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  <attribute name="Conventions" value="CF-1.8, ACDD-1.3" />
  <attribute name="featureType" value="timeSeries" />
  <attribute name="title" value="Pm25_mass at Wind Cave National Park-Elk Mountain" />
  <attribute name="summary" value="Pm25_mass at Wind Cave National Park-Elk Mountain. These measurements are gathered as a part of the following projects IMPROVE, sel_HTAP and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['pm25_mass in pm25 (mass_concentration_of_pm2p5_ambient_aerosol_particles_in_air)']" />
  <attribute name="keywords" value="&quot;Wind Cave National Park-Elk Mountain&quot; US4304R pm25_mass pm25 IMPROVE sel_HTAP mass_concentration_of_pm2p5_ambient_aerosol_particles_in_air" />
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  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="IMPROVE, sel_HTAP" />
  <attribute name="acknowledgement" value="" />
  <attribute name="doi" value="https://doi.org/10.48597/U7N7-MD9A" />
  <attribute name="license" value="Various, see detailed metadata" />
  <attribute name="citation" value="IMPROVE, sel_HTAP, 2019, Pm25_mass at Wind Cave National Park-Elk Mountain, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/U7N7-MD9A" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="US03L IMPROVE" />
  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2019-12-18T00:25:37.673000Z" />
  <attribute name="date_metadata_modified" value="2019-12-17T19:52:06Z" />
  <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 (-103.4835 43.5577 1311)" />
  <attribute name="geospatial_lat_min" type="double" value="43.5577" />
  <attribute name="geospatial_lat_max" type="double" value="43.5577" />
  <attribute name="geospatial_lon_min" type="double" value="-103.4835" />
  <attribute name="geospatial_lon_max" type="double" value="-103.4835" />
  <attribute name="geospatial_vertical_min" type="double" value="1311.0" />
  <attribute name="geospatial_vertical_max" type="double" value="1311.0" />
  <attribute name="geospatial_vertical_positive" value="up" />
  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
  <attribute name="time_coverage_start" value="2000-01-01T07:00:00Z" />
  <attribute name="time_coverage_end" value="2017-12-31T07:00:00Z" />
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  <attribute name="time_coverage_resolution" value="P0000-00-03T00:00:00" />
  <attribute name="timezone" value="UTC" />
  <attribute name="ebas_data_definition" value="EBAS_1.1" />
  <attribute name="ebas_data_license" value="" />
  <attribute name="ebas_citation" value="IMPROVE, sel_HTAP, 2019, Pm25_mass at Wind Cave National Park-Elk Mountain, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/U7N7-MD9A" />
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  <attribute name="ebas_contains_doi" value="https://doi.org/10.48597/U7N7-MD9A" />
  <attribute name="ebas_file_creation" value="2026-05-01T22:41:14.351078Z" />
  <attribute name="ebas_export_state" value="2019-12-18T00:25:37.673000Z" />
  <attribute name="ebas_export_filter" value="exclude-900,exclude-invalid" />
  <attribute name="ebas_startdate" value="2000-01-01T07:00:00.000000Z" />
  <attribute name="ebas_revision_date" value="2019-12-17T19:52:06.760000Z" />
  <attribute name="ebas_version" value="2" />
  <attribute name="ebas_version_description" value="Data extracted from http://views.cira.colostate.edu/fed/DataWizard 2019-12-16" />
  <attribute name="ebas_statistics" value="arithmetic mean" />
  <attribute name="ebas_data_level" value="2" />
  <attribute name="ebas_period_code" value="18y" />
  <attribute name="ebas_resolution_code" value="3d" />
  <attribute name="ebas_sample_duration" value="1d" />
  <attribute name="ebas_orig_time_res" value="3d" />
  <attribute name="ebas_station_code" value="US4304R" />
  <attribute name="ebas_platform_code" value="US4304S" />
  <attribute name="ebas_station_name" value="Wind Cave National Park-Elk Mountain" />
  <attribute name="ebas_station_latitude" type="double" value="43.5577" />
  <attribute name="ebas_station_longitude" type="double" value="-103.4835" />
  <attribute name="ebas_station_altitude" value="1311.0 m" />
  <attribute name="ebas_regime" value="IMG" />
  <attribute name="ebas_component" value="pm25_mass" />
  <attribute name="ebas_unit" value="ug/m3" />
  <attribute name="ebas_matrix" value="pm25" />
  <attribute name="ebas_laboratory_code" value="US03L" />
  <attribute name="ebas_instrument_type" value="filterpack" />
  <attribute name="ebas_instrument_name" value="filterpack_US4304" />
  <attribute name="ebas_method_ref" value="US03L_IMPROVE_Davis" />
  <attribute name="ebas_blank_correction" value="Blank corrected" />
  <attribute name="ebas_volume_std_temperature" value="ambient" />
  <attribute name="ebas_volume_std_pressure" value="ambient" />
  <attribute name="ebas_organization" value="US03L, IMPROVE, , , , , , , " />
  <attribute name="ebas_framework_acronym" value="IMPROVE, sel_HTAP" />
  <attribute name="ebas_framework_name" value="IMPROVE, HTAP Observation DB" />
  <attribute name="ebas_framework_description" value="http://vista.cira.colostate.edu/improve/Publications/OtherDocs/IMPROVEDataGuide/IMPROVEDataGuide.htm, HTAP Observation DB - selection of Datasets from other (primary) Projects" />
  <attribute name="ebas_framework_contact_name" value="Paul Eckhardt, Paul Eckhardt" />
  <attribute name="ebas_framework_contact_email" value="pe@nilu.no, pe@nilu.no" />
  <attribute name="ebas_originator" value="" />
  <attribute name="ebas_submitter" value="" />
  <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: IMPROVE, sel_HTAP." />
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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="2178" />
  <dimension name="tbnds" length="2" />
  <dimension name="metadata_time" length="18" />
  <dimension name="qc_pm25_mass_flags" length="1" />
  <group name="CFMetadata">
    <attribute name="time_coverage_start" value="2000-01-01T19:00:00Z" />
    <attribute name="time_coverage_end" value="2017-12-30T19:00:00Z" />
    <attribute name="time_coverage_units" value="seconds" />
    <attribute name="time_coverage_resolution" value="260866.0" />
    <attribute name="time_coverage_duration" value="P0Y0M6573DT0H0M0.000S" />
  </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_pm25_mass" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_pm2p5_ambient_aerosol_particles_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="ug/m3" />
    <attribute name="ancillary_variables" value="v_pm25_mass_qc v_pm25_mass_ebasmetadata" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="" />
    <attribute name="ebas_revision_date" value="2019-12-17T19:52:06.760000Z" />
    <attribute name="ebas_version" value="2" />
    <attribute name="ebas_version_description" value="Data extracted from http://views.cira.colostate.edu/fed/DataWizard 2019-12-16" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1d" />
    <attribute name="ebas_orig_time_res" value="3d" />
    <attribute name="ebas_station_code" value="US4304R" />
    <attribute name="ebas_platform_code" value="US4304S" />
    <attribute name="ebas_station_name" value="Wind Cave National Park-Elk Mountain" />
    <attribute name="ebas_station_latitude" type="double" value="43.5577" />
    <attribute name="ebas_station_longitude" type="double" value="-103.4835" />
    <attribute name="ebas_station_altitude" value="1311.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="pm25_mass" />
    <attribute name="ebas_unit" value="ug/m3" />
    <attribute name="ebas_matrix" value="pm25" />
    <attribute name="ebas_laboratory_code" value="US03L" />
    <attribute name="ebas_instrument_type" value="filterpack" />
    <attribute name="ebas_instrument_name" value="filterpack_US4304" />
    <attribute name="ebas_method_ref" value="US03L_IMPROVE_Davis" />
    <attribute name="ebas_blank_correction" value="Blank corrected" />
    <attribute name="ebas_volume_std_temperature" value="ambient" />
    <attribute name="ebas_volume_std_pressure" value="ambient" />
    <attribute name="ebas_organization" value="US03L, IMPROVE, , , , , , , " />
    <attribute name="ebas_framework_acronym" value="IMPROVE, sel_HTAP" />
    <attribute name="ebas_framework_name" value="IMPROVE, HTAP Observation DB" />
    <attribute name="ebas_framework_description" value="http://vista.cira.colostate.edu/improve/Publications/OtherDocs/IMPROVEDataGuide/IMPROVEDataGuide.htm, HTAP Observation DB - selection of Datasets from other (primary) Projects" />
    <attribute name="ebas_framework_contact_name" value="Paul Eckhardt, Paul Eckhardt" />
    <attribute name="ebas_framework_contact_email" value="pe@nilu.no, pe@nilu.no" />
    <attribute name="ebas_originator" value="" />
    <attribute name="ebas_submitter" value="" />
    <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: IMPROVE, sel_HTAP." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/aerosolparticlemassconcentration" />
    <attribute name="actris_variable_preferred_term" value="aerosol particle mass concentration" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/PM2.5" />
    <attribute name="actris_matrix_preferred_term" value="PM2.5" />
    <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/lowvolumefiltersampler" />
    <attribute name="actris_instrument_type_preferred_term" value="low volume filter sampler" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="P3D" />
    <attribute name="actris_access_restriction" type="long" value="1" />
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  <variable name="qc_pm25_mass" shape="qc_pm25_mass_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_pm25_mass" 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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