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  <attribute name="Conventions" value="CF-1.8, ACDD-1.3" />
  <attribute name="featureType" value="timeSeries" />
  <attribute name="title" value="Particle_number_size_distribution at BEO Moussala" />
  <attribute name="summary" value="Particle_number_size_distribution at BEO Moussala. These measurements are gathered as a part of the following projects ACTRIS, EUSAAR, GAW-WDCA and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['pressure in aerosol (air_pressure)', 'temperature in aerosol (air_temperature)', 'particle_number_size_distribution in aerosol (number_concentration_of_positive_ions_in_dry_aerosol_particles_in_air)']" />
  <attribute name="keywords" value="&quot;BEO Moussala&quot; BG0001R particle_number_size_distribution aerosol ACTRIS EUSAAR GAW-WDCA air_pressure air_temperature number_concentration_of_positive_ions_in_dry_aerosol_particles_in_air" />
  <attribute name="id" value="BTC7-HKFZ.nc" />
  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="ACTRIS, EUSAAR, GAW-WDCA" />
  <attribute name="acknowledgement" value="" />
  <attribute name="doi" value="https://doi.org/10.48597/BTC7-HKFZ" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Cristo, A., ACTRIS, EUSAAR, GAW-WDCA, 2014, Particle_number_size_distribution at BEO Moussala, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/BTC7-HKFZ" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="BG01L &quot;Institute for Nuclear Research and Nuclear Energy, Basic Environmental Observatory Moussala&quot; &quot;72 Tsarigradsko Chaussee Blvd, 1784-Sofia, Bulgaria&quot;" />
  <attribute name="date_created" value="2014-05-01T00:00:00.000000Z" />
  <attribute name="date_metadata_modified" value="2014-05-01T00:00:00Z" />
  <attribute name="creator_name" value="Angelov Cristo" />
  <attribute name="creator_type" value="person" />
  <attribute name="creator_email" value="" />
  <attribute name="creator_institution" value="" />
  <attribute name="contributor_name" value="Ivo Kalapov" />
  <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 (23.583333 42.166667 2971)" />
  <attribute name="geospatial_lat_min" type="double" value="42.166667" />
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  <attribute name="geospatial_lon_min" type="double" value="23.583333" />
  <attribute name="geospatial_lon_max" type="double" value="23.583333" />
  <attribute name="geospatial_vertical_min" type="double" value="2971.0" />
  <attribute name="geospatial_vertical_max" type="double" value="2971.0" />
  <attribute name="geospatial_vertical_positive" value="up" />
  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
  <attribute name="time_coverage_start" value="2009-01-01T00:00:00Z" />
  <attribute name="time_coverage_end" value="2011-06-01T00:00:00Z" />
  <attribute name="time_coverage_duration" value="P0002-05-00T00:00:00" />
  <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="Cristo, A., ACTRIS, EUSAAR, GAW-WDCA, 2014, Particle_number_size_distribution at BEO Moussala, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/BTC7-HKFZ" />
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  <attribute name="ebas_contains_doi" value="https://doi.org/10.48597/BTC7-HKFZ" />
  <attribute name="ebas_file_creation" value="2026-05-16T11:36:00.572752Z" />
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  <attribute name="ebas_startdate" value="2009-01-01T00:00:00.000000Z" />
  <attribute name="ebas_revision_date" value="2014-05-01T00:00:00.000000Z" />
  <attribute name="ebas_period_code" value="29mo" />
  <attribute name="ebas_resolution_code" value="1h" />
  <attribute name="ebas_station_code" value="BG0001R" />
  <attribute name="ebas_platform_code" value="BG0001S" />
  <attribute name="ebas_station_name" value="BEO Moussala" />
  <attribute name="ebas_station_latitude" type="double" value="42.166667" />
  <attribute name="ebas_station_longitude" type="double" value="23.583333" />
  <attribute name="ebas_station_altitude" value="2971.0 m" />
  <attribute name="ebas_regime" value="IMG" />
  <attribute name="ebas_matrix" value="aerosol" />
  <attribute name="ebas_laboratory_code" value="BG01L" />
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  <attribute name="ebas_instrument_name" value="SMPS_IFT" />
  <attribute name="ebas_method_ref" value="BG01L_smps_SMPS_IFT" />
  <attribute name="ebas_organization" value="BG01L, &quot;Institute for Nuclear Research and Nuclear Energy, Basic Environmental Observatory Moussala&quot;, , , &quot;72 Tsarigradsko Chaussee Blvd, 1784-Sofia, Bulgaria&quot;, , , , " />
  <attribute name="ebas_framework_acronym" value="ACTRIS, EUSAAR, GAW-WDCA" />
  <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, European Supersites for Atmospheric Aerosol Research, World Data Centre for Aerosols" />
  <attribute name="ebas_framework_description" value="&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;, &quot;Integration of measurements of atmospheric aerosol properties performed in a distributed network of 20 high quality European ground-based stations in support of policy issues on air quality, long-range transport of pollutants and climate change.&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;" />
  <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Ann Mari Fjaeraa, Markus Fiebig" />
  <attribute name="ebas_framework_contact_email" value="clm@nilu.no, amf@nilu.no, Markus.Fiebig@nilu.no" />
  <attribute name="ebas_originator" value="&quot;Cristo, Angelov, , , , , , , , , &quot;" />
  <attribute name="ebas_submitter" value="&quot;Kalapov, Ivo, , , , , , , , , &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: ACTRIS, EUSAAR, GAW-WDCA." />
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  <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="processing_level" value="processing_level_test" />
  <attribute name="_CoordSysBuilder" value="ucar.nc2.internal.dataset.conv.CF1Convention" />
  <dimension name="time" length="21144" />
  <dimension name="tbnds" length="2" />
  <dimension name="metadata_time" length="3" />
  <dimension name="d_Location" length="1" />
  <dimension name="qc_pressure_flags" length="3" />
  <dimension name="qc_temperature_flags" length="3" />
  <dimension name="d_D" length="75" />
  <dimension name="qc_particle_number_size_distribution_amean_flags" length="3" />
  <dimension name="qc_particle_number_size_distribution_prec1587_flags" length="3" />
  <dimension name="qc_particle_number_size_distribution_perc8413_flags" length="3" />
  <group name="CFMetadata">
    <attribute name="time_coverage_start" value="2009-01-01T00:30:00Z" />
    <attribute name="time_coverage_end" value="2011-05-31T23:30:00Z" />
    <attribute name="time_coverage_units" value="seconds" />
    <attribute name="time_coverage_resolution" value="3600.0" />
    <attribute name="time_coverage_duration" value="P0Y0M880DT23H0M0.000S" />
  </group>
  <group name="NCISOMetadata">
    <attribute name="metadata_creation" value="2026-05-18" />
    <attribute name="nciso_version" value="2.4.8" />
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    <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>
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    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="air_pressure" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="hPa" />
    <attribute name="ancillary_variables" value="qc_pressure meta_pressure" />
    <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="2014-05-01T00:00:00.000000Z" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_station_code" value="BG0001R" />
    <attribute name="ebas_platform_code" value="BG0001S" />
    <attribute name="ebas_station_name" value="BEO Moussala" />
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    <attribute name="ebas_station_longitude" type="double" value="23.583333" />
    <attribute name="ebas_station_altitude" value="2971.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="pressure" />
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    <attribute name="ebas_matrix" value="aerosol" />
    <attribute name="ebas_laboratory_code" value="BG01L" />
    <attribute name="ebas_instrument_type" value="smps" />
    <attribute name="ebas_instrument_name" value="SMPS_IFT" />
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    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Ann Mari Fjaeraa, Markus Fiebig" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, amf@nilu.no, Markus.Fiebig@nilu.no" />
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    <attribute name="ebas_submitter" value="&quot;Kalapov, Ivo, , , , , , , , , &quot;" />
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    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
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    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="air_temperature" />
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    <attribute name="units" value="K" />
    <attribute name="ancillary_variables" value="qc_temperature meta_temperature" />
    <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="2014-05-01T00:00:00.000000Z" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_station_code" value="BG0001R" />
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    <attribute name="ebas_station_name" value="BEO Moussala" />
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    <attribute name="ebas_component" value="temperature" />
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    <attribute name="ebas_laboratory_code" value="BG01L" />
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    <attribute name="_FillValue" type="double" value="NaN" />
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    <attribute name="units" value="1/cm3" />
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