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  <attribute name="title" value="Aerosol_absorption_coefficient at Trollhaugen" />
  <attribute name="summary" value="Aerosol_absorption_coefficient at Trollhaugen. These measurements are gathered as a part of the following projects ACTRIS, GAW-WDCA, NILU and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['aerosol_absorption_coefficient in pm10']" />
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  <attribute name="doi" value="https://doi.org/10.48597/ZXGP-ATK8" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Duflot, V., Bäcklund, A., Lunder, C., ACTRIS, GAW-WDCA, NILU, 2026, Aerosol_absorption_coefficient at Trollhaugen, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/ZXGP-ATK8" />
  <attribute name="source" value="surface observation" />
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  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2026-10-15T13:14:17.776347Z" />
  <attribute name="date_metadata_modified" value="2026-10-15T13:14:17Z" />
  <attribute name="creator_name" value="Valentin Duflot, Are Bäcklund, Chris Lunder" />
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  <attribute name="creator_email" value="vduf@nilu.no, abe@nilu.no, crl@nilu.no" />
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  <attribute name="contributor_name" value="Valentin Duflot, Are Bäcklund" />
  <attribute name="contributor_role" value="data submitter, data submitter" />
  <attribute name="publisher_type" value="institution" />
  <attribute name="publisher_name" value="NILU - Norwegian Institute for Air Research, ATMOS, EBAS" />
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  <attribute name="time_coverage_start" value="2020-01-23T14:00:00Z" />
  <attribute name="time_coverage_end" value="2024-01-01T00:00:00Z" />
  <attribute name="time_coverage_duration" value="P0003-11-08T10:00:00" />
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  <attribute name="timezone" value="UTC" />
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  <attribute name="ebas_citation" value="Duflot, V., Bäcklund, A., Lunder, C., ACTRIS, GAW-WDCA, NILU, 2026, Aerosol_absorption_coefficient at Trollhaugen, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/ZXGP-ATK8" />
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  <attribute name="ebas_matrix" value="pm10" />
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  <attribute name="ebas_inlet_description" value="PM10 at ambient humidity inlet" />
  <attribute name="ebas_humidity_temperaure_control" value="None" />
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  <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
  <attribute name="ebas_detection_limit_expl" value="Adapted from manufacturer specification" />
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  <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
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  <attribute name="ebas_framework_acronym" value="ACTRIS, GAW-WDCA, NILU" />
  <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, Norwegian Institute for Air Research" />
  <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;, Atmospheric measuremnts produced at NILU." />
  <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Markus Fiebig, Kjetil Tørseth" />
  <attribute name="ebas_framework_contact_email" value="clm@nilu.no, Markus.Fiebig@nilu.no, kt@nilu.no" />
  <attribute name="ebas_originator" value="&quot;Duflot, Valentin, vduf@nilu.no, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2027, Kjeller, Norway&quot;, &quot;Bäcklund, Are, abe@nilu.no, Norwegian Institute for Air Research, NILU, Monitoring and Instrumentation Technology, Instituttveien 18, , N-2027, Kjeller, Norway&quot;, &quot;Lunder, Chris, crl@nilu.no, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2007, Kjeller, Norway&quot;" />
  <attribute name="ebas_submitter" value="&quot;Duflot, Valentin, vduf@nilu.no, Norwegian Institute for Air Research, NILU, Atmosphere and Climate Department, Instituttveien 18, , 2027, Kjeller, Norway&quot;, &quot;Bäcklund, Are, abe@nilu.no, Norwegian Institute for Air Research, NILU, Monitoring and Instrumentation Technology, Instituttveien 18, , N-2027, 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 frameworks: ACTRIS, GAW-WDCA, NILU." />
  <attribute name="ebas_comment" value="Absorption calculated using MAC=18.47, 14.54, 13.14, 11.58, 10.35, 7.77, 7.19 m2/g, setting b_abs=eBC*MAC/H*; where the supplied Level-0 abs columns were audited but not used. H*=1.76, corresponding to filter type M8060. Values normalized to 273.15 K and 1013.25 hPa before H* correction. Instrument settings: C=1.39, Z=0.01. A documented instrument/tape C mismatch is corrected using C_used/C_reference=1. Recognized invalid Level-0 flags are propagated. QC also uses complete AE33 status/component checks, hard-invalid tape/stabilization hours, dual-spot loading-denominator checks, Fload&gt;2 rejection, daily corrected-spot consistency screening for 1.5&lt;Fload&lt;=2, and concentration-adaptive isolated-spike detection; hourly completeness is duration based. Hours with any arithmetic mean below the EBAS boundary of -0.5 1/Mm are invalidated." />
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  <dimension name="time" length="34522" />
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  <dimension name="d_Wavelength" length="7" />
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    <attribute name="standard_name" value="time" />
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