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  <attribute name="Conventions" value="CF-1.8, ACDD-1.3" />
  <attribute name="featureType" value="timeSeries" />
  <attribute name="title" value="Methane at Boulder Reservoir" />
  <attribute name="summary" value="Methane at Boulder Reservoir. These measurements are gathered as a part of the following projects Independent and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['methane in air (mass_concentration_of_methane_in_air)', 'methane in air (mole_fraction_of_methane_in_air)']" />
  <attribute name="keywords" value="&quot;Boulder Reservoir&quot; US0109R methane air Independent mass_concentration_of_methane_in_air mole_fraction_of_methane_in_air" />
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  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="Independent" />
  <attribute name="acknowledgement" value="" />
  <attribute name="doi" value="https://doi.org/10.48597/GX7J-8YHD" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Helmig, D., Independent, 2025, Methane at Boulder Reservoir, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/GX7J-8YHD" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="US17L &quot;Boulder Atmosphere Innovation Research LLC&quot; &quot;Boulder AIR&quot; &quot;2820 Lafayette Drive&quot; 80305 Boulder USA" />
  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2025-05-26T09:24:15.495630Z" />
  <attribute name="date_metadata_modified" value="2025-05-21T22:09:28Z" />
  <attribute name="creator_name" value="Detlev Helmig" />
  <attribute name="creator_type" value="person" />
  <attribute name="creator_email" value="dh.bouldair@gmail.com" />
  <attribute name="creator_institution" value="&quot;Boulder Atmosphere Innovation Research LLC, Boulder AIR&quot;" />
  <attribute name="contributor_name" value="Detlev Helmig" />
  <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 (-105.2202 40.07 1586)" />
  <attribute name="geospatial_lat_min" type="double" value="40.07" />
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  <attribute name="geospatial_vertical_min" type="double" value="1586.0" />
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  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
  <attribute name="time_coverage_start" value="2017-02-22T20:19:00Z" />
  <attribute name="time_coverage_end" value="2024-12-31T23:56:02Z" />
  <attribute name="time_coverage_duration" value="P0007-10-09T03:37:02" />
  <attribute name="time_coverage_resolution" value="P0000-00-00T00:00:750" />
  <attribute name="timezone" value="UTC" />
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  <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="ebas_citation" value="Helmig, D., Independent, 2025, Methane at Boulder Reservoir, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/GX7J-8YHD" />
  <attribute name="ebas_set_type_code" value="TI" />
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  <attribute name="ebas_file_creation" value="2026-05-21T16:51:58.620242Z" />
  <attribute name="ebas_export_state" value="2025-05-26T09:24:15.495630Z" />
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  <attribute name="ebas_startdate" value="2017-02-22T20:19:00.000000Z" />
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  <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="8y" />
  <attribute name="ebas_resolution_code" value="750s" />
  <attribute name="ebas_sample_duration" value="2s" />
  <attribute name="ebas_station_code" value="US0109R" />
  <attribute name="ebas_platform_code" value="US0109S" />
  <attribute name="ebas_station_name" value="Boulder Reservoir" />
  <attribute name="ebas_station_state_province" value="CO" />
  <attribute name="ebas_station_land_use" value="Remote park" />
  <attribute name="ebas_station_setting" value="Suburban" />
  <attribute name="ebas_station_latitude" type="double" value="40.07" />
  <attribute name="ebas_station_longitude" type="double" value="-105.2202" />
  <attribute name="ebas_station_altitude" value="1586.0 m" />
  <attribute name="ebas_measurement_height" value="4.7 m" />
  <attribute name="ebas_regime" value="IMG" />
  <attribute name="ebas_component" value="methane" />
  <attribute name="ebas_matrix" value="air" />
  <attribute name="ebas_laboratory_code" value="US17L" />
  <attribute name="ebas_instrument_type" value="online_gc" />
  <attribute name="ebas_instrument_name" value="SRI_GC1" />
  <attribute name="ebas_instrument_manufacturer" value="SRI" />
  <attribute name="ebas_instrument_model" value="SRI-310 GC/FID" />
  <attribute name="ebas_instrument_serial_number" value="N4602" />
  <attribute name="ebas_method_ref" value="US17L_SRI_CH4" />
  <attribute name="ebas_calibration_scale" value="WMO CH4 X2004" />
  <attribute name="ebas_calibration_standard_id" value="Manufacturer: NOAA Global Monitoring Division (GMD), Batch: CA03334; CA06236" />
  <attribute name="ebas_inlet_type" value="Hat or hood" />
  <attribute name="ebas_inlet_description" value="Downward facing with hood" />
  <attribute name="ebas_inlet_tube_material" value="Teflon" />
  <attribute name="ebas_inlet_tube_length" value="8.0 m" />
  <attribute name="ebas_measurement_uncertainty_expl" value="Total uncertainty for data up to 30 April 2024: 0.31%. For data from 1 May to 31 December 2024: 0.52%." />
  <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
  <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
  <attribute name="ebas_framework_acronym" value="Independent" />
  <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
  <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
  <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
  <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
  <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
  <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&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: Independent. The monitoring program was funded by Boulder County with additional support by City of Boulder and Colorado Department of Public Health and Environment." />
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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="287927" />
  <dimension name="tbnds" length="2" />
  <dimension name="metadata_time" length="1" />
  <dimension name="qc_methane_mg_per_m3_flags" length="1" />
  <dimension name="qc_methane_nmol_per_mol_flags" length="1" />
  <group name="CFMetadata">
    <attribute name="time_coverage_start" value="2017-02-22T20:19:00Z" />
    <attribute name="time_coverage_end" value="2024-12-31T23:56:01Z" />
    <attribute name="time_coverage_units" value="seconds" />
    <attribute name="time_coverage_resolution" value="860.0" />
    <attribute name="time_coverage_duration" value="P0Y0M2869DT3H37M0.001S" />
  </group>
  <group name="NCISOMetadata">
    <attribute name="metadata_creation" value="2026-07-07" />
    <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_methane_mg_per_m3" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_methane_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="mg/m3" />
    <attribute name="ancillary_variables" value="qc_methane_mg_per_m3 meta_methane_mg_per_m3" />
    <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="2025-05-21T22:09:28.000000Z" />
    <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="2s" />
    <attribute name="ebas_station_code" value="US0109R" />
    <attribute name="ebas_platform_code" value="US0109S" />
    <attribute name="ebas_station_name" value="Boulder Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Remote park" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.07" />
    <attribute name="ebas_station_longitude" type="double" value="-105.2202" />
    <attribute name="ebas_station_altitude" value="1586.0 m" />
    <attribute name="ebas_measurement_height" value="4.7 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="methane" />
    <attribute name="ebas_unit" value="mg/m3" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="online_gc" />
    <attribute name="ebas_instrument_name" value="SRI_GC1" />
    <attribute name="ebas_instrument_manufacturer" value="SRI" />
    <attribute name="ebas_instrument_model" value="SRI-310 GC/FID" />
    <attribute name="ebas_instrument_serial_number" value="N4602" />
    <attribute name="ebas_method_ref" value="US17L_SRI_CH4" />
    <attribute name="ebas_calibration_scale" value="WMO CH4 X2004" />
    <attribute name="ebas_calibration_standard_id" value="Manufacturer: NOAA Global Monitoring Division (GMD), Batch: CA03334; CA06236" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_inlet_tube_material" value="Teflon" />
    <attribute name="ebas_inlet_tube_length" value="8.0 m" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_measurement_uncertainty_expl" value="Total uncertainty for data up to 30 April 2024: 0.31%. For data from 1 May to 31 December 2024: 0.52%." />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&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: Independent. The monitoring program was funded by Boulder County with additional support by City of Boulder and Colorado Department of Public Health and Environment." />
    <attribute name="ebas_comment" value="A secondary calibration standard was run between each ambient sample until December 2018.  Since January 2019, the secondary standard was run every other ambient sample.  Secondary standards are quantified against primary standards that were obtained from the NOAA Global Monitoring Laboratory in Boulder, Colorado. Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on export from EBAS from 'nmol/mol' to 'mg/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.00072." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/methanemassconcentration" />
    <attribute name="actris_variable_preferred_term" value="methane mass concentration" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
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    <attribute name="actris_instrument_type_preferred_term" value="gas chromatograph, online" />
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  <variable name="meta_methane_mg_per_m3" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
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    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mole_fraction_of_methane_in_air" />
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    <attribute name="ancillary_variables" value="qc_methane_nmol_per_mol meta_methane_nmol_per_mol" />
    <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="2025-05-21T22:09:28.000000Z" />
    <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="2s" />
    <attribute name="ebas_station_code" value="US0109R" />
    <attribute name="ebas_platform_code" value="US0109S" />
    <attribute name="ebas_station_name" value="Boulder Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Remote park" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.07" />
    <attribute name="ebas_station_longitude" type="double" value="-105.2202" />
    <attribute name="ebas_station_altitude" value="1586.0 m" />
    <attribute name="ebas_measurement_height" value="4.7 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="methane" />
    <attribute name="ebas_unit" value="nmol/mol" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="online_gc" />
    <attribute name="ebas_instrument_name" value="SRI_GC1" />
    <attribute name="ebas_instrument_manufacturer" value="SRI" />
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    <attribute name="ebas_instrument_serial_number" value="N4602" />
    <attribute name="ebas_method_ref" value="US17L_SRI_CH4" />
    <attribute name="ebas_calibration_scale" value="WMO CH4 X2004" />
    <attribute name="ebas_calibration_standard_id" value="Manufacturer: NOAA Global Monitoring Division (GMD), Batch: CA03334; CA06236" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_inlet_tube_material" value="Teflon" />
    <attribute name="ebas_inlet_tube_length" value="8.0 m" />
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    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
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    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&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: Independent. The monitoring program was funded by Boulder County with additional support by City of Boulder and Colorado Department of Public Health and Environment." />
    <attribute name="ebas_comment" value="A secondary calibration standard was run between each ambient sample until December 2018.  Since January 2019, the secondary standard was run every other ambient sample.  Secondary standards are quantified against primary standards that were obtained from the NOAA Global Monitoring Laboratory in Boulder, Colorado. Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/methaneamountfraction" />
    <attribute name="actris_variable_preferred_term" value="methane amount fraction" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
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    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
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    <attribute name="actris_instrument_type_preferred_term" value="gas chromatograph, online" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT750s" />
    <attribute name="actris_access_restriction" type="long" value="0" />
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  <variable name="qc_methane_nmol_per_mol" shape="qc_methane_nmol_per_mol_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_methane_nmol_per_mol" 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" />
  </variable>
</netcdf>
