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  <attribute name="title" value="Ground based in situ observations of aerosol_absorption_coefficient at Alert (CA0420G) using filter_absorption_photometer" />
  <attribute name="keywords" value="Alert, NOAA-ESRL, CA0420G, aerosol, GAW-WDCA, volume_absorption_coefficient_in_air_due_to_dried_aerosol_particles, aerosol_absorption_coefficient" />
  <attribute name="id" value="W5QF-8Y36.nc" />
  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="GAW-WDCA, NOAA-ESRL" />
  <attribute name="acknowledgement" value="Request acknowledgement details from data originator" />
  <attribute name="doi" value="https://doi.org/10.48597/W5QF-8Y36" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, aerosol_absorption_coefficient - filter_absorption_photometer at Alert, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/W5QF-8Y36" />
  <attribute name="summary" value="Ground based in situ observations of aerosol_absorption_coefficient at Alert (CA0420G) using filter_absorption_photometer. 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: aerosol_absorption_coefficient in aerosol (volume_absorption_coefficient_in_air_due_to_dried_aerosol_particles), aerosol_absorption_coefficient in aerosol (volume_absorption_coefficient_in_air_due_to_dried_aerosol_particles), aerosol_absorption_coefficient in aerosol (volume_absorption_coefficient_in_air_due_to_dried_aerosol_particles)" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="CA01L, Environment Canada, EC/AES, Atmospheric Environmental Service, 4905 Dufferin Street, M3H 5T4, Downsview, Ontario, Canada" />
  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2020-02-28T09:13:26 UTC" />
  <attribute name="date_metadata_modified" value="2020-02-28T09:13:26 UTC" />
  <attribute name="creator_name" value="Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma" />
  <attribute name="creator_type" value="person" />
  <attribute name="creator_email" value="sangeeta.sharma@ec.gc.ca, sangeeta.sharma@ec.gc.ca, sangeeta.sharma@ec.gc.ca, sangeeta.sharma@ec.gc.ca, sangeeta.sharma@canada.ca" />
  <attribute name="creator_institution" value="&quot;Climate Chemistry Measurements Research, Environment Canada, EC&quot;, &quot;Climate Chemistry Measurements Research, Environment Canada, EC&quot;, &quot;Climate Chemistry Measurements Research, Environment Canada, EC&quot;, &quot;Climate Chemistry Measurements Research, Environment Canada, EC&quot;, &quot;Climate Chemistry Measurements Research, Environment Canada, EC&quot;" />
  <attribute name="contributor_name" value="Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma" />
  <attribute name="contributor_role" value="data submitter, data submitter, data submitter, data submitter, 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" />
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  <attribute name="ebas_citation" value="Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, aerosol_absorption_coefficient - filter_absorption_photometer at Alert, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/W5QF-8Y36" />
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  <attribute name="ebas_sample_duration" value="1h" />
  <attribute name="ebas_orig_time_res" value="1mn" />
  <attribute name="ebas_station_code" value="CA0420G" />
  <attribute name="ebas_platform_code" value="CA0420S" />
  <attribute name="ebas_station_name" value="Alert" />
  <attribute name="ebas_station_wdca_id" value="GAWACANUALT" />
  <attribute name="ebas_station_gaw_id" value="ALT" />
  <attribute name="ebas_station_gaw_name" value="Alert" />
  <attribute name="ebas_station_state_province" value="NU" />
  <attribute name="ebas_station_land_use" value="Military reservation" />
  <attribute name="ebas_station_setting" value="Polar" />
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  <attribute name="ebas_station_longitude" value="-62.3415260315" />
  <attribute name="ebas_station_altitude" value="210.0 m" />
  <attribute name="ebas_measurement_height" value="10.0 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="aerosol" />
  <attribute name="ebas_laboratory_code" value="CA01L" />
  <attribute name="ebas_instrument_type" value="filter_absorption_photometer" />
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  <attribute name="ebas_instrument_manufacturer" value="Magee" />
  <attribute name="ebas_instrument_model" value="AE31" />
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  <attribute name="ebas_inlet_type" value="Hat or hood" />
  <attribute name="ebas_humidity_temperaure_control" value="None" />
  <attribute name="ebas_volume_std_temperature" value="273.15 K" />
  <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
  <attribute name="ebas_detection_limit_expl" value="Determined by instrument noise characteristics, no detection limit flag used" />
  <attribute name="ebas_measurement_uncertainty" value="25.0 %" />
  <attribute name="ebas_measurement_uncertainty_expl" value="Intercomparisons with thermo-optical analysis have shown an uncertainty of a faktor 2 regardless specific absorption cross-section assumed." />
  <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="CA01L, Environment Canada, EC/AES, Atmospheric Environmental Service, 4905 Dufferin Street, , M3H 5T4, &quot;Downsview, Ontario&quot;, Canada" />
  <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="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., " />
  <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="Sharma, Sangeeta, sangeeta.sharma@canada.ca, &quot;Climate Chemistry Measurements Research, Environment Canada&quot;, EC, , 4905 Dufferin Street, , M3H 5T4, &quot;Downsview, Ontario&quot;, Canada" />
  <attribute name="ebas_submitter" value="Sharma, Sangeeta, sangeeta.sharma@canada.ca, &quot;Climate Chemistry Measurements Research, Environment Canada&quot;, EC, , 4905 Dufferin Street, , M3H 5T4, &quot;Downsview, Ontario&quot;, Canada" />
  <attribute name="ebas_acknowledgement" value="Request acknowledgement details from data originator" />
  <attribute name="ebas_comment" value="calibration factor / mean ratio=1.0; sample_spot_area=5e-5 m2; defaults assumed for mean ratio and spot area" />
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  <attribute name="comment" value="{&#xA;    &quot;Data definition&quot;: &quot;EBAS_1.1&quot;,&#xA;    &quot;Data license&quot;: &quot;https://creativecommons.org/licenses/by/4.0/&quot;,&#xA;    &quot;Citation&quot;: &quot;Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, Sangeeta Sharma, aerosol_absorption_coefficient - filter_absorption_photometer at Alert, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/W5QF-8Y36&quot;,&#xA;    &quot;Set type code&quot;: &quot;TU&quot;,&#xA;    &quot;Timezone&quot;: &quot;UTC&quot;,&#xA;    &quot;File name&quot;: &quot;W5QF-8Y36.nc&quot;,&#xA;    &quot;Represents DOI&quot;: &quot;https://doi.org/10.48597/W5QF-8Y36&quot;,&#xA;    &quot;Contains data from DOI&quot;: &quot;https://doi.org/10.48597/W5QF-8Y36&quot;,&#xA;    &quot;File creation&quot;: &quot;2023-12-13T20:46:01.171813 UTC&quot;,&#xA;    &quot;Export state&quot;: &quot;2017-07-11T09:36:58.927000 UTC&quot;,&#xA;    &quot;Export filter&quot;: &quot;exclude-900,exclude-invalid&quot;,&#xA;    &quot;Startdate&quot;: &quot;20090101000000&quot;,&#xA;    &quot;Revision date&quot;: &quot;20200228091326&quot;,&#xA;    &quot;Version&quot;: &quot;1&quot;,&#xA;    &quot;Version description&quot;: &quot;Version numbering not tracked, generated by data.aggregate.ebas r4678 -- Processing lev0-lev1: process_lev0_lev1_AE31 V.1.01.00-svn_1643M -- Processing lev1-lev2: process_lev1_lev2_general V.1.01.00-svn_1643M&quot;,&#xA;    &quot;Data level&quot;: &quot;2&quot;,&#xA;    &quot;Period code&quot;: &quot;5y&quot;,&#xA;    &quot;Resolution code&quot;: &quot;1h&quot;,&#xA;    &quot;Sample duration&quot;: &quot;1h&quot;,&#xA;    &quot;Orig. time res.&quot;: &quot;1mn&quot;,&#xA;    &quot;Station code&quot;: &quot;CA0420G&quot;,&#xA;    &quot;Platform code&quot;: &quot;CA0420S&quot;,&#xA;    &quot;Station name&quot;: &quot;Alert&quot;,&#xA;    &quot;Station WDCA-ID&quot;: &quot;GAWACANUALT&quot;,&#xA;    &quot;Station GAW-ID&quot;: &quot;ALT&quot;,&#xA;    &quot;Station GAW-Name&quot;: &quot;Alert&quot;,&#xA;    &quot;Station state/province&quot;: &quot;NU&quot;,&#xA;    &quot;Station land use&quot;: &quot;Military reservation&quot;,&#xA;    &quot;Station setting&quot;: &quot;Polar&quot;,&#xA;    &quot;Station GAW type&quot;: &quot;G&quot;,&#xA;    &quot;Station WMO region&quot;: &quot;4&quot;,&#xA;    &quot;Station latitude&quot;: &quot;82.4991455078&quot;,&#xA;    &quot;Station longitude&quot;: &quot;-62.3415260315&quot;,&#xA;    &quot;Station altitude&quot;: &quot;210.0 m&quot;,&#xA;    &quot;Measurement height&quot;: &quot;10.0 m&quot;,&#xA;    &quot;Regime&quot;: &quot;IMG&quot;,&#xA;    &quot;Component&quot;: &quot;aerosol_absorption_coefficient&quot;,&#xA;    &quot;Unit&quot;: &quot;1/Mm&quot;,&#xA;    &quot;Matrix&quot;: &quot;aerosol&quot;,&#xA;    &quot;Laboratory code&quot;: &quot;CA01L&quot;,&#xA;    &quot;Instrument type&quot;: &quot;filter_absorption_photometer&quot;,&#xA;    &quot;Instrument name&quot;: &quot;Magee_AE31_ALT&quot;,&#xA;    &quot;Instrument manufacturer&quot;: &quot;Magee&quot;,&#xA;    &quot;Instrument model&quot;: &quot;AE31&quot;,&#xA;    &quot;Instrument serial number&quot;: &quot;771&quot;,&#xA;    &quot;Method ref&quot;: &quot;CA01L_aethalometer&quot;,&#xA;    &quot;Standard method&quot;: &quot;SOP=GAW227&quot;,&#xA;    &quot;Inlet type&quot;: &quot;Hat or hood&quot;,&#xA;    &quot;Humidity/temperature control&quot;: &quot;None&quot;,&#xA;    &quot;Volume std. temperature&quot;: &quot;273.15 K&quot;,&#xA;    &quot;Volume std. pressure&quot;: &quot;1013.25 hPa&quot;,&#xA;    &quot;Detection limit expl.&quot;: &quot;Determined by instrument noise characteristics, no detection limit flag used&quot;,&#xA;    &quot;Measurement uncertainty&quot;: &quot;25.0 %&quot;,&#xA;    &quot;Measurement uncertainty expl.&quot;: &quot;Intercomparisons with thermo-optical analysis have shown an uncertainty of a faktor 2 regardless specific absorption cross-section assumed.&quot;,&#xA;    &quot;Zero/negative values code&quot;: &quot;Zero/negative possible&quot;,&#xA;    &quot;Zero/negative values&quot;: &quot;Zero and neg. values may appear due to statistical variations at very low concentrations&quot;,&#xA;    &quot;Organization&quot;: &quot;CA01L, Environment Canada, EC/AES, Atmospheric Environmental Service, 4905 Dufferin Street, , M3H 5T4, \&quot;Downsview, Ontario\&quot;, Canada&quot;,&#xA;    &quot;Framework acronym&quot;: &quot;GAW-WDCA, NOAA-ESRL&quot;,&#xA;    &quot;Framework name&quot;: &quot;World Data Centre for Aerosols, &quot;,&#xA;    &quot;Framework description&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;,&#xA;    &quot;Framework contact name&quot;: &quot;Markus Fiebig, Markus Fiebig&quot;,&#xA;    &quot;Framework contact email&quot;: &quot;Markus.Fiebig@nilu.no, Markus.Fiebig@nilu.no&quot;,&#xA;    &quot;Originator&quot;: &quot;Sharma, Sangeeta, sangeeta.sharma@canada.ca, \&quot;Climate Chemistry Measurements Research, Environment Canada\&quot;, EC, , 4905 Dufferin Street, , M3H 5T4, \&quot;Downsview, Ontario\&quot;, Canada&quot;,&#xA;    &quot;Submitter&quot;: &quot;Sharma, Sangeeta, sangeeta.sharma@canada.ca, \&quot;Climate Chemistry Measurements Research, Environment Canada\&quot;, EC, , 4905 Dufferin Street, , M3H 5T4, \&quot;Downsview, Ontario\&quot;, Canada&quot;,&#xA;    &quot;Acknowledgement&quot;: &quot;Request acknowledgement details from data originator&quot;,&#xA;    &quot;Comment&quot;: &quot;calibration factor / mean ratio=1.0; sample_spot_area=5e-5 m2; defaults assumed for mean ratio and spot area&quot;&#xA;}" />
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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_acknowledgement" value="Request acknowledgement details from data originator" />
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    <attribute name="ebas_instrument_serial_number" value="771" />
    <attribute name="ebas_method_ref" value="CA01L_aethalometer" />
    <attribute name="ebas_standard_method" value="SOP=GAW227" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_detection_limit" value="0.112857 1/Mm" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument noise characteristics, no detection limit flag used" />
    <attribute name="ebas_measurement_uncertainty" value="25.0 %" />
    <attribute name="ebas_measurement_uncertainty_expl" value="Intercomparisons with thermo-optical analysis have shown an uncertainty of a faktor 2 regardless specific absorption cross-section assumed." />
    <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="CA01L, Environment Canada, EC/AES, Atmospheric Environmental Service, 4905 Dufferin Street, , M3H 5T4, &quot;Downsview, Ontario&quot;, Canada" />
    <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="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., " />
    <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="Sharma, Sangeeta, sangeeta.sharma@canada.ca, &quot;Climate Chemistry Measurements Research, Environment Canada&quot;, EC, , 4905 Dufferin Street, , M3H 5T4, &quot;Downsview, Ontario&quot;, Canada" />
    <attribute name="ebas_submitter" value="Sharma, Sangeeta, sangeeta.sharma@canada.ca, &quot;Climate Chemistry Measurements Research, Environment Canada&quot;, EC, , 4905 Dufferin Street, , M3H 5T4, &quot;Downsview, Ontario&quot;, Canada" />
    <attribute name="ebas_acknowledgement" value="Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="calibration factor / mean ratio=1.0; sample_spot_area=5e-5 m2; defaults assumed for mean ratio and spot area" />
  </variable>
  <variable name="aerosol_absorption_coefficient_perc8413_6_qc" shape="aerosol_absorption_coefficient_perc8413_6_qc_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="aerosol_absorption_coefficient_perc8413_6_ebasmetadata" shape="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 1900-01-01 00:00:00 UTC" />
    <attribute name="axis" value="T" />
    <attribute name="calendar" value="gregorian" />
    <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 1900-01-01 00:00:00 UTC" />
    <attribute name="axis" value="T" />
    <attribute name="calendar" value="gregorian" />
    <attribute name="bounds" value="metadata_time_bnds" />
    <attribute name="_CoordinateAxisType" value="Time" />
  </variable>
</netcdf>
