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  <attribute name="featureType" value="timeSeries" />
  <attribute name="title" value="TFA at Alert" />
  <attribute name="summary" value="TFA at Alert. These measurements are gathered as a part of the following projects AMAP_public and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['TFA in air+aerosol']" />
  <attribute name="keywords" value="Alert CA0420G TFA air+aerosol AMAP_public" />
  <attribute name="id" value="46ED-HJA8.nc" />
  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="AMAP_public" />
  <attribute name="acknowledgement" value="" />
  <attribute name="doi" value="https://doi.org/10.48597/46ED-HJA8" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Hung, H., AMAP_public, 2025, TFA at Alert, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/46ED-HJA8" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="CA01L &quot;Environment Canada&quot; EC/AES &quot;Atmospheric Environmental Service&quot; &quot;4905 Dufferin Street&quot; &quot;M3H 5T4&quot; &quot;Downsview, Ontario&quot; Canada" />
  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2026-01-20T10:08:44.431280Z" />
  <attribute name="date_metadata_modified" value="2025-12-22T09:24:51Z" />
  <attribute name="creator_name" value="Hayley Hung" />
  <attribute name="creator_type" value="person" />
  <attribute name="creator_email" value="" />
  <attribute name="creator_institution" value="" />
  <attribute name="contributor_name" value="Hayley Hung" />
  <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 EMPTY" />
  <attribute name="geospatial_vertical_positive" value="up" />
  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
  <attribute name="time_coverage_start" value="2023-01-23T16:04:00Z" />
  <attribute name="time_coverage_end" value="2023-10-09T17:11:00Z" />
  <attribute name="time_coverage_duration" value="P0000-08-16T01:07:00" />
  <attribute name="time_coverage_resolution" value="P0000-00-14T00:00:00" />
  <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="Hung, H., AMAP_public, 2025, TFA at Alert, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/46ED-HJA8" />
  <attribute name="ebas_set_type_code" value="TI" />
  <attribute name="ebas_timezone" value="UTC" />
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  <attribute name="ebas_represents_doi" value="https://doi.org/10.48597/46ED-HJA8" />
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  <attribute name="ebas_file_creation" value="2026-04-27T20:40:07.957949Z" />
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  <attribute name="ebas_startdate" value="2023-01-23T16:04:00.000000Z" />
  <attribute name="ebas_revision_date" value="2025-12-22T09:24:51.000000Z" />
  <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_period_code" value="37w" />
  <attribute name="ebas_resolution_code" value="2w" />
  <attribute name="ebas_sample_duration" value="1w" />
  <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" />
  <attribute name="ebas_station_gaw_type" value="G" />
  <attribute name="ebas_station_wmo_region" type="long" value="4" />
  <attribute name="ebas_station_latitude" type="double" value="82.4991455078" />
  <attribute name="ebas_station_longitude" type="double" value="-62.3415260315" />
  <attribute name="ebas_station_altitude" value="210.0 m" />
  <attribute name="ebas_regime" value="IMG" />
  <attribute name="ebas_component" value="TFA" />
  <attribute name="ebas_unit" value="pg/m3" />
  <attribute name="ebas_matrix" value="air+aerosol" />
  <attribute name="ebas_laboratory_code" value="CA01L" />
  <attribute name="ebas_instrument_type" value="high_vol_sampler" />
  <attribute name="ebas_instrument_name" value="HVPS1" />
  <attribute name="ebas_analytical_laboratory_code" value="CA01L" />
  <attribute name="ebas_analytical_measurement_technique" value="UHPLC-MS/MS" />
  <attribute name="ebas_analytical_instrument_name" value="LC-Exploris_A" />
  <attribute name="ebas_analytical_instrument_manufacturer" value="Thermo Scientific+Thermo Scientific" />
  <attribute name="ebas_analytical_instrument_model" value="Vanquish+Orbitrap Exploris 240" />
  <attribute name="ebas_analytical_instrument_serial_number" value="8336461+MM10383C" />
  <attribute name="ebas_method_ref" value="CA01L_UHPLC-MSMS" />
  <attribute name="ebas_filter_description" value="Whatman GF/C" />
  <attribute name="ebas_medium" value="Glass fiber+PUF+XAD+PUF" />
  <attribute name="ebas_sample_preparation" value="ASE+Methanol+13C" />
  <attribute name="ebas_blank_correction" value="Not blank corrected" />
  <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="AMAP_public" />
  <attribute name="ebas_framework_name" value="" />
  <attribute name="ebas_framework_description" value="" />
  <attribute name="ebas_framework_contact_name" value="Wenche Aas" />
  <attribute name="ebas_framework_contact_email" value="waa@nilu.no" />
  <attribute name="ebas_originator" value="&quot;Hung, Hayley, , , , , , , , , &quot;" />
  <attribute name="ebas_submitter" value="&quot;Hung, Hayley, , , , , , , , , &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 framework: AMAP_public." />
  <attribute name="ebas_comment" value="Analyzed in-house by Organic Analysis Laboratory" />
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  <attribute name="Metadata_Conventions" value="Unidata Dataset Discovery v1.0" />
  <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="_CoordSysBuilder" value="ucar.nc2.internal.dataset.conv.CF1Convention" />
  <dimension name="time" length="18" />
  <dimension name="tbnds" length="2" />
  <dimension name="metadata_time" length="1" />
  <dimension name="qc_TFA_flags" length="1" />
  <group name="CFMetadata">
    <attribute name="time_coverage_start" value="2023-01-27T04:41:29Z" />
    <attribute name="time_coverage_end" value="2023-10-06T06:04:30Z" />
    <attribute name="time_coverage_units" value="seconds" />
    <attribute name="time_coverage_resolution" value="1281045.0" />
    <attribute name="time_coverage_duration" value="P0Y0M252DT1H23M0.001S" />
  </group>
  <group name="NCISOMetadata">
    <attribute name="metadata_creation" value="2026-05-17" />
    <attribute name="nciso_version" value="2.4.8" />
  </group>
  <variable name="time_bnds" shape="time tbnds" type="double">
    <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>
  <variable name="v_TFA" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="pg/m3" />
    <attribute name="ancillary_variables" value="v_TFA_qc v_TFA_ebasmetadata" />
    <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="2025-12-22T09:24:51.000000Z" />
    <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="1w" />
    <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" />
    <attribute name="ebas_station_gaw_type" value="G" />
    <attribute name="ebas_station_wmo_region" type="long" value="4" />
    <attribute name="ebas_station_latitude" type="double" value="82.4991455078" />
    <attribute name="ebas_station_longitude" type="double" value="-62.3415260315" />
    <attribute name="ebas_station_altitude" value="210.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="TFA" />
    <attribute name="ebas_unit" value="pg/m3" />
    <attribute name="ebas_matrix" value="air+aerosol" />
    <attribute name="ebas_laboratory_code" value="CA01L" />
    <attribute name="ebas_instrument_type" value="high_vol_sampler" />
    <attribute name="ebas_instrument_name" value="HVPS1" />
    <attribute name="ebas_analytical_laboratory_code" value="CA01L" />
    <attribute name="ebas_analytical_measurement_technique" value="UHPLC-MS/MS" />
    <attribute name="ebas_analytical_instrument_name" value="LC-Exploris_A" />
    <attribute name="ebas_analytical_instrument_manufacturer" value="Thermo Scientific+Thermo Scientific" />
    <attribute name="ebas_analytical_instrument_model" value="Vanquish+Orbitrap Exploris 240" />
    <attribute name="ebas_analytical_instrument_serial_number" value="8336461+MM10383C" />
    <attribute name="ebas_method_ref" value="CA01L_UHPLC-MSMS" />
    <attribute name="ebas_filter_description" value="Whatman GF/C" />
    <attribute name="ebas_medium" value="Glass fiber+PUF+XAD+PUF" />
    <attribute name="ebas_sample_preparation" value="ASE+Methanol+13C" />
    <attribute name="ebas_blank_correction" value="Not blank corrected" />
    <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="AMAP_public" />
    <attribute name="ebas_framework_name" value="" />
    <attribute name="ebas_framework_description" value="" />
    <attribute name="ebas_framework_contact_name" value="Wenche Aas" />
    <attribute name="ebas_framework_contact_email" value="waa@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Hung, Hayley, , , , , , , , , &quot;" />
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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 framework: AMAP_public." />
    <attribute name="ebas_comment" value="Analyzed in-house by Organic Analysis Laboratory" />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasandparticletrifluoroaceticacidmassconcentration" />
    <attribute name="actris_variable_preferred_term" value="gas and particle trifluoroacetic acid mass concentration" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasandparticlephase" />
    <attribute name="actris_matrix_preferred_term" value="gas and particle phase" />
    <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/highvolumefiltersampler" />
    <attribute name="actris_instrument_type_preferred_term" value="high volume filter sampler" />
    <attribute name="actris_framework_uri" value="https://vocabulary.actris.nilu.no/actris_controlled_lists/AMAP" />
    <attribute name="actris_framework_preferred_term" value="AMAP" />
    <attribute name="actris_temporal_resolution" value="P14D" />
    <attribute name="actris_access_restriction" type="long" value="0" />
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  <variable name="qc_TFA" shape="qc_TFA_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_TFA" 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 1900-01-01T00:00:00Z" />
    <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" />
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