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  "version": "1.0.2",
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  "title": "Observations of carbon dioxide (CO2), methane (CH4), and carbon monoxide (CO) mole fractions from the Los Angeles Megacity Carbon Project",
  "contactPoint": {
    "fn": "Anna Karion",
    "hasEmail": "mailto:anna.karion@nist.gov"
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  "modified": "2025-04-25 00:00:00",
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  "landingPage": "https://data.nist.gov/od/id/mds2-3814",
  "description": [
    "Updated April 2025. Here we provide hourly observations of carbon dioxide (CO2), methane (CH4), and carbon monoxide (CO) mole fractions in dry \n air from tower- and rooftop-based sites in the Los Angeles Megacity Carbon Project network. Each *.tgz (tar/gzip) archive contains data files \n for a given site location, named by its 3-letter code. To extract *.tgz files on a unix platform, use \"tar -xvzf <filename>\". Data files with \nin the <site>-1-hr-CSV.tgz archives are comma delimited (CSV) 1-hour averages; data files within the <site>_1-hr-NC.tgz archives are 1-hour \naverages in NetCDF format; data files within the <site>-1-min-CSV.tgz are CSV files with 1-minute averages (there is no NetCDF version for \n1-minute data). Site locations, heights, and other information are in a separate ascii (CSV) file (LAM_sites.csv), and also within each data file  \n(for the 1-hour averages files). We encourage the use of the locations within the hourly data files, as some locations may have changed during \nthe site lifetime and have duplicate entries in the site file. Data in this archive is for January 1 2015-January 31 2025. ASCII Readme files \n(1Readme_v20250425.txt and 1Readme_1minfiles_v20250425.txt) contain data details; Updates_v20250425.pdf includes additional information on \nupdates since the previous data version. Note about calibrations: CO2 data are reported on the NOAA/WMO X2019 calibration scale. CH4 data are \nreported on the NOAA/WMO X2004A calibration scale; CO data, where available, are reported on the NOAA/WMO X2014 scale. Note that previous archive \ns of this data reported CO2 on the X2007 scale. This data is being freely distributed for research, academic and related non-commercial \npurposes consistent with NIST's mandate to further the science and the promulgation of appropriate standards. Current update: April 25, 2025."
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  "keyword": [
    "Greenhouse Gases",
    "GHG Measurements",
    "Urban Emissions Modeling",
    "Carbon Dioxide",
    "Emissions Inventory"
  ],
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      "@type": "Concept",
      "scheme": "https://data.nist.gov/od/dm/nist-themes/v1.1",
      "tag": "Environment: Greenhouse gas measurements"
    }
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  "accessLevel": "public",
  "license": "https://www.nist.gov/open/license",
  "publisher": {
    "name": "National Institute of Standards and Technology",
    "@type": "org:Organization"
  },
  "language": [
    "en"
  ],
  "bureauCode": [
    "006:55"
  ],
  "programCode": [
    "006:052"
  ],
  "theme": [
    "Environment: Greenhouse gas measurements"
  ],
  "references": [
    {
      "@type": [
        "npg:Document"
      ],
      "@id": "#ref:10.5194/acp-17-8313-2017",
      "refType": "IsSupplementTo",
      "location": "https://doi.org/10.5194/acp-17-8313-2017",
      "_extensionSchemas": [
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      ],
      "title": "Carbon dioxide and methane measurements from the Los Angeles Megacity Carbon Project \u2013 Part\u00a01: calibration, urban enhancements, and uncertainty estimates",
      "issued": "2017-07-07",
      "citation": "Verhulst, K. R., Karion, A., Kim, J., Salameh, P. K., Keeling, R. F., Newman, S., Miller, J., Sloop, C., Pongetti, T., Rao, P., Wong, C., Hopkins, F. M., Yadav, V., Weiss, R. F., Duren, R. M., & Miller, C. E. (2017). Carbon dioxide and methane measurements from the Los Angeles Megacity Carbon Project \u00e2\u0080\u0093 Part\u00c2\u00a01: calibration, urban enhancements, and uncertainty estimates. Atmospheric Chemistry and Physics, 17(13), 8313\u00e2\u0080\u00938341. https://doi.org/10.5194/acp-17-8313-2017\n"
    }
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  "rights": "Non-commercial use only",
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