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    • In Situ Carbon Dioxide, Methane, and Carbon Monoxide Mole Fractions from the Los Angeles Megacity Carbon Project

    Metadata Updated: July 29, 2022

    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.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: See this page for license information.

    Downloads & Resources

    Dates

    Metadata Created Date May 17, 2021
    Metadata Updated Date July 29, 2022
    Data Update Frequency irregular

    Metadata Source

    Harvested from NIST

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date May 17, 2021
    Metadata Updated Date July 29, 2022
    Publisher National Institute of Standards and Technology
    Maintainer
    Identifier ark:/88434/mds2-2388
    Language en
    Data Last Modified 2021-05-03 00:00:00
    Category Environment:Greenhouse gas measurements
    Public Access Level public
    Data Update Frequency irregular
    Bureau Code 006:55
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id e50c6c37-3459-4a9b-9f5d-d35a06243d7c
    Harvest Source Id 74e175d9-66b3-4323-ac98-e2a90eeb93c0
    Harvest Source Title NIST
    License https://www.nist.gov/open/license
    Program Code 006:047
    Source Datajson Identifier True
    Source Hash 6cb97fe90019ad16eaaf041af80466074c195e82
    Source Schema Version 1.1
    Spatial Southern California, United States
    Temporal 2015-01-01/2019-12-31

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