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  <attribute name="featureType" value="timeSeries" />
  <attribute name="title" value="Particle_number_size_distribution at South Pole" />
  <attribute name="summary" value="Particle_number_size_distribution at South Pole. These measurements are gathered as a part of the following projects GAW-WDCA, NOAA-ESRL and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['pressure in instrument', 'temperature in instrument', 'particle_number_size_distribution in pm10']" />
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  <attribute name="acknowledgement" value="" />
  <attribute name="doi" value="https://doi.org/10.48597/3H42-ND29" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Andrews, B., GAW-WDCA, NOAA-ESRL, 2026, Particle_number_size_distribution at South Pole, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/3H42-ND29" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="US06L &quot;National Oceanic and Atmospheric Administration&quot; NOAA/GML &quot;Global Monitoring Laboratory&quot; &quot;325 Broadway&quot; &quot;CO 80305-3&quot; Boulder U.S.A." />
  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2026-02-27T12:21:02.042382Z" />
  <attribute name="date_metadata_modified" value="2026-02-27T12:21:02Z" />
  <attribute name="creator_name" value="Betsy Andrews" />
  <attribute name="creator_type" value="person" />
  <attribute name="creator_email" value="betsy.andrews@noaa.gov" />
  <attribute name="creator_institution" value="&quot;National Oceanic and Atmospheric Administration/Earth System Research Laboratory/Global Monitoring Division, NOAA/ESRL/GMD&quot;" />
  <attribute name="contributor_name" value="Pasi Aalto" />
  <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/" />
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  <attribute name="geospatial_lon_max" type="double" value="-24.799999" />
  <attribute name="geospatial_vertical_min" type="double" value="2841.0" />
  <attribute name="geospatial_vertical_max" type="double" value="2841.0" />
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  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
  <attribute name="time_coverage_start" value="2023-01-01T00:00:00Z" />
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  <attribute name="timezone" value="UTC" />
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  <attribute name="ebas_citation" value="Andrews, B., GAW-WDCA, NOAA-ESRL, 2026, Particle_number_size_distribution at South Pole, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/3H42-ND29" />
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  <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_station_code" value="US6004G" />
  <attribute name="ebas_platform_code" value="US6004S" />
  <attribute name="ebas_station_name" value="South Pole" />
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  <attribute name="ebas_station_gaw_id" value="SPO" />
  <attribute name="ebas_station_gaw_name" value="South Pole" />
  <attribute name="ebas_station_land_use" value="Snowfield" />
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  <attribute name="ebas_station_longitude" type="double" value="-24.7999992371" />
  <attribute name="ebas_station_altitude" value="2841.0 m" />
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  <attribute name="ebas_measurement_longitude" type="double" value="-24.799999" />
  <attribute name="ebas_measurement_altitude" value="2841.0 m" />
  <attribute name="ebas_measurement_height" value="10.0 m" />
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  <attribute name="ebas_instrument_type" value="dmps" />
  <attribute name="ebas_instrument_name" value="UHEL_DMPS_SPO_01" />
  <attribute name="ebas_instrument_manufacturer" value="UHEL" />
  <attribute name="ebas_instrument_model" value="custom built" />
  <attribute name="ebas_instrument_serial_number" value="00001" />
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  <attribute name="ebas_inlet_type" value="Hat or hood" />
  <attribute name="ebas_humidity_temperaure_control" value="None" />
  <attribute name="ebas_humidity_temperaure_control_description" value="Not needed" />
  <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="uncertainty range between instruments in intercomparison by Wiedensohler et al. 2012." />
  <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="US06L, National Oceanic and Atmospheric Administration, NOAA/GML, Global Monitoring Laboratory, 325 Broadway, , CO 80305-3, Boulder, U.S.A." />
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  <attribute name="ebas_framework_name" value="World Data Centre for Aerosols, " />
  <attribute name="ebas_framework_description" value="&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;, " />
  <attribute name="ebas_framework_contact_name" value="Markus Fiebig, Markus Fiebig" />
  <attribute name="ebas_framework_contact_email" value="Markus.Fiebig@nilu.no, Markus.Fiebig@nilu.no" />
  <attribute name="ebas_originator" value="&quot;Andrews, Betsy, betsy.andrews@noaa.gov, National Oceanic and Atmospheric Administration/Earth System Research Laboratory/Global Monitoring Division, NOAA/ESRL/GMD, , 325 Broadway, , 80305, &quot;&quot;Boulder, CO&quot;&quot;, USA&quot;" />
  <attribute name="ebas_submitter" value="&quot;Aalto, Pasi, , , , , , , , , &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 frameworks: GAW-WDCA, NOAA-ESRL. Request acknowledgement details from data originator" />
  <attribute name="ebas_comment" value="None" />
  <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="26304" />
  <dimension name="tbnds" length="2" />
  <dimension name="metadata_time" length="3" />
  <dimension name="d_Location" length="1" />
  <dimension name="qc_pressure_flags" length="1" />
  <dimension name="qc_temperature_flags" length="1" />
  <dimension name="d_D" length="25" />
  <dimension name="qc_particle_number_size_distribution_amean_flags" length="1" />
  <dimension name="qc_particle_number_size_distribution_prec1587_flags" length="1" />
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  <group name="CFMetadata">
    <attribute name="time_coverage_start" value="2023-01-01T00:30:00Z" />
    <attribute name="time_coverage_end" value="2025-12-31T23:30:00Z" />
    <attribute name="time_coverage_units" value="seconds" />
    <attribute name="time_coverage_resolution" value="3600.0" />
    <attribute name="time_coverage_duration" value="P0Y0M1095DT23H0M0.000S" />
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  <group name="NCISOMetadata">
    <attribute name="metadata_creation" value="2026-06-05" />
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    <attribute name="long_name" value="time bounds for measurement" />
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    <attribute name="long_name" value="time bounds for ebas metadata intervals" />
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  <variable name="v_pressure" shape="d_Location time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="hPa" />
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    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-02-27T12:21:02.042382Z" />
    <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" />
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    <attribute name="ebas_station_gaw_id" value="SPO" />
    <attribute name="ebas_station_gaw_name" value="South Pole" />
    <attribute name="ebas_station_land_use" value="Snowfield" />
    <attribute name="ebas_station_setting" value="Polar" />
    <attribute name="ebas_station_gaw_type" value="G" />
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    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Not needed" />
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    <attribute name="ebas_framework_contact_name" value="Markus Fiebig, Markus Fiebig" />
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    <attribute name="ebas_station_latitude" type="double" value="-89.9969482422" />
    <attribute name="ebas_station_longitude" type="double" value="-24.7999992371" />
    <attribute name="ebas_station_altitude" value="2841.0 m" />
    <attribute name="ebas_measurement_latitude" type="double" value="-89.996948" />
    <attribute name="ebas_measurement_longitude" type="double" value="-24.799999" />
    <attribute name="ebas_measurement_altitude" value="2841.0 m" />
    <attribute name="ebas_measurement_height" value="10.0 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="pm10" />
    <attribute name="ebas_laboratory_code" value="FI03L" />
    <attribute name="ebas_instrument_type" value="dmps" />
    <attribute name="ebas_instrument_name" value="UHEL_DMPS_SPO_01" />
    <attribute name="ebas_instrument_manufacturer" value="UHEL" />
    <attribute name="ebas_instrument_model" value="custom built" />
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    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Not needed" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
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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_acronym" value="GAW-WDCA, NOAA-ESRL" />
    <attribute name="ebas_framework_name" value="World Data Centre for Aerosols, " />
    <attribute name="ebas_framework_description" value="&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;, " />
    <attribute name="ebas_framework_contact_name" value="Markus Fiebig, Markus Fiebig" />
    <attribute name="ebas_framework_contact_email" value="Markus.Fiebig@nilu.no, Markus.Fiebig@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Andrews, Betsy, betsy.andrews@noaa.gov, National Oceanic and Atmospheric Administration/Earth System Research Laboratory/Global Monitoring Division, NOAA/ESRL/GMD, , 325 Broadway, , 80305, &quot;&quot;Boulder, CO&quot;&quot;, USA&quot;" />
    <attribute name="ebas_submitter" value="&quot;Aalto, Pasi, , , , , , , , , &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 frameworks: GAW-WDCA, NOAA-ESRL. Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="None" />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/aerosolparticlenumbersizedistribution" />
    <attribute name="actris_variable_preferred_term" value="aerosol particle number size distribution" />
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    <attribute name="actris_matrix_preferred_term" value="PM10" />
    <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/mobilityparticlesizespectrometer" />
    <attribute name="actris_instrument_type_preferred_term" value="mobility particle size spectrometer" />
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    <attribute name="actris_framework_preferred_term" value="GAW-WDCA, NOAA-ESRL" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_particle_number_size_distribution_amean" shape="d_D qc_particle_number_size_distribution_amean_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="meta_particle_number_size_distribution_amean" shape="d_D metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_particle_number_size_distribution_prec1587" shape="d_D time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="1/cm3" />
    <attribute name="ancillary_variables" value="qc_particle_number_size_distribution_prec1587 meta_particle_number_size_distribution_prec1587" />
    <attribute name="cell_methods" value="time: percentile:15.87" />
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    <attribute name="ebas_revision_date" value="2026-02-27T12:21:02.042382Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision" />
    <attribute name="ebas_statistics" value="percentile:15.87" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_station_code" value="US6004G" />
    <attribute name="ebas_platform_code" value="US6004S" />
    <attribute name="ebas_station_name" value="South Pole" />
    <attribute name="ebas_station_wdca_id" value="GAWAUS__SPO" />
    <attribute name="ebas_station_gaw_id" value="SPO" />
    <attribute name="ebas_station_gaw_name" value="South Pole" />
    <attribute name="ebas_station_land_use" value="Snowfield" />
    <attribute name="ebas_station_setting" value="Polar" />
    <attribute name="ebas_station_gaw_type" value="G" />
    <attribute name="ebas_station_wmo_region" type="long" value="7" />
    <attribute name="ebas_station_latitude" type="double" value="-89.9969482422" />
    <attribute name="ebas_station_longitude" type="double" value="-24.7999992371" />
    <attribute name="ebas_station_altitude" value="2841.0 m" />
    <attribute name="ebas_measurement_latitude" type="double" value="-89.996948" />
    <attribute name="ebas_measurement_longitude" type="double" value="-24.799999" />
    <attribute name="ebas_measurement_altitude" value="2841.0 m" />
    <attribute name="ebas_measurement_height" value="10.0 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="pm10" />
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    <attribute name="ebas_instrument_type" value="dmps" />
    <attribute name="ebas_instrument_name" value="UHEL_DMPS_SPO_01" />
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    <attribute name="ebas_humidity_temperaure_control_description" value="Not needed" />
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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="World Data Centre for Aerosols, " />
    <attribute name="ebas_framework_description" value="&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;, " />
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    <attribute name="ebas_framework_contact_email" value="Markus.Fiebig@nilu.no, Markus.Fiebig@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Andrews, Betsy, betsy.andrews@noaa.gov, National Oceanic and Atmospheric Administration/Earth System Research Laboratory/Global Monitoring Division, NOAA/ESRL/GMD, , 325 Broadway, , 80305, &quot;&quot;Boulder, CO&quot;&quot;, USA&quot;" />
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    <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 frameworks: GAW-WDCA, NOAA-ESRL. Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="None" />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/aerosolparticlenumbersizedistribution" />
    <attribute name="actris_variable_preferred_term" value="aerosol particle number size distribution" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/PM10" />
    <attribute name="actris_matrix_preferred_term" value="PM10" />
    <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/mobilityparticlesizespectrometer" />
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    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
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  <variable name="qc_particle_number_size_distribution_prec1587" shape="d_D qc_particle_number_size_distribution_prec1587_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" />
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  <variable name="meta_particle_number_size_distribution_prec1587" shape="d_D metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_particle_number_size_distribution_perc8413" shape="d_D time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="1/cm3" />
    <attribute name="ancillary_variables" value="qc_particle_number_size_distribution_perc8413 meta_particle_number_size_distribution_perc8413" />
    <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="2026-02-27T12:21:02.042382Z" />
    <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" />
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    <attribute name="ebas_platform_code" value="US6004S" />
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    <attribute name="ebas_measurement_altitude" value="2841.0 m" />
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    <attribute name="ebas_component" value="particle_number_size_distribution" />
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    <attribute name="ebas_matrix" value="pm10" />
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    <attribute name="ebas_framework_description" value="&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;, " />
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    <attribute name="ebas_comment" value="None" />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/aerosolparticlenumbersizedistribution" />
    <attribute name="actris_variable_preferred_term" value="aerosol particle number size distribution" />
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    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
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    <attribute name="standard_name" value="status_flag" />
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  <variable name="meta_particle_number_size_distribution_perc8413" shape="d_D metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
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  <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" />
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  <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" />
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    <attribute name="calendar" value="standard" />
    <attribute name="bounds" value="metadata_time_bnds" />
    <attribute name="_CoordinateAxisType" value="Time" />
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  <variable name="d_Location" shape="d_Location" type="String" />
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