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  <attribute name="Conventions" value="CF-1.8, ACDD-1.3" />
  <attribute name="featureType" value="timeSeries" />
  <attribute name="title" value="Ground based in situ observations of ammonia at De Zilk (NL0091R) using denuder" />
  <attribute name="keywords" value="NL0091R, air, CAMP, ammonia, De Zilk, EMEP" />
  <attribute name="id" value="NZQ9-YQPH.nc" />
  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="CAMP, EMEP" />
  <attribute name="acknowledgement" type="double" />
  <attribute name="doi" value="https://doi.org/10.48597/NZQ9-YQPH" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, DPJ Swart, DPJ Swart, ammonia - denuder at De Zilk, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/NZQ9-YQPH" />
  <attribute name="summary" value="Ground based in situ observations of ammonia at De Zilk (NL0091R) using denuder. These measurements are gathered as a part of the following projects CAMP, EMEP and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ammonia in air" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="NL01L, Rijks institut voor volksgezondheid en milieuhygiene, RIVM, Antoine van Leeuwenhoeklaan 9, Postbus 1, NL-3720 BA BILTHOVEN, The Netherlands" />
  <attribute name="date_created" value="2014-05-07T07:39:44 UTC" />
  <attribute name="date_metadata_modified" value="2014-05-07T07:39:44 UTC" />
  <attribute name="creator_name" value="Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, DPJ Swart, DPJ Swart" />
  <attribute name="creator_type" value="person" />
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  <attribute name="contributor_name" value="Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout" />
  <attribute name="contributor_role" value="data submitter, data submitter, data submitter, data submitter, data submitter, data submitter, data submitter, data submitter, data submitter, data submitter, 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" />
  <attribute name="publisher_url" value="https://www.nilu.no/" />
  <attribute name="geospatial_bounds" value="POINT Z (52.3 4.5 4.0)" />
  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
  <attribute name="geospatial_lat_min" type="double" value="52.3" />
  <attribute name="geospatial_lat_max" type="double" value="52.3" />
  <attribute name="geospatial_lon_min" type="double" value="4.5" />
  <attribute name="geospatial_lon_max" type="double" value="4.5" />
  <attribute name="geospatial_vertical_min" type="double" value="4.0" />
  <attribute name="geospatial_vertical_max" type="double" value="4.0" />
  <attribute name="geospatial_vertical_positive" value="up" />
  <attribute name="time_coverage_start" value="1996-01-01T00:00:00 UTC" />
  <attribute name="time_coverage_end" value="2011-01-01T00:00:00 UTC" />
  <attribute name="time_coverage_duration" value="P0015-00-00T00:00:00" />
  <attribute name="time_coverage_resolution" value="P0000-00-00T01:00:00" />
  <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="Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, DPJ Swart, DPJ Swart, ammonia - denuder at De Zilk, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/NZQ9-YQPH" />
  <attribute name="ebas_set_type_code" value="TU" />
  <attribute name="ebas_timezone" value="UTC" />
  <attribute name="ebas_file_name" value="NZQ9-YQPH.nc" />
  <attribute name="ebas_represents_doi" value="https://doi.org/10.48597/NZQ9-YQPH" />
  <attribute name="ebas_contains_doi" value="https://doi.org/10.48597/NZQ9-YQPH" />
  <attribute name="ebas_file_creation" value="2023-12-12T18:49:57.486363 UTC" />
  <attribute name="ebas_export_state" value="2016-12-15T11:54:37.740000 UTC" />
  <attribute name="ebas_export_filter" value="exclude-900,exclude-invalid" />
  <attribute name="ebas_startdate" value="19960101000000" />
  <attribute name="ebas_revision_date" value="20140507073944" />
  <attribute name="ebas_statistics" value="arithmetic mean" />
  <attribute name="ebas_period_code" value="15y" />
  <attribute name="ebas_resolution_code" value="1h" />
  <attribute name="ebas_station_code" value="NL0091R" />
  <attribute name="ebas_platform_code" value="NL0091S" />
  <attribute name="ebas_station_name" value="De Zilk" />
  <attribute name="ebas_station_latitude" value="52.3" />
  <attribute name="ebas_station_longitude" value="4.5" />
  <attribute name="ebas_station_altitude" value="4.0 m" />
  <attribute name="ebas_regime" value="IMG" />
  <attribute name="ebas_component" value="ammonia" />
  <attribute name="ebas_unit" value="ug N/m3" />
  <attribute name="ebas_matrix" value="air" />
  <attribute name="ebas_laboratory_code" value="NL01L" />
  <attribute name="ebas_instrument_type" value="denuder" />
  <attribute name="ebas_instrument_name" value="ECN_Amor_0091" />
  <attribute name="ebas_method_ref" value="NL01L_MIL-W-5500_NL01L_ILG-W-2900" />
  <attribute name="ebas_organization" value="NL01L, Rijks institut voor volksgezondheid en milieuhygiene, RIVM, , &quot;Antoine van Leeuwenhoeklaan 9, Postbus 1, NL-3720 BA BILTHOVEN, The Netherlands&quot;, , , , " />
  <attribute name="ebas_originator" value="Swart, DPJ, , , , , , , , , " />
  <attribute name="ebas_submitter" value="Berkhout, Jacobus P.J., , , , , , , , , " />
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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="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;Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Arien Stolk, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, Jacobus P.J. Berkhout, DPJ Swart, DPJ Swart, ammonia - denuder at De Zilk, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/NZQ9-YQPH&quot;,&#xA;    &quot;Set type code&quot;: &quot;TU&quot;,&#xA;    &quot;Timezone&quot;: &quot;UTC&quot;,&#xA;    &quot;File name&quot;: &quot;NZQ9-YQPH.nc&quot;,&#xA;    &quot;Represents DOI&quot;: &quot;https://doi.org/10.48597/NZQ9-YQPH&quot;,&#xA;    &quot;Contains data from DOI&quot;: &quot;https://doi.org/10.48597/NZQ9-YQPH&quot;,&#xA;    &quot;File creation&quot;: &quot;2023-12-12T18:49:57.486363 UTC&quot;,&#xA;    &quot;Export state&quot;: &quot;2016-12-15T11:54:37.740000 UTC&quot;,&#xA;    &quot;Export filter&quot;: &quot;exclude-900,exclude-invalid&quot;,&#xA;    &quot;Startdate&quot;: &quot;19960101000000&quot;,&#xA;    &quot;Revision date&quot;: &quot;20140507073944&quot;,&#xA;    &quot;Statistics&quot;: &quot;arithmetic mean&quot;,&#xA;    &quot;Period code&quot;: &quot;15y&quot;,&#xA;    &quot;Resolution code&quot;: &quot;1h&quot;,&#xA;    &quot;Station code&quot;: &quot;NL0091R&quot;,&#xA;    &quot;Platform code&quot;: &quot;NL0091S&quot;,&#xA;    &quot;Station name&quot;: &quot;De Zilk&quot;,&#xA;    &quot;Station latitude&quot;: &quot;52.3&quot;,&#xA;    &quot;Station longitude&quot;: &quot;4.5&quot;,&#xA;    &quot;Station altitude&quot;: &quot;4.0 m&quot;,&#xA;    &quot;Regime&quot;: &quot;IMG&quot;,&#xA;    &quot;Component&quot;: &quot;ammonia&quot;,&#xA;    &quot;Unit&quot;: &quot;ug N/m3&quot;,&#xA;    &quot;Matrix&quot;: &quot;air&quot;,&#xA;    &quot;Laboratory code&quot;: &quot;NL01L&quot;,&#xA;    &quot;Instrument type&quot;: &quot;denuder&quot;,&#xA;    &quot;Instrument name&quot;: &quot;ECN_Amor_0091&quot;,&#xA;    &quot;Method ref&quot;: &quot;NL01L_MIL-W-5500_NL01L_ILG-W-2900&quot;,&#xA;    &quot;Organization&quot;: &quot;NL01L, Rijks institut voor volksgezondheid en milieuhygiene, RIVM, , \&quot;Antoine van Leeuwenhoeklaan 9, Postbus 1, NL-3720 BA BILTHOVEN, The Netherlands\&quot;, , , , &quot;,&#xA;    &quot;Originator&quot;: &quot;Swart, DPJ, , , , , , , , , &quot;,&#xA;    &quot;Submitter&quot;: &quot;Berkhout, Jacobus P.J., , , , , , , , , &quot;&#xA;}" />
  <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="processing_level" value="processing_level_test" />
  <attribute name="_CoordSysBuilder" value="ucar.nc2.internal.dataset.conv.CF1Convention" />
  <dimension name="time" length="131496" />
  <dimension name="tbnds" length="2" />
  <dimension name="metadata_time" length="15" />
  <dimension name="ammonia_qc_flags" length="1" />
  <group name="CFMetadata">
    <attribute name="time_coverage_start" value="1996-01-01T00:30:00Z" />
    <attribute name="time_coverage_end" value="2010-12-31T23:30:00Z" />
    <attribute name="time_coverage_units" value="seconds" />
    <attribute name="time_coverage_resolution" value="3600.0" />
    <attribute name="time_coverage_duration" value="P0Y0M5478DT23H0M0.000S" />
  </group>
  <group name="NCISOMetadata">
    <attribute name="metadata_creation" value="2026-05-18" />
    <attribute name="nciso_version" value="2.4.8" />
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  <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="ammonia" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_ammonia_expressed_as_nitrogen_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="ug/m3" />
    <attribute name="ancillary_variables" value="ammonia_qc ammonia_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="20140507073944" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_station_code" value="NL0091R" />
    <attribute name="ebas_platform_code" value="NL0091S" />
    <attribute name="ebas_station_name" value="De Zilk" />
    <attribute name="ebas_station_latitude" value="52.3" />
    <attribute name="ebas_station_longitude" value="4.5" />
    <attribute name="ebas_station_altitude" value="4.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="ammonia" />
    <attribute name="ebas_unit" value="ug N/m3" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="NL01L" />
    <attribute name="ebas_instrument_type" value="denuder" />
    <attribute name="ebas_instrument_name" value="ECN_Amor_0091" />
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    <attribute name="ebas_organization" value="NL01L, Rijks institut voor volksgezondheid en milieuhygiene, RIVM, , &quot;Antoine van Leeuwenhoeklaan 9, Postbus 1, NL-3720 BA BILTHOVEN, The Netherlands&quot;, , , , " />
  </variable>
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    <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="ammonia_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" />
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  <variable name="metadata_time" shape="metadata_time" type="double">
    <attribute name="long_name" value="time of ebas metadata intervals" />
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    <attribute name="axis" value="T" />
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    <attribute name="bounds" value="metadata_time_bnds" />
    <attribute name="_CoordinateAxisType" value="Time" />
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