Hourly observations of carbon dioxide (CO2) and methane (CH4) mole fractions in dry air from tower- and rooftop-based sites in the Los Angeles Megacity Carbon Project network (currently 11 stations, with a 12th to be added in 2022). Carbon monoxide (CO) observations exist at several stations in this network but are not included in this data release pending additional calibration verification. Please contact the authors for higher frequency data, which are available on request. Data files are comma delimited (CSV). Measurements of each species may be from two or more different heights above ground. Site locations, heights, and other information are in a separate ASCII (CSV) file (LAM_sites.csv). Data are reported for the years 2015-2020. An ASCII Readme file (LAM_Readme_2022) is also posted. CO2 data are reported on the NOAA/WMO X2007 calibration scale. A full revision on the NOAA/WMO X2019 scale for CO2 is forthcoming, and will be updated annually beginning with 2021 files; it will be linked here. CH4 data are reported on the NOAA/WMO X2004A calibration scale. The present revision contains no substantial changes from a prior release (R0) of these data for 2015 and 2016, formerly available at megacities.jpl.nasa.gov, other than minor revisions to concentrations from updated calibrations of standards and the addition of an uncertainty. Most recent update added data for 2020. A NOAA obspack-formatted netcdf archive is included here as well. It includes data from SCI and VIC only from 2015-2019 in NetCDF format for those users who would prefer that format. Current update: May 17, 2022.
About this Dataset
Title | In Situ Carbon Dioxide, Methane, and Carbon Monoxide Mole Fractions from the Los Angeles Megacity Carbon Project |
---|---|
Description | Hourly observations of carbon dioxide (CO2) and methane (CH4) mole fractions in dry air from tower- and rooftop-based sites in the Los Angeles Megacity Carbon Project network (currently 11 stations, with a 12th to be added in 2022). Carbon monoxide (CO) observations exist at several stations in this network but are not included in this data release pending additional calibration verification. Please contact the authors for higher frequency data, which are available on request. Data files are comma delimited (CSV). Measurements of each species may be from two or more different heights above ground. Site locations, heights, and other information are in a separate ASCII (CSV) file (LAM_sites.csv). Data are reported for the years 2015-2020. An ASCII Readme file (LAM_Readme_2022) is also posted. CO2 data are reported on the NOAA/WMO X2007 calibration scale. A full revision on the NOAA/WMO X2019 scale for CO2 is forthcoming, and will be updated annually beginning with 2021 files; it will be linked here. CH4 data are reported on the NOAA/WMO X2004A calibration scale. The present revision contains no substantial changes from a prior release (R0) of these data for 2015 and 2016, formerly available at megacities.jpl.nasa.gov, other than minor revisions to concentrations from updated calibrations of standards and the addition of an uncertainty. Most recent update added data for 2020. A NOAA obspack-formatted netcdf archive is included here as well. It includes data from SCI and VIC only from 2015-2019 in NetCDF format for those users who would prefer that format. Current update: May 17, 2022. |
Modified | 2021-05-03 00:00:00 |
Publisher Name | National Institute of Standards and Technology |
Contact | mailto:[email protected] |
Keywords | Greenhouse Gases , GHG Measurements , Urban Emissions Modeling , Carbon Dioxide , Methane |
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Site locations, heights, and other information are in a separate ASCII (CSV) file (LAM_sites.csv). Data are reported for the years 2015-2020. An ASCII Readme file (LAM_Readme_2022) is also posted. CO2 data are reported on the NOAA\/WMO X2007 calibration scale. A full revision on the NOAA\/WMO X2019 scale for CO2 is forthcoming, and will be updated annually beginning with 2021 files; it will be linked here. CH4 data are reported on the NOAA\/WMO X2004A calibration scale. The present revision contains no substantial changes from a prior release (R0) of these data for 2015 and 2016, formerly available at megacities.jpl.nasa.gov, other than minor revisions to concentrations from updated calibrations of standards and the addition of an uncertainty. Most recent update added data for 2020. A NOAA obspack-formatted netcdf archive is included here as well. It includes data from SCI and VIC only from 2015-2019 in NetCDF format for those users who would prefer that format. 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"application\/gzip" }, { "downloadURL": "https:\/\/data.nist.gov\/od\/ds\/ark:\/88434\/mds2-2388\/obspack_multi-species_1_test_lam_2022-05-19.nc.tar.gz.sha256", "mediaType": "text\/plain" }, { "downloadURL": "https:\/\/data.nist.gov\/od\/ds\/ark:\/88434\/mds2-2388\/LAM_sites.csv", "mediaType": "text\/csv" }, { "downloadURL": "https:\/\/data.nist.gov\/od\/ds\/ark:\/88434\/mds2-2388\/LAM_sites.csv.sha256", "mediaType": "text\/plain" } ], "bureauCode": [ "006:55" ], "modified": "2021-05-03 00:00:00", "publisher": { "@type": "org:Organization", "name": "National Institute of Standards and Technology" }, "theme": [ "Environment:Greenhouse gas measurements" ], "keyword": [ "Greenhouse Gases", "GHG Measurements", "Urban Emissions Modeling", "Carbon Dioxide", "Methane" ] }