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 (21.5731 103.5157 1466.0)" />
  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
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  <attribute name="time_coverage_start" value="2015-01-01T00:00:00 UTC" />
  <attribute name="time_coverage_end" value="2017-01-01T00:00:00 UTC" />
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  <attribute name="ebas_citation" value="Nicolas Bukowiecki, Nhat Anh Nguyen, Nicolas Bukowiecki, Nhat Anh Nguyen, aerosol_absorption_coefficient - filter_absorption_photometer at Pha Din, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/MY53-WF6V" />
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  <attribute name="ebas_version_description" value="Version numbering not tracked, generated by data.aggregate.ebas r4437" />
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  <attribute name="ebas_period_code" value="2y" />
  <attribute name="ebas_resolution_code" value="1h" />
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  <attribute name="ebas_orig_time_res" value="1mn" />
  <attribute name="ebas_station_code" value="VN0001R" />
  <attribute name="ebas_platform_code" value="VN0001S" />
  <attribute name="ebas_station_name" value="Pha Din" />
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  <attribute name="ebas_station_gaw_id" value="PDI" />
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  <attribute name="ebas_station_land_use" value="Forest" />
  <attribute name="ebas_station_setting" value="Mountain" />
  <attribute name="ebas_station_gaw_type" value="R" />
  <attribute name="ebas_station_wmo_region" value="2" />
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  <attribute name="ebas_station_altitude" value="1466.0 m" />
  <attribute name="ebas_measurement_height" value="12.0 m" />
  <attribute name="ebas_regime" value="IMG" />
  <attribute name="ebas_component" value="aerosol_absorption_coefficient" />
  <attribute name="ebas_unit" value="1/Mm" />
  <attribute name="ebas_matrix" value="aerosol" />
  <attribute name="ebas_laboratory_code" value="VN01L" />
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  <attribute name="ebas_instrument_name" value="Magee_AE31_PDI_dry" />
  <attribute name="ebas_instrument_manufacturer" value="Magee" />
  <attribute name="ebas_instrument_model" value="AE31" />
  <attribute name="ebas_instrument_serial_number" value="1145_1201" />
  <attribute name="ebas_method_ref" value="VN01L_aethalometer" />
  <attribute name="ebas_standard_method" value="SOP=GAW227" />
  <attribute name="ebas_inlet_type" value="Hat or hood" />
  <attribute name="ebas_humidity_temperaure_control" value="Other (see metadata)" />
  <attribute name="ebas_humidity_temperaure_control_description" value="Dilution with dry compressed 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="5.0 1/Mm" />
  <attribute name="ebas_detection_limit_expl" value="Determined by instrument noise characteristics, no detection limit flag used" />
  <attribute name="ebas_measurement_uncertainty_expl" value="Intercomparisons with thermo-optical analysis have shown an uncertainty of a faktor 2 regardless specific absorption cross-section assumed." />
  <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
  <attribute name="ebas_organization" value="CH02L, Paul Scherrer Institut, PSI, Laboratory of Atmospheric Chemistry (LAC), OFLB, , 5232, Villigen PSI, Switzerland" />
  <attribute name="ebas_framework_acronym" value="GAW-WDCA" />
  <attribute name="ebas_framework_name" value="World Data Centre for Aerosols" />
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  <attribute name="ebas_framework_contact_name" value="Markus Fiebig" />
  <attribute name="ebas_framework_contact_email" value="Markus.Fiebig@nilu.no" />
  <attribute name="ebas_originator" value="Nguyen, Nhat Anh, anhnnhn@gmail.com, Hydro-Meteorological and Environmental Station Network Center, HYMENET, , 62 Nguyen Chi Thanh Str., , , Hanoi, Viet Nam" />
  <attribute name="ebas_submitter" value="Nguyen, Nhat Anh, anhnnhn@gmail.com, Hydro-Meteorological and Environmental Station Network Center, HYMENET, , 62 Nguyen Chi Thanh Str., , , Hanoi, Viet Nam" />
  <attribute name="ebas_acknowledgement" value="Project CATCOS, Request acknowledgement details from data originator and prinicipal investigator." />
  <attribute name="ebas_comment" value="calibration factor / mean ratio=1.0; sample_spot_area=5.0e-5 m2" />
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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;Nicolas Bukowiecki, Nhat Anh Nguyen, Nicolas Bukowiecki, Nhat Anh Nguyen, aerosol_absorption_coefficient - filter_absorption_photometer at Pha Din, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/MY53-WF6V&quot;,&#xA;    &quot;Set type code&quot;: &quot;TU&quot;,&#xA;    &quot;Timezone&quot;: &quot;UTC&quot;,&#xA;    &quot;File name&quot;: &quot;MY53-WF6V.nc&quot;,&#xA;    &quot;Represents DOI&quot;: &quot;https://doi.org/10.48597/MY53-WF6V&quot;,&#xA;    &quot;Contains data from DOI&quot;: &quot;https://doi.org/10.48597/MY53-WF6V&quot;,&#xA;    &quot;File creation&quot;: &quot;2023-12-13T10:12:25.679425 UTC&quot;,&#xA;    &quot;Export state&quot;: &quot;2017-10-27T12:44:32.543000 UTC&quot;,&#xA;    &quot;Export filter&quot;: &quot;exclude-900,exclude-invalid&quot;,&#xA;    &quot;Startdate&quot;: &quot;20150101000000&quot;,&#xA;    &quot;Revision date&quot;: &quot;20171027124432&quot;,&#xA;    &quot;Version&quot;: &quot;1&quot;,&#xA;    &quot;Version description&quot;: &quot;Version numbering not tracked, generated by data.aggregate.ebas r4437&quot;,&#xA;    &quot;Data level&quot;: &quot;2&quot;,&#xA;    &quot;Period code&quot;: &quot;2y&quot;,&#xA;    &quot;Resolution code&quot;: &quot;1h&quot;,&#xA;    &quot;Sample duration&quot;: &quot;1h&quot;,&#xA;    &quot;Orig. time res.&quot;: &quot;1mn&quot;,&#xA;    &quot;Station code&quot;: &quot;VN0001R&quot;,&#xA;    &quot;Platform code&quot;: &quot;VN0001S&quot;,&#xA;    &quot;Station name&quot;: &quot;Pha Din&quot;,&#xA;    &quot;Station WDCA-ID&quot;: &quot;GAWAID__PDI&quot;,&#xA;    &quot;Station GAW-ID&quot;: &quot;PDI&quot;,&#xA;    &quot;Station GAW-Name&quot;: &quot;Pha Din&quot;,&#xA;    &quot;Station land use&quot;: &quot;Forest&quot;,&#xA;    &quot;Station setting&quot;: &quot;Mountain&quot;,&#xA;    &quot;Station GAW type&quot;: &quot;R&quot;,&#xA;    &quot;Station WMO region&quot;: &quot;2&quot;,&#xA;    &quot;Station latitude&quot;: &quot;21.5731&quot;,&#xA;    &quot;Station longitude&quot;: &quot;103.5157&quot;,&#xA;    &quot;Station altitude&quot;: &quot;1466.0 m&quot;,&#xA;    &quot;Measurement height&quot;: &quot;12.0 m&quot;,&#xA;    &quot;Regime&quot;: &quot;IMG&quot;,&#xA;    &quot;Component&quot;: &quot;aerosol_absorption_coefficient&quot;,&#xA;    &quot;Unit&quot;: &quot;1/Mm&quot;,&#xA;    &quot;Matrix&quot;: &quot;aerosol&quot;,&#xA;    &quot;Laboratory code&quot;: &quot;VN01L&quot;,&#xA;    &quot;Instrument type&quot;: &quot;filter_absorption_photometer&quot;,&#xA;    &quot;Instrument name&quot;: &quot;Magee_AE31_PDI_dry&quot;,&#xA;    &quot;Instrument manufacturer&quot;: &quot;Magee&quot;,&#xA;    &quot;Instrument model&quot;: &quot;AE31&quot;,&#xA;    &quot;Instrument serial number&quot;: &quot;1145_1201&quot;,&#xA;    &quot;Method ref&quot;: &quot;VN01L_aethalometer&quot;,&#xA;    &quot;Standard method&quot;: &quot;SOP=GAW227&quot;,&#xA;    &quot;Inlet type&quot;: &quot;Hat or hood&quot;,&#xA;    &quot;Humidity/temperature control&quot;: &quot;Other (see metadata)&quot;,&#xA;    &quot;Humidity/temperature control description&quot;: &quot;Dilution with dry compressed 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;Detection limit&quot;: &quot;5.0 1/Mm&quot;,&#xA;    &quot;Detection limit expl.&quot;: &quot;Determined by instrument noise characteristics, no detection limit flag used&quot;,&#xA;    &quot;Measurement uncertainty expl.&quot;: &quot;Intercomparisons with thermo-optical analysis have shown an uncertainty of a faktor 2 regardless specific absorption cross-section assumed.&quot;,&#xA;    &quot;Zero/negative values&quot;: &quot;Zero and neg. values may appear due to statistical variations at very low concentrations&quot;,&#xA;    &quot;Organization&quot;: &quot;CH02L, Paul Scherrer Institut, PSI, Laboratory of Atmospheric Chemistry (LAC), OFLB, , 5232, Villigen PSI, Switzerland&quot;,&#xA;    &quot;Framework acronym&quot;: &quot;GAW-WDCA&quot;,&#xA;    &quot;Framework name&quot;: &quot;World Data Centre for Aerosols&quot;,&#xA;    &quot;Framework description&quot;: &quot;The World Data Centre for Aerosols is the data repository and archive for microphysical, optical, and chemical properties of atmospheric aerosol of the World Meteorological Organisation's (WMO) Global Atmosphere Watch (GAW) programme.&quot;,&#xA;    &quot;Framework contact name&quot;: &quot;Markus Fiebig&quot;,&#xA;    &quot;Framework contact email&quot;: &quot;Markus.Fiebig@nilu.no&quot;,&#xA;    &quot;Originator&quot;: &quot;Nguyen, Nhat Anh, anhnnhn@gmail.com, Hydro-Meteorological and Environmental Station Network Center, HYMENET, , 62 Nguyen Chi Thanh Str., , , Hanoi, Viet Nam&quot;,&#xA;    &quot;Submitter&quot;: &quot;Nguyen, Nhat Anh, anhnnhn@gmail.com, Hydro-Meteorological and Environmental Station Network Center, HYMENET, , 62 Nguyen Chi Thanh Str., , , Hanoi, Viet Nam&quot;,&#xA;    &quot;Acknowledgement&quot;: &quot;Project CATCOS, Request acknowledgement details from data originator and prinicipal investigator.&quot;,&#xA;    &quot;Comment&quot;: &quot;calibration factor / mean ratio=1.0; sample_spot_area=5.0e-5 m2&quot;&#xA;}" />
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    <attribute name="ebas_station_longitude" value="103.5157" />
    <attribute name="ebas_station_altitude" value="1466.0 m" />
    <attribute name="ebas_measurement_height" value="12.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="aerosol_absorption_coefficient" />
    <attribute name="ebas_unit" value="1/Mm" />
    <attribute name="ebas_matrix" value="aerosol" />
    <attribute name="ebas_laboratory_code" value="VN01L" />
    <attribute name="ebas_instrument_type" value="filter_absorption_photometer" />
    <attribute name="ebas_instrument_name" value="Magee_AE31_PDI_dry" />
    <attribute name="ebas_instrument_manufacturer" value="Magee" />
    <attribute name="ebas_instrument_model" value="AE31" />
    <attribute name="ebas_instrument_serial_number" value="1145_1201" />
    <attribute name="ebas_method_ref" value="VN01L_aethalometer" />
    <attribute name="ebas_standard_method" value="SOP=GAW227" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_humidity_temperaure_control" value="Other (see metadata)" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Dilution with dry compressed 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="5.0 1/Mm" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument noise characteristics, no detection limit flag used" />
    <attribute name="ebas_measurement_uncertainty_expl" value="Intercomparisons with thermo-optical analysis have shown an uncertainty of a faktor 2 regardless specific absorption cross-section assumed." />
    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
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    <attribute name="ebas_framework_acronym" value="GAW-WDCA" />
    <attribute name="ebas_framework_name" value="World Data Centre for Aerosols" />
    <attribute name="ebas_framework_description" value="The World Data Centre for Aerosols is the data repository and archive for microphysical, optical, and chemical properties of atmospheric aerosol of the World Meteorological Organisation's (WMO) Global Atmosphere Watch (GAW) programme." />
    <attribute name="ebas_framework_contact_name" value="Markus Fiebig" />
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    <attribute name="ebas_comment" value="calibration factor / mean ratio=1.0; sample_spot_area=5.0e-5 m2" />
  </variable>
  <variable name="aerosol_absorption_coefficient_perc8413_5_qc" shape="aerosol_absorption_coefficient_perc8413_5_qc_flags time" type="int">
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    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
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    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="aerosol_absorption_coefficient_perc8413_6" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="volume_absorption_coefficient_in_air_due_to_dried_aerosol_particles" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="1/Mm" />
    <attribute name="ancillary_variables" value="aerosol_absorption_coefficient_perc8413_6_qc aerosol_absorption_coefficient_perc8413_6_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="20171027124432" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="Version numbering not tracked, generated by data.aggregate.ebas r4437" />
    <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="1mn" />
    <attribute name="ebas_station_code" value="VN0001R" />
    <attribute name="ebas_platform_code" value="VN0001S" />
    <attribute name="ebas_station_name" value="Pha Din" />
    <attribute name="ebas_station_wdca_id" value="GAWAID__PDI" />
    <attribute name="ebas_station_gaw_id" value="PDI" />
    <attribute name="ebas_station_gaw_name" value="Pha Din" />
    <attribute name="ebas_station_land_use" value="Forest" />
    <attribute name="ebas_station_setting" value="Mountain" />
    <attribute name="ebas_station_gaw_type" value="R" />
    <attribute name="ebas_station_wmo_region" value="2" />
    <attribute name="ebas_station_latitude" value="21.5731" />
    <attribute name="ebas_station_longitude" value="103.5157" />
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    <attribute name="ebas_instrument_manufacturer" value="Magee" />
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    <attribute name="ebas_instrument_serial_number" value="1145_1201" />
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    <attribute name="ebas_comment" value="calibration factor / mean ratio=1.0; sample_spot_area=5.0e-5 m2" />
  </variable>
  <variable name="aerosol_absorption_coefficient_perc8413_6_qc" shape="aerosol_absorption_coefficient_perc8413_6_qc_flags time" type="int">
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    <attribute name="standard_name" value="status_flag" />
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    <attribute name="units" value="1" />
  </variable>
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    <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" />
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    <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" />
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    <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>
