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  <attribute name="title" value="Aerosol_absorption_coefficient at Hyytiälä" />
  <attribute name="summary" value="Aerosol_absorption_coefficient at Hyytiälä. These measurements are gathered as a part of the following projects ACTRIS, GAW-WDCA, NOAA-ESRL and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['pressure in instrument', 'relative_humidity in instrument (relative_humidity)', 'temperature in instrument', 'aerosol_absorption_coefficient in pm10']" />
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  <attribute name="doi" value="https://doi.org/10.48597/XUUK-63WW" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Kulmala, M., Petäjä, T., ACTRIS, GAW-WDCA, NOAA-ESRL, 2026, Aerosol_absorption_coefficient at Hyytiälä, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/XUUK-63WW" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="FI03L &quot;University of Helsinki&quot; UHEL &quot;Institute for Atmospheric and Earth System Research (INAR)&quot; &quot;PO BOX 64&quot; FI-00014 &quot;University of Helsinki&quot; Finland" />
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  <attribute name="creator_name" value="Markku Kulmala, Tuukka Petäjä" />
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  <attribute name="contributor_name" value="Markku Kulmala, Tuukka Petäjä, Elomaa Tapio, Derek Hageman" />
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  <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, World Data Centre for Aerosols, " />
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  <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Markus Fiebig, Markus Fiebig" />
  <attribute name="ebas_framework_contact_email" value="clm@nilu.no, Markus.Fiebig@nilu.no, Markus.Fiebig@nilu.no" />
  <attribute name="ebas_originator" value="&quot;Kulmala, Markku, , , , , , , , , &quot;, &quot;Petäjä, Tuukka, tuukka.petaja@helsinki.fi, University of Helsinki, UHEL, &quot;&quot;Division of Atmospheric Sciences, Department of Physics&quot;&quot;, PO BOX 64, , FI-00014, University of Helsinki, Finland&quot;" />
  <attribute name="ebas_submitter" value="&quot;Kulmala, Markku, , , , , , , , , &quot;, &quot;Petäjä, Tuukka, tuukka.petaja@helsinki.fi, University of Helsinki, UHEL, &quot;&quot;Division of Atmospheric Sciences, Department of Physics&quot;&quot;, PO BOX 64, , FI-00014, University of Helsinki, Finland&quot;, &quot;Tapio, Elomaa, tapio.elomaa@helsinki.fi, University of Helsinki, UHEL, Institute for Atmospheric and Earth System Research, Gustaf Hällströmin katu 2, , FI-00560, Helsinki, Finland&quot;, &quot;Hageman, Derek, derek.hageman@helsinki.fi, University of Helsinki, UHEL, Institute for Atmospheric and Earth System Research, Gustaf Hällströmin katu 2, , FI-00560, Helsinki, Finland&quot;" />
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    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, Markus.Fiebig@nilu.no, Markus.Fiebig@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Kulmala, Markku, , , , , , , , , &quot;, &quot;Petäjä, Tuukka, tuukka.petaja@helsinki.fi, University of Helsinki, UHEL, &quot;&quot;Division of Atmospheric Sciences, Department of Physics&quot;&quot;, PO BOX 64, , FI-00014, University of Helsinki, Finland&quot;" />
    <attribute name="ebas_submitter" value="&quot;Kulmala, Markku, , , , , , , , , &quot;, &quot;Petäjä, Tuukka, tuukka.petaja@helsinki.fi, University of Helsinki, UHEL, &quot;&quot;Division of Atmospheric Sciences, Department of Physics&quot;&quot;, PO BOX 64, , FI-00014, University of Helsinki, Finland&quot;, &quot;Tapio, Elomaa, tapio.elomaa@helsinki.fi, University of Helsinki, UHEL, Institute for Atmospheric and Earth System Research, Gustaf Hällströmin katu 2, , FI-00560, Helsinki, Finland&quot;, &quot;Hageman, Derek, derek.hageman@helsinki.fi, University of Helsinki, UHEL, Institute for Atmospheric and Earth System Research, Gustaf Hällströmin katu 2, , FI-00560, Helsinki, Finland&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, GAW-WDCA, NOAA-ESRL. Request acknowledgement details from data originator" />
  </variable>
  <variable name="qc_relative_humidity" shape="d_Location_d1 qc_relative_humidity_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_relative_humidity" shape="d_Location_d1 metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_temperature" shape="d_Location_d0 time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="missing_value" type="double" value="NaN" />
    <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="2026-01-21T13:20:31.000000Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="Version numbering not tracked, generated by Forge 1.0.5 and EBAS-IO V.4.04.00" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_station_code" value="FI0050R" />
    <attribute name="ebas_platform_code" value="FI0050S" />
    <attribute name="ebas_station_name" value="Hyytiälä" />
    <attribute name="ebas_station_gaw_id" value="SMR" />
    <attribute name="ebas_station_state_province" value="Pirka" />
    <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="61.85" />
    <attribute name="ebas_station_longitude" type="double" value="24.283333" />
    <attribute name="ebas_station_altitude" value="181.0 m" />
    <attribute name="ebas_measurement_latitude" type="double" value="61.847384" />
    <attribute name="ebas_measurement_longitude" type="double" value="24.29478" />
    <attribute name="ebas_measurement_altitude" value="181.0 m" />
    <attribute name="ebas_measurement_height" value="4.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="temperature" />
    <attribute name="ebas_unit" value="K" />
    <attribute name="ebas_matrix" value="instrument" />
    <attribute name="ebas_laboratory_code" value="FI03L" />
    <attribute name="ebas_instrument_type" value="filter_absorption_photometer" />
    <attribute name="ebas_instrument_name" value="Thermo_5012_SMR_pm10" />
    <attribute name="ebas_instrument_manufacturer" value="Thermo" />
    <attribute name="ebas_instrument_model" value="5012" />
    <attribute name="ebas_instrument_serial_number" value="286" />
    <attribute name="ebas_method_ref" value="FI03L_MAAP_5012" />
    <attribute name="ebas_standard_method" value="Multi-angle_Correction=Petzold2004" />
    <attribute name="ebas_inlet_type" value="Impactor--direct" />
    <attribute name="ebas_inlet_description" value="Impactor at 10 um" />
    <attribute name="ebas_flow_rate" value="5.0 l/min" />
    <attribute name="ebas_humidity_temperaure_control" value="Nafion dryer" />
    <attribute name="ebas_humidity_temperaure_control_description" value="air dried from ambient with nafion drier" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative possible" />
    <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="FI03L, University of Helsinki, UHEL, Institute for Atmospheric and Earth System Research (INAR), PO BOX 64, , FI-00014, University of Helsinki, Finland" />
    <attribute name="ebas_framework_acronym" value="ACTRIS, GAW-WDCA, NOAA-ESRL" />
    <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, 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;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, Markus Fiebig, Markus Fiebig" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, Markus.Fiebig@nilu.no, Markus.Fiebig@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Kulmala, Markku, , , , , , , , , &quot;, &quot;Petäjä, Tuukka, tuukka.petaja@helsinki.fi, University of Helsinki, UHEL, &quot;&quot;Division of Atmospheric Sciences, Department of Physics&quot;&quot;, PO BOX 64, , FI-00014, University of Helsinki, Finland&quot;" />
    <attribute name="ebas_submitter" value="&quot;Kulmala, Markku, , , , , , , , , &quot;, &quot;Petäjä, Tuukka, tuukka.petaja@helsinki.fi, University of Helsinki, UHEL, &quot;&quot;Division of Atmospheric Sciences, Department of Physics&quot;&quot;, PO BOX 64, , FI-00014, University of Helsinki, Finland&quot;, &quot;Tapio, Elomaa, tapio.elomaa@helsinki.fi, University of Helsinki, UHEL, Institute for Atmospheric and Earth System Research, Gustaf Hällströmin katu 2, , FI-00560, Helsinki, Finland&quot;, &quot;Hageman, Derek, derek.hageman@helsinki.fi, University of Helsinki, UHEL, Institute for Atmospheric and Earth System Research, Gustaf Hällströmin katu 2, , FI-00560, Helsinki, Finland&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, GAW-WDCA, NOAA-ESRL. Request acknowledgement details from data originator" />
  </variable>
  <variable name="qc_temperature" shape="d_Location_d0 qc_temperature_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_temperature" shape="d_Location_d0 metadata_time" type="String">
    <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="2026-01-21T13:20:31.000000Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="Version numbering not tracked, generated by Forge 1.0.5 and EBAS-IO V.4.04.00" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_station_code" value="FI0050R" />
    <attribute name="ebas_platform_code" value="FI0050S" />
    <attribute name="ebas_station_name" value="Hyytiälä" />
    <attribute name="ebas_station_gaw_id" value="SMR" />
    <attribute name="ebas_station_state_province" value="Pirka" />
    <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="61.85" />
    <attribute name="ebas_station_longitude" type="double" value="24.283333" />
    <attribute name="ebas_station_altitude" value="181.0 m" />
    <attribute name="ebas_measurement_latitude" type="double" value="61.847384" />
    <attribute name="ebas_measurement_longitude" type="double" value="24.29478" />
    <attribute name="ebas_measurement_altitude" value="181.0 m" />
    <attribute name="ebas_measurement_height" value="4.0 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="pm10" />
    <attribute name="ebas_laboratory_code" value="FI03L" />
    <attribute name="ebas_instrument_type" value="filter_absorption_photometer" />
    <attribute name="ebas_instrument_name" value="Thermo_5012_SMR_pm10" />
    <attribute name="ebas_instrument_manufacturer" value="Thermo" />
    <attribute name="ebas_instrument_model" value="5012" />
    <attribute name="ebas_instrument_serial_number" value="286" />
    <attribute name="ebas_method_ref" value="FI03L_MAAP_5012" />
    <attribute name="ebas_standard_method" value="Multi-angle_Correction=Petzold2004" />
    <attribute name="ebas_inlet_type" value="Impactor--direct" />
    <attribute name="ebas_inlet_description" value="Impactor at 10 um" />
    <attribute name="ebas_flow_rate" value="5.0 l/min" />
    <attribute name="ebas_humidity_temperaure_control" value="Nafion dryer" />
    <attribute name="ebas_humidity_temperaure_control_description" value="air dried from ambient with nafion drier" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative possible" />
    <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="FI03L, University of Helsinki, UHEL, Institute for Atmospheric and Earth System Research (INAR), PO BOX 64, , FI-00014, University of Helsinki, Finland" />
    <attribute name="ebas_framework_acronym" value="ACTRIS, GAW-WDCA, NOAA-ESRL" />
    <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, 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;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, Markus Fiebig, Markus Fiebig" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, Markus.Fiebig@nilu.no, Markus.Fiebig@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Kulmala, Markku, , , , , , , , , &quot;, &quot;Petäjä, Tuukka, tuukka.petaja@helsinki.fi, University of Helsinki, UHEL, &quot;&quot;Division of Atmospheric Sciences, Department of Physics&quot;&quot;, PO BOX 64, , FI-00014, University of Helsinki, Finland&quot;" />
    <attribute name="ebas_submitter" value="&quot;Kulmala, Markku, , , , , , , , , &quot;, &quot;Petäjä, Tuukka, tuukka.petaja@helsinki.fi, University of Helsinki, UHEL, &quot;&quot;Division of Atmospheric Sciences, Department of Physics&quot;&quot;, PO BOX 64, , FI-00014, University of Helsinki, Finland&quot;, &quot;Tapio, Elomaa, tapio.elomaa@helsinki.fi, University of Helsinki, UHEL, Institute for Atmospheric and Earth System Research, Gustaf Hällströmin katu 2, , FI-00560, Helsinki, Finland&quot;, &quot;Hageman, Derek, derek.hageman@helsinki.fi, University of Helsinki, UHEL, Institute for Atmospheric and Earth System Research, Gustaf Hällströmin katu 2, , FI-00560, Helsinki, Finland&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, GAW-WDCA, NOAA-ESRL. Request acknowledgement details from data originator" />
    <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/GAW-WDCA, https://vocabulary.actris.nilu.no/actris_controlled_lists/NOAA-ESRL" />
    <attribute name="actris_framework_preferred_term" value="ACTRIS, GAW-WDCA, NOAA-ESRL" />
    <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_d0" shape="d_Location_d0" type="String" />
  <variable name="d_Location_d1" shape="d_Location_d1" type="String" />
  <variable name="d_Wavelength" shape="d_Wavelength" type="double" />
</netcdf>
