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  <attribute name="featureType" value="timeSeries" />
  <attribute name="title" value="Aerosol_absorption_coefficient at Vielsalm" />
  <attribute name="summary" value="Aerosol_absorption_coefficient at Vielsalm. These measurements are gathered as a part of the following projects ACTRIS, EMEP, GAW-WDCA and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['relative_humidity in instrument (relative_humidity)', 'temperature in instrument', 'aerosol_absorption_coefficient in pm10']" />
  <attribute name="keywords" value="Vielsalm BE0007R aerosol_absorption_coefficient pm10 ACTRIS EMEP GAW-WDCA relative_humidity" />
  <attribute name="id" value="AA3Y-K34M.nc" />
  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="ACTRIS, EMEP, GAW-WDCA" />
  <attribute name="acknowledgement" value="" />
  <attribute name="doi" value="https://doi.org/10.48597/AA3Y-K34M" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Bergmans, B., Spanu, L., ACTRIS, EMEP, GAW-WDCA, 2026, Aerosol_absorption_coefficient at Vielsalm, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/AA3Y-K34M" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="BE03L &quot;Institut Scientifique de Service Public&quot; ISSeP &quot;Rue Chéra, 200&quot; 4000 Liege Belgium" />
  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2026-06-01T07:27:02.955488Z" />
  <attribute name="date_metadata_modified" value="2026-05-29T00:00:00Z" />
  <attribute name="creator_name" value="Benjamin Bergmans, Laurent Spanu" />
  <attribute name="creator_type" value="person" />
  <attribute name="creator_email" value="b.bergmans@issep.be, l.spanu@issep.be" />
  <attribute name="creator_institution" value="&quot;Institut Scientifique de Service Public, 200, ISSeP&quot;, &quot;Institut Scientifique de Service Public, 200, ISSeP&quot;" />
  <attribute name="contributor_name" value="Benjamin Palmaerts" />
  <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="6.001271" />
  <attribute name="geospatial_vertical_min" type="double" value="487.0" />
  <attribute name="geospatial_vertical_max" type="double" value="487.0" />
  <attribute name="geospatial_vertical_positive" value="up" />
  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
  <attribute name="time_coverage_start" value="2025-01-01T00:00:00Z" />
  <attribute name="time_coverage_end" value="2025-09-30T11:00:00Z" />
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  <attribute name="timezone" value="UTC" />
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  <attribute name="ebas_citation" value="Bergmans, B., Spanu, L., ACTRIS, EMEP, GAW-WDCA, 2026, Aerosol_absorption_coefficient at Vielsalm, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/AA3Y-K34M" />
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  <attribute name="ebas_period_code" value="9mo" />
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  <attribute name="ebas_orig_time_res" value="1mn" />
  <attribute name="ebas_station_code" value="BE0007R" />
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  <attribute name="ebas_station_name" value="Vielsalm" />
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  <attribute name="ebas_station_longitude" type="double" value="6.001271" />
  <attribute name="ebas_station_altitude" value="487.0 m" />
  <attribute name="ebas_measurement_height" value="3.5 m" />
  <attribute name="ebas_regime" value="IMG" />
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  <attribute name="ebas_instrument_type" value="filter_absorption_photometer" />
  <attribute name="ebas_instrument_name" value="N085BC" />
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  <attribute name="ebas_inlet_description" value="PM10 head, Downward facing with insect protection" />
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  <attribute name="ebas_maintenance_description" value="Monthly preventive test, flow check or calib, zero air check, full maintenance and calibration at TROPOS WCCAP every 2 years" />
  <attribute name="ebas_flow_rate" value="5.0 l/min" />
  <attribute name="ebas_humidity_temperaure_control" value="Temperature conditioning at 20 deg. C" />
  <attribute name="ebas_humidity_temperaure_control_description" value="Shelter is air-conditioned. Nafion dryer. Air dried to RH &lt; 40 %." />
  <attribute name="ebas_volume_std_temperature" value="293.15 K" />
  <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
  <attribute name="ebas_zero_negative_values_code" value="Zero possible" />
  <attribute name="ebas_zero_negative_values" value="Negative values set to 0" />
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  <attribute name="ebas_framework_acronym" value="ACTRIS, EMEP, GAW-WDCA" />
  <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, European Monitoring and Evaluation Programme, 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;, The European Monitoring and Evaluation Programme (EMEP) is a scientifically based and policy driven programme under the Convention on Long-range Transboundary Air Pollution (CLRTAP) for int'l co-operation to solve transboundary air pollution problems., &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, Kjetil Tørseth, Markus Fiebig" />
  <attribute name="ebas_framework_contact_email" value="clm@nilu.no, kt@nilu.no, Markus.Fiebig@nilu.no" />
  <attribute name="ebas_originator" value="&quot;Bergmans, Benjamin, b.bergmans@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chera 200, , 4000 Liege, Belgium&quot;, &quot;Spanu, Laurent, l.spanu@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chéra 200, 4000, Liège, Belgium&quot;" />
  <attribute name="ebas_submitter" value="&quot;Palmaerts, Benjamin, b.palmaerts@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chéra 200, 4000, Liège, Belgium&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, EMEP, GAW-WDCA. Request acknowledgement details from data originator" />
  <attribute name="ebas_comment" value="Instrument AE33 (N085BC) replaced by AE36 (N085BC36) on 30.09.2025" />
  <attribute name="_NCProperties" value="version=2,netcdf=4.9.3,hdf5=1.14.6" />
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  <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="6539" />
  <dimension name="tbnds" length="2" />
  <dimension name="metadata_time" length="1" />
  <dimension name="d_Location" length="1" />
  <dimension name="qc_relative_humidity_flags" length="1" />
  <dimension name="qc_temperature_flags" length="1" />
  <dimension name="d_Wavelength" length="1" />
  <dimension name="qc_aerosol_absorption_coefficient_flags" length="1" />
  <group name="CFMetadata">
    <attribute name="time_coverage_start" value="2025-01-01T00:30:00Z" />
    <attribute name="time_coverage_end" value="2025-09-30T10:30:00Z" />
    <attribute name="time_coverage_units" value="seconds" />
    <attribute name="time_coverage_resolution" value="3600.0" />
    <attribute name="time_coverage_duration" value="P0Y0M272DT10H0M0.000S" />
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  <group name="NCISOMetadata">
    <attribute name="metadata_creation" value="2026-06-26" />
    <attribute name="nciso_version" value="2.4.8" />
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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" />
  </variable>
  <variable name="v_relative_humidity" shape="d_Location 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="%" />
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    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
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    <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;, The European Monitoring and Evaluation Programme (EMEP) is a scientifically based and policy driven programme under the Convention on Long-range Transboundary Air Pollution (CLRTAP) for int'l co-operation to solve transboundary air pollution problems., &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, Kjetil Tørseth, Markus Fiebig" />
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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: ACTRIS, EMEP, GAW-WDCA. Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="Instrument AE33 (N085BC) replaced by AE36 (N085BC36) on 30.09.2025" />
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    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
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    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Kjetil Tørseth, Markus Fiebig" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, kt@nilu.no, Markus.Fiebig@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Bergmans, Benjamin, b.bergmans@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chera 200, , 4000 Liege, Belgium&quot;, &quot;Spanu, Laurent, l.spanu@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chéra 200, 4000, Liège, Belgium&quot;" />
    <attribute name="ebas_submitter" value="&quot;Palmaerts, Benjamin, b.palmaerts@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chéra 200, 4000, Liège, Belgium&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, EMEP, GAW-WDCA. Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="Instrument AE33 (N085BC) replaced by AE36 (N085BC36) on 30.09.2025" />
  </variable>
  <variable name="qc_temperature" shape="d_Location qc_temperature_flags time" type="int">
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    <attribute name="standard_name" value="status_flag" />
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    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_aerosol_absorption_coefficient" shape="d_Wavelength time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="1/Mm" />
    <attribute name="ancillary_variables" value="qc_aerosol_absorption_coefficient meta_aerosol_absorption_coefficient" />
    <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="2026-05-29T00:00:00.000000Z" />
    <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="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="BE0007R" />
    <attribute name="ebas_platform_code" value="BE0007S" />
    <attribute name="ebas_station_name" value="Vielsalm" />
    <attribute name="ebas_station_latitude" type="double" value="50.304003" />
    <attribute name="ebas_station_longitude" type="double" value="6.001271" />
    <attribute name="ebas_station_altitude" value="487.0 m" />
    <attribute name="ebas_measurement_height" value="3.5 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="pm10" />
    <attribute name="ebas_laboratory_code" value="BE03L" />
    <attribute name="ebas_instrument_type" value="filter_absorption_photometer" />
    <attribute name="ebas_instrument_name" value="N085BC" />
    <attribute name="ebas_instrument_manufacturer" value="Magee" />
    <attribute name="ebas_instrument_model" value="AE33" />
    <attribute name="ebas_instrument_serial_number" value="S10-01496" />
    <attribute name="ebas_method_ref" value="BE03L_AE33" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="PM10 head, Downward facing with insect protection" />
    <attribute name="ebas_inlet_tube_material" value="Stainless steel" />
    <attribute name="ebas_inlet_tube_outer_diameter" value="9.0 mm" />
    <attribute name="ebas_inlet_tube_length" value="2.0 m" />
    <attribute name="ebas_maintenance_description" value="Monthly preventive test, flow check or calib, zero air check, full maintenance and calibration at TROPOS WCCAP every 2 years" />
    <attribute name="ebas_flow_rate" value="5.0 l/min" />
    <attribute name="ebas_humidity_temperaure_control" value="Temperature conditioning at 20 deg. C" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Shelter is air-conditioned. Nafion dryer. Air dried to RH &lt; 40 %." />
    <attribute name="ebas_volume_std_temperature" value="293.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_detection_limit" value="0.022 1/Mm" />
    <attribute name="ebas_detection_limit_expl" value="LOD for eBC in ug/m3 was taken from the instrument specification and converted to aerosol_absorption_coefficient" />
    <attribute name="ebas_zero_negative_values_code" value="Zero possible" />
    <attribute name="ebas_zero_negative_values" value="Negative values set to 0" />
    <attribute name="ebas_organization" value="BE03L, Institut Scientifique de Service Public, ISSeP, , &quot;Rue Chéra, 200&quot;, , 4000, Liege, Belgium" />
    <attribute name="ebas_framework_acronym" value="ACTRIS, EMEP, GAW-WDCA" />
    <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, European Monitoring and Evaluation Programme, 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;, The European Monitoring and Evaluation Programme (EMEP) is a scientifically based and policy driven programme under the Convention on Long-range Transboundary Air Pollution (CLRTAP) for int'l co-operation to solve transboundary air pollution problems., &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, Kjetil Tørseth, Markus Fiebig" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, kt@nilu.no, Markus.Fiebig@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Bergmans, Benjamin, b.bergmans@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chera 200, , 4000 Liege, Belgium&quot;, &quot;Spanu, Laurent, l.spanu@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chéra 200, 4000, Liège, Belgium&quot;" />
    <attribute name="ebas_submitter" value="&quot;Palmaerts, Benjamin, b.palmaerts@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chéra 200, 4000, Liège, Belgium&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, EMEP, GAW-WDCA. Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="Instrument AE33 (N085BC) replaced by AE36 (N085BC36) on 30.09.2025" />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/aerosolparticlelightabsorptioncoefficient" />
    <attribute name="actris_variable_preferred_term" value="aerosol particle light absorption coefficient" />
    <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/filterabsorptionphotometer" />
    <attribute name="actris_instrument_type_preferred_term" value="filter absorption photometer" />
    <attribute name="actris_framework_uri" value="https://vocabulary.actris.nilu.no/actris_controlled_lists/ACTRIS, https://vocabulary.actris.nilu.no/actris_controlled_lists/EMEP, https://vocabulary.actris.nilu.no/actris_controlled_lists/GAW-WDCA" />
    <attribute name="actris_framework_preferred_term" value="ACTRIS, EMEP, GAW-WDCA" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_aerosol_absorption_coefficient" shape="d_Wavelength qc_aerosol_absorption_coefficient_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_aerosol_absorption_coefficient" shape="d_Wavelength 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" />
  </variable>
  <variable name="d_Location" shape="d_Location" type="String" />
  <variable name="d_Wavelength" shape="d_Wavelength" type="double" />
</netcdf>
