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  <attribute name="title" value="POPs (persistent organic pollutants) at Alert" />
  <attribute name="summary" value="POPs (persistent organic pollutants) 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: ['alpha_HCH in air+aerosol (mass_concentration_of_alpha_hexachlorocyclohexane_in_aerosol)', 'alpha_endosulfan in air+aerosol (mass_concentration_of_alpha_endosulfan_in_aerosol)', 'beta_endosulfan in air+aerosol (mass_concentration_of_beta_endosulfan_in_aerosol)', 'cis_CD in air+aerosol (mass_concentration_of_cis_chlordane_in_aerosol)', 'cis_NO in air+aerosol (mass_concentration_of_cis_nonechlor_in_aerosol)', 'dieldrin in air+aerosol (mass_concentration_of_dieldrin_in_aerosol)', 'endrin in air+aerosol (mass_concentration_of_endrin_in_aerosol)', 'gamma_HCH in air+aerosol (mass_concentration_of_gamma_hexachlorocyclohexane_in_aerosol)', 'methoxychlor in air+aerosol (mass_concentration_of_methoxychlor_in_aerosol)', 'mirex in air+aerosol (mass_concentration_of_mirex_in_aerosol)', 'octachlorostyrene in air+aerosol (mass_concentration_of_octachlorostyrene_in_aerosol)', 'op_DDE in air+aerosol (mass_concentration_of_op_dichlorodiphenyldichloroethylene_in_aerosol)', 'op_DDT in air+aerosol (mass_concentration_of_op_dichlorodiphenyltrichloroethane_in_aerosol)', 'oxychlordane in air+aerosol (mass_concentration_of_oxychlordane_in_aerosol)', 'pp_DDE in air+aerosol (mass_concentration_of_pp_dichlorodiphenyldichloroethylene_in_aerosol)', 'pp_DDT in air+aerosol (mass_concentration_of_pp_dichlorodiphenyltrichloroethane_in_aerosol)', 'trans_CD in air+aerosol (mass_concentration_of_trans_chlordane_in_aerosol)', 'trans_NO in air+aerosol (mass_concentration_of_trans_nonachlor_in_aerosol)', 'trichloroveratrole in air+aerosol (mass_concentration_of_trichloroveratrole_in_aerosol)']" />
  <attribute name="keywords" value="Alert CA0420G alpha_HCH alpha_endosulfan beta_endosulfan cis_CD cis_NO dieldrin endrin gamma_HCH methoxychlor mirex octachlorostyrene op_DDE op_DDT oxychlordane pp_DDE pp_DDT trans_CD trans_NO trichloroveratrole air+aerosol AMAP_public mass_concentration_of_alpha_hexachlorocyclohexane_in_aerosol mass_concentration_of_alpha_endosulfan_in_aerosol mass_concentration_of_beta_endosulfan_in_aerosol mass_concentration_of_cis_chlordane_in_aerosol mass_concentration_of_cis_nonechlor_in_aerosol mass_concentration_of_dieldrin_in_aerosol mass_concentration_of_endrin_in_aerosol mass_concentration_of_gamma_hexachlorocyclohexane_in_aerosol mass_concentration_of_methoxychlor_in_aerosol mass_concentration_of_mirex_in_aerosol mass_concentration_of_octachlorostyrene_in_aerosol mass_concentration_of_op_dichlorodiphenyldichloroethylene_in_aerosol mass_concentration_of_op_dichlorodiphenyltrichloroethane_in_aerosol mass_concentration_of_oxychlordane_in_aerosol mass_concentration_of_pp_dichlorodiphenyldichloroethylene_in_aerosol mass_concentration_of_pp_dichlorodiphenyltrichloroethane_in_aerosol mass_concentration_of_trans_chlordane_in_aerosol mass_concentration_of_trans_nonachlor_in_aerosol mass_concentration_of_trichloroveratrole_in_aerosol" />
  <attribute name="id" value="9E23-KYTN.nc" />
  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="AMAP_public" />
  <attribute name="acknowledgement" value="" />
  <attribute name="doi" value="https://doi.org/10.48597/9E23-KYTN" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Hung, H., AMAP_public, 2025, POPs (persistent organic pollutants) at Alert, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/9E23-KYTN" />
  <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="2025-12-01T12:21:35.670704Z" />
  <attribute name="date_metadata_modified" value="2025-12-01T12:21:30Z" />
  <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/" />
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  <attribute name="geospatial_lon_max" type="double" value="-62.3415260315" />
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  <attribute name="geospatial_vertical_positive" value="up" />
  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
  <attribute name="time_coverage_start" value="2019-01-14T15:43:00Z" />
  <attribute name="time_coverage_end" value="2021-12-27T19:06:00Z" />
  <attribute name="time_coverage_duration" value="P0002-11-13T03:23:00" />
  <attribute name="time_coverage_resolution" value="P0000-00-21T00:00:00" />
  <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, POPs (persistent organic pollutants) at Alert, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/9E23-KYTN" />
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  <attribute name="ebas_file_creation" value="2026-05-21T22:27:52.015711Z" />
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  <attribute name="ebas_station_code" value="CA0420G" />
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  <attribute name="ebas_station_name" value="Alert" />
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  <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" />
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  <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_unit" value="pg/m3" />
  <attribute name="ebas_matrix" value="air+aerosol" />
  <attribute name="ebas_laboratory_code" value="CA01L" />
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  <attribute name="ebas_analytical_measurement_technique" value="GC-MS/MS" />
  <attribute name="ebas_analytical_instrument_name" value="B_GCMSMS_3" />
  <attribute name="ebas_analytical_instrument_manufacturer" value="Agilent+Agilent" />
  <attribute name="ebas_analytical_instrument_model" value="7890A+7000 Triple Quadrupole" />
  <attribute name="ebas_analytical_instrument_serial_number" value="CN_12511194" />
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  <attribute name="ebas_filter_description" value="Whatman GF/C" />
  <attribute name="ebas_medium" value="Glass fiber+PUF+PUF" />
  <attribute name="ebas_sample_preparation" value="Soxhlet+Hexane+13C+Silica" />
  <attribute name="ebas_blank_correction" value="Not blank corrected" />
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  <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="Analytical laboratory Freshwater Institute (FWI) changed to National Laboratory for Environmental Testing (NLET) starting in 2002" />
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  <attribute name="geospatial_lat_units" value="degrees_north" />
  <attribute name="geospatial_lon_units" value="degrees_east" />
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  <attribute name="history" value="None" />
  <attribute name="creator_url" value="ebas.nilu.no" />
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  <dimension name="time" length="53" />
  <dimension name="tbnds" length="2" />
  <dimension name="metadata_time" length="3" />
  <dimension name="qc_alpha_HCH_flags" length="1" />
  <dimension name="qc_alpha_endosulfan_flags" length="1" />
  <dimension name="qc_beta_endosulfan_flags" length="1" />
  <dimension name="qc_cis_CD_flags" length="1" />
  <dimension name="qc_cis_NO_flags" length="1" />
  <dimension name="qc_dieldrin_flags" length="1" />
  <dimension name="qc_endrin_flags" length="1" />
  <dimension name="qc_gamma_HCH_flags" length="1" />
  <dimension name="qc_methoxychlor_flags" length="1" />
  <dimension name="qc_mirex_flags" length="1" />
  <dimension name="qc_octachlorostyrene_flags" length="1" />
  <dimension name="qc_op_DDE_flags" length="1" />
  <dimension name="qc_op_DDT_flags" length="1" />
  <dimension name="qc_oxychlordane_flags" length="1" />
  <dimension name="qc_pp_DDE_flags" length="1" />
  <dimension name="qc_pp_DDT_flags" length="1" />
  <dimension name="qc_trans_CD_flags" length="1" />
  <dimension name="qc_trans_NO_flags" length="1" />
  <dimension name="qc_trichloroveratrole_flags" length="1" />
  <group name="CFMetadata">
    <attribute name="time_coverage_start" value="2019-01-18T03:28:00Z" />
    <attribute name="time_coverage_end" value="2021-12-24T05:34:30Z" />
    <attribute name="time_coverage_units" value="seconds" />
    <attribute name="time_coverage_resolution" value="1779653.0" />
    <attribute name="time_coverage_duration" value="P0Y0M1071DT2H6M30.000S" />
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    <attribute name="metadata_creation" value="2026-07-07" />
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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>
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    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_alpha_hexachlorocyclohexane_in_aerosol" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="pg/m3" />
    <attribute name="ancillary_variables" value="qc_alpha_HCH meta_alpha_HCH" />
    <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_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" />
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    <attribute name="ebas_station_land_use" value="Military reservation" />
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    <attribute name="ebas_comment" value="Analytical laboratory Freshwater Institute (FWI) changed to National Laboratory for Environmental Testing (NLET) starting in 2002" />
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    <attribute name="cell_methods" value="time: mean" />
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    <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="alpha_endosulfan" />
    <attribute name="ebas_unit" value="pg/m3" />
    <attribute name="ebas_matrix" value="air+aerosol" />
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    <attribute name="ebas_blank_correction" value="Not blank corrected" />
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    <attribute name="standard_name" value="mass_concentration_of_op_dichlorodiphenyldichloroethylene_in_aerosol" />
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