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  <attribute name="Conventions" value="CF-1.8, ACDD-1.3" />
  <attribute name="featureType" value="timeSeries" />
  <attribute name="title" value="Pm25_mass at Birkenes II" />
  <attribute name="summary" value="Pm25_mass at Birkenes II. These measurements are gathered as a part of the following projects NILU_internal and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['pm25_mass in pm25 (mass_concentration_of_pm2p5_ambient_aerosol_particles_in_air)']" />
  <attribute name="keywords" value="&quot;Birkenes II&quot; NO0002R pm25_mass pm25 NILU_internal mass_concentration_of_pm2p5_ambient_aerosol_particles_in_air" />
  <attribute name="id" value="RK46-GT6R.nc" />
  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="NILU_internal" />
  <attribute name="acknowledgement" value="" />
  <attribute name="doi" value="https://doi.org/10.48597/RK46-GT6R" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Yttri, K., Aas, W., NILU_internal, 2017, Pm25_mass at Birkenes II, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/RK46-GT6R" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="NO01L &quot;Norwegian Institute for Air Research&quot; NILU &quot;Instituttveien 18&quot; 2007 Kjeller Norway" />
  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2017-01-19T11:33:10.870000Z" />
  <attribute name="date_metadata_modified" value="2017-01-19T00:00:00Z" />
  <attribute name="creator_name" value="Karl Espen Yttri, Wenche Aas" />
  <attribute name="creator_type" value="person" />
  <attribute name="creator_email" value="key@nilu.no, waa@nilu.no" />
  <attribute name="creator_institution" value="&quot;Norwegian Institute for Air Research, Atmosphere and Climate Department, NILU&quot;, &quot;Norwegian Institute for Air Research, Atmosphere and Climate Department, NILU&quot;" />
  <attribute name="contributor_name" value="Karl Espen Yttri" />
  <attribute name="contributor_role" value="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 (8.252 58.38853 195)" />
  <attribute name="geospatial_lat_min" type="double" value="58.38853" />
  <attribute name="geospatial_lat_max" type="double" value="58.38853" />
  <attribute name="geospatial_lon_min" type="double" value="8.252" />
  <attribute name="geospatial_lon_max" type="double" value="8.252" />
  <attribute name="geospatial_vertical_min" type="double" value="195.0" />
  <attribute name="geospatial_vertical_max" type="double" value="195.0" />
  <attribute name="geospatial_vertical_positive" value="up" />
  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
  <attribute name="time_coverage_start" value="2015-01-07T07:00:00Z" />
  <attribute name="time_coverage_end" value="2016-01-06T07:00:00Z" />
  <attribute name="time_coverage_duration" value="P0000-11-30T00:00:00" />
  <attribute name="time_coverage_resolution" value="P0000-00-07T00:00:00" />
  <attribute name="timezone" value="UTC" />
  <attribute name="ebas_data_definition" value="EBAS_1.1" />
  <attribute name="ebas_data_license" value="" />
  <attribute name="ebas_citation" value="Yttri, K., Aas, W., NILU_internal, 2017, Pm25_mass at Birkenes II, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/RK46-GT6R" />
  <attribute name="ebas_set_type_code" value="TU" />
  <attribute name="ebas_timezone" value="UTC" />
  <attribute name="ebas_file_name" value="RK46-GT6R.nc" />
  <attribute name="ebas_represents_doi" value="https://doi.org/10.48597/RK46-GT6R" />
  <attribute name="ebas_contains_doi" value="https://doi.org/10.48597/RK46-GT6R" />
  <attribute name="ebas_file_creation" value="2026-05-01T20:19:02.613703Z" />
  <attribute name="ebas_export_state" value="2017-01-19T11:33:10.870000Z" />
  <attribute name="ebas_export_filter" value="exclude-900,exclude-invalid" />
  <attribute name="ebas_startdate" value="2015-01-07T07:00:00.000000Z" />
  <attribute name="ebas_revision_date" value="2017-01-19T00:00:00.000000Z" />
  <attribute name="ebas_version" value="1" />
  <attribute name="ebas_version_description" value="initial revision, manually inspected" />
  <attribute name="ebas_statistics" value="arithmetic mean" />
  <attribute name="ebas_data_level" value="3a" />
  <attribute name="ebas_period_code" value="52w" />
  <attribute name="ebas_resolution_code" value="1w" />
  <attribute name="ebas_sample_duration" value="1w" />
  <attribute name="ebas_orig_time_res" value="1w" />
  <attribute name="ebas_station_code" value="NO0002R" />
  <attribute name="ebas_platform_code" value="NO0002S" />
  <attribute name="ebas_station_name" value="Birkenes II" />
  <attribute name="ebas_station_wdca_id" value="GAWANO__BIR" />
  <attribute name="ebas_station_gaw_id" value="BIR" />
  <attribute name="ebas_station_gaw_name" value="Birkenes Atmospheric Observatory" />
  <attribute name="ebas_station_other_ids" value="BIR (ICOS), Birkenes (AERONET)" />
  <attribute name="ebas_station_land_use" value="Forest" />
  <attribute name="ebas_station_setting" value="Rural" />
  <attribute name="ebas_station_gaw_type" value="R" />
  <attribute name="ebas_station_wmo_region" type="long" value="6" />
  <attribute name="ebas_station_latitude" type="double" value="58.38853" />
  <attribute name="ebas_station_longitude" type="double" value="8.252" />
  <attribute name="ebas_station_altitude" value="219.0 m" />
  <attribute name="ebas_measurement_altitude" value="195.0 m" />
  <attribute name="ebas_measurement_height" value="4.0 m" />
  <attribute name="ebas_regime" value="IMG" />
  <attribute name="ebas_component" value="pm25_mass" />
  <attribute name="ebas_unit" value="ug/m3" />
  <attribute name="ebas_matrix" value="pm25" />
  <attribute name="ebas_laboratory_code" value="NO01L" />
  <attribute name="ebas_instrument_type" value="low_vol_sampler" />
  <attribute name="ebas_instrument_name" value="kfg_no02_pm25" />
  <attribute name="ebas_instrument_manufacturer" value="Leckel" />
  <attribute name="ebas_instrument_model" value="LVS3" />
  <attribute name="ebas_method_ref" value="NO01L_Thermo_Optical-Sunset_Lab" />
  <attribute name="ebas_standard_method" value="None" />
  <attribute name="ebas_inlet_type" value="Hat or hood" />
  <attribute name="ebas_inlet_description" value="Upward facing" />
  <attribute name="ebas_medium" value="Quartz" />
  <attribute name="ebas_blank_correction" value="Blank corrected" />
  <attribute name="ebas_humidity_temperaure_control" value="None" />
  <attribute name="ebas_humidity_temperaure_control_description" value="filter kept at ambient conditions together with sampling head" />
  <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
  <attribute name="ebas_zero_negative_values" value="zero/negative do not occur, values below detection limit are flagged using 781" />
  <attribute name="ebas_organization" value="NO01L, Norwegian Institute for Air Research, NILU, , Instituttveien 18, , 2007, Kjeller, Norway" />
  <attribute name="ebas_framework_acronym" value="NILU_internal" />
  <attribute name="ebas_framework_name" value="NILU internal" />
  <attribute name="ebas_framework_description" value="&quot;NILU internal data, password protected, not visible to outside (hidden and test datasets)&quot;" />
  <attribute name="ebas_framework_contact_name" value="Wenche Aas" />
  <attribute name="ebas_framework_contact_email" value="waa@nilu.no" />
  <attribute name="ebas_originator" value="&quot;Yttri, Karl Espen, key@nilu.no, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway&quot;, &quot;Aas, Wenche, waa@nilu.no, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway, ORCID=0000-0002-2908-1970&quot;" />
  <attribute name="ebas_submitter" value="&quot;Yttri, Karl Espen, key@nilu.no, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway&quot;" />
  <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: NILU_internal. Request acknowledgement details from data originator" />
  <attribute name="ebas_comment" value="Analytical method as described by Dye and Yttri (2005); Subject to intercomparison (see Yttri et al., 2015); Samnples also determined for OC/EC and mass concentration" />
  <attribute name="_NCProperties" value="version=2,netcdf=4.9.3,hdf5=1.14.6" />
  <attribute name="Metadata_Conventions" value="Unidata Dataset Discovery v1.0" />
  <attribute name="geospatial_lat_units" value="degrees_north" />
  <attribute name="geospatial_lon_units" value="degrees_east" />
  <attribute name="standard_name_vocabulary" value="CF-1.7, ACDD-1.3" />
  <attribute name="history" value="None" />
  <attribute name="creator_url" value="ebas.nilu.no" />
  <attribute name="_CoordSysBuilder" value="ucar.nc2.internal.dataset.conv.CF1Convention" />
  <dimension name="time" length="52" />
  <dimension name="tbnds" length="2" />
  <dimension name="metadata_time" length="1" />
  <dimension name="qc_pm25_mass_flags" length="1" />
  <group name="CFMetadata">
    <attribute name="time_coverage_start" value="2015-01-10T19:00:00Z" />
    <attribute name="time_coverage_end" value="2016-01-02T19:00:00Z" />
    <attribute name="time_coverage_units" value="seconds" />
    <attribute name="time_coverage_resolution" value="604800.0" />
    <attribute name="time_coverage_duration" value="P0Y0M357DT0H0M0.000S" />
  </group>
  <group name="NCISOMetadata">
    <attribute name="metadata_creation" value="2026-05-17" />
    <attribute name="nciso_version" value="2.4.8" />
  </group>
  <variable name="time_bnds" shape="time tbnds" type="double">
    <attribute name="long_name" value="time bounds for measurement" />
  </variable>
  <variable name="metadata_time_bnds" shape="metadata_time tbnds" type="double">
    <attribute name="long_name" value="time bounds for ebas metadata intervals" />
  </variable>
  <variable name="v_pm25_mass" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_pm2p5_ambient_aerosol_particles_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="ug/m3" />
    <attribute name="ancillary_variables" value="v_pm25_mass_qc v_pm25_mass_ebasmetadata" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="" />
    <attribute name="ebas_revision_date" value="2017-01-19T00:00:00.000000Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="3a" />
    <attribute name="ebas_sample_duration" value="1w" />
    <attribute name="ebas_orig_time_res" value="1w" />
    <attribute name="ebas_station_code" value="NO0002R" />
    <attribute name="ebas_platform_code" value="NO0002S" />
    <attribute name="ebas_station_name" value="Birkenes II" />
    <attribute name="ebas_station_wdca_id" value="GAWANO__BIR" />
    <attribute name="ebas_station_gaw_id" value="BIR" />
    <attribute name="ebas_station_gaw_name" value="Birkenes Atmospheric Observatory" />
    <attribute name="ebas_station_other_ids" value="BIR (ICOS), Birkenes (AERONET)" />
    <attribute name="ebas_station_land_use" value="Forest" />
    <attribute name="ebas_station_setting" value="Rural" />
    <attribute name="ebas_station_gaw_type" value="R" />
    <attribute name="ebas_station_wmo_region" type="long" value="6" />
    <attribute name="ebas_station_latitude" type="double" value="58.38853" />
    <attribute name="ebas_station_longitude" type="double" value="8.252" />
    <attribute name="ebas_station_altitude" value="219.0 m" />
    <attribute name="ebas_measurement_altitude" value="195.0 m" />
    <attribute name="ebas_measurement_height" value="4.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="pm25_mass" />
    <attribute name="ebas_unit" value="ug/m3" />
    <attribute name="ebas_matrix" value="pm25" />
    <attribute name="ebas_laboratory_code" value="NO01L" />
    <attribute name="ebas_instrument_type" value="low_vol_sampler" />
    <attribute name="ebas_instrument_name" value="kfg_no02_pm25" />
    <attribute name="ebas_instrument_manufacturer" value="Leckel" />
    <attribute name="ebas_instrument_model" value="LVS3" />
    <attribute name="ebas_method_ref" value="NO01L_Thermo_Optical-Sunset_Lab" />
    <attribute name="ebas_standard_method" value="None" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Upward facing" />
    <attribute name="ebas_medium" value="Quartz" />
    <attribute name="ebas_blank_correction" value="Blank corrected" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="filter kept at ambient conditions together with sampling head" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="zero/negative do not occur, values below detection limit are flagged using 781" />
    <attribute name="ebas_organization" value="NO01L, Norwegian Institute for Air Research, NILU, , Instituttveien 18, , 2007, Kjeller, Norway" />
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    <attribute name="ebas_framework_name" value="NILU internal" />
    <attribute name="ebas_framework_description" value="&quot;NILU internal data, password protected, not visible to outside (hidden and test datasets)&quot;" />
    <attribute name="ebas_framework_contact_name" value="Wenche Aas" />
    <attribute name="ebas_framework_contact_email" value="waa@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Yttri, Karl Espen, key@nilu.no, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway&quot;, &quot;Aas, Wenche, waa@nilu.no, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway, ORCID=0000-0002-2908-1970&quot;" />
    <attribute name="ebas_submitter" value="&quot;Yttri, Karl Espen, key@nilu.no, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: NILU_internal. Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="Analytical method as described by Dye and Yttri (2005); Subject to intercomparison (see Yttri et al., 2015); Samnples also determined for OC/EC and mass concentration" />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/aerosolparticlemassconcentration" />
    <attribute name="actris_variable_preferred_term" value="aerosol particle mass concentration" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/PM2.5" />
    <attribute name="actris_matrix_preferred_term" value="PM2.5" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/lowvolumesampler" />
    <attribute name="actris_instrument_type_preferred_term" value="low volume sampler" />
    <attribute name="actris_framework_uri" value="https://vocabulary.actris.nilu.no/actris_controlled_lists/NILU" />
    <attribute name="actris_framework_preferred_term" value="NILU" />
    <attribute name="actris_temporal_resolution" value="P7D" />
    <attribute name="actris_access_restriction" type="long" value="1" />
  </variable>
  <variable name="qc_pm25_mass" shape="qc_pm25_mass_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" />
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  <variable name="meta_pm25_mass" 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 1900-01-01T00:00:00Z" />
    <attribute name="axis" value="T" />
    <attribute name="calendar" value="standard" />
    <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 1900-01-01T00:00:00Z" />
    <attribute name="axis" value="T" />
    <attribute name="calendar" value="standard" />
    <attribute name="bounds" value="metadata_time_bnds" />
    <attribute name="_CoordinateAxisType" value="Time" />
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