Observations of carbon dioxide (CO2), methane (CH4), and carbon monoxide (CO) mole fractions from the Los Angeles Megacity Carbon Project

Description

Updated April 2025. Here we provide hourly observations of carbon dioxide (CO2), methane (CH4), and carbon monoxide (CO) mole fractions in dry air from tower- and rooftop-based sites in the Los Angeles Megacity Carbon Project network. Each *.tgz (tar/gzip) archive contains data files for a given site location, named by its 3-letter code. To extract *.tgz files on a unix platform, use "tar -xvzf ". Data files with in the -1-hr-CSV.tgz archives are comma delimited (CSV) 1-hour averages; data files within the _1-hr-NC.tgz archives are 1-hour averages in NetCDF format; data files within the -1-min-CSV.tgz are CSV files with 1-minute averages (there is no NetCDF version for 1-minute data). Site locations, heights, and other information are in a separate ascii (CSV) file (LAM_sites.csv), and also within each data file (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 the 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 (1Readme_v20250425.txt and 1Readme_1minfiles_v20250425.txt) contain data details; Updates_v20250425.pdf includes additional information on updates since the previous data version. Note about calibrations: CO2 data are reported on the NOAA/WMO X2019 calibration scale. CH4 data are reported on the NOAA/WMO X2004A calibration scale; CO data, where available, are reported on the NOAA/WMO X2014 scale. Note that previous archive s of this data reported CO2 on the X2007 scale. This data is being freely distributed for research, academic and related non-commercial purposes consistent with NIST's mandate to further the science and the promulgation of appropriate standards. Current update: April 25, 2025.

Resources

Name Format Description Link
19 CIT-1-hr-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/CIT-1-hr-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/CIT-1-hr-CSV.tgz.sha256
19 CIT-1-hr-NC.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/CIT-1-hr-NC.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/CIT-1-hr-NC.tgz.sha256
19 CIT-1-min-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/CIT-1-min-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/CIT-1-min-CSV.tgz.sha256
19 CNP-1-hr-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/CNP-1-hr-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/CNP-1-hr-CSV.tgz.sha256
19 CNP-1-hr-NC.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/CNP-1-hr-NC.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/CNP-1-hr-NC.tgz.sha256
19 CNP-1-min-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/CNP-1-min-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/CNP-1-min-CSV.tgz.sha256
19 COM-1-hr-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/COM-1-hr-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/COM-1-hr-CSV.tgz.sha256
19 RAN-1-min-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/RAN-1-min-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/RAN-1-min-CSV.tgz.sha256
19 COM-1-hr-NC.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/COM-1-hr-NC.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/COM-1-hr-NC.tgz.sha256
19 COM-1-min-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/COM-1-min-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/COM-1-min-CSV.tgz.sha256
19 FUL-1-hr-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/FUL-1-hr-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/FUL-1-hr-CSV.tgz.sha256
19 FUL-1-hr-NC.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/FUL-1-hr-NC.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/FUL-1-hr-NC.tgz.sha256
19 FUL-1-min-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/FUL-1-min-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/FUL-1-min-CSV.tgz.sha256
19 GRA-1-hr-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/GRA-1-hr-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/GRA-1-hr-CSV.tgz.sha256
19 GRA-1-hr-NC.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/GRA-1-hr-NC.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/GRA-1-hr-NC.tgz.sha256
19 GRA-1-min-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/GRA-1-min-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/GRA-1-min-CSV.tgz.sha256
19 IRV-1-hr-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/IRV-1-hr-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/IRV-1-hr-CSV.tgz.sha256
19 IRV-1-hr-NC.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/IRV-1-hr-NC.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/IRV-1-hr-NC.tgz.sha256
19 IRV-1-min-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/IRV-1-min-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/IRV-1-min-CSV.tgz.sha256
19 LJO-1-hr-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/LJO-1-hr-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/LJO-1-hr-CSV.tgz.sha256
19 LJO-1-hr-NC.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/LJO-1-hr-NC.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/LJO-1-hr-NC.tgz.sha256
19 LJO-1-min-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/LJO-1-min-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/LJO-1-min-CSV.tgz.sha256
19 ONT-1-hr-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/ONT-1-hr-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/ONT-1-hr-CSV.tgz.sha256
19 ONT-1-hr-NC.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/ONT-1-hr-NC.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/ONT-1-hr-NC.tgz.sha256
19 ONT-1-min-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/ONT-1-min-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/ONT-1-min-CSV.tgz.sha256
19 RAN-1-hr-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/RAN-1-hr-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/RAN-1-hr-CSV.tgz.sha256
19 RAN-1-hr-NC.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/RAN-1-hr-NC.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/RAN-1-hr-NC.tgz.sha256
19 SCI-1-hr-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/SCI-1-hr-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/SCI-1-hr-CSV.tgz.sha256
19 SCI-1-hr-NC.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/SCI-1-hr-NC.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/SCI-1-hr-NC.tgz.sha256
19 SCI-1-min-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/SCI-1-min-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/SCI-1-min-CSV.tgz.sha256
19 USC-1-hr-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/USC-1-hr-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/USC-1-hr-CSV.tgz.sha256
19 USC-1-hr-NC.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/USC-1-hr-NC.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/USC-1-hr-NC.tgz.sha256
19 USC-1-min-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/USC-1-min-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/USC-1-min-CSV.tgz.sha256
19 VIC-1-hr-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/VIC-1-hr-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/VIC-1-hr-CSV.tgz.sha256
19 VIC-1-hr-NC.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/VIC-1-hr-NC.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/VIC-1-hr-NC.tgz.sha256
19 VIC-1-min-CSV.tgz https://data.nist.gov/od/ds/ark:/88434/mds2-3814/VIC-1-min-CSV.tgz
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/VIC-1-min-CSV.tgz.sha256
33 1Updates_LAM_v20250425.pdf https://data.nist.gov/od/ds/ark:/88434/mds2-3814/1Updates_LAM_v20250425.pdf
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/1Updates_LAM_v20250425.pdf.sha256
33 Standard_Deviation_Calculation.pdf https://data.nist.gov/od/ds/ark:/88434/mds2-3814/Standard_Deviation_Calculation.pdf
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/Standard_Deviation_Calculation.pdf.sha256
47 1Readme_1minfiles_v20250425.txt https://data.nist.gov/od/ds/ark:/88434/mds2-3814/1Readme_1minfiles_v20250425.txt
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/1Readme_1minfiles_v20250425.txt.sha256
47 1Readme_v20250425.txt https://data.nist.gov/od/ds/ark:/88434/mds2-3814/1Readme_v20250425.txt
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/1Readme_v20250425.txt.sha256
8 LAM_sites.csv https://data.nist.gov/od/ds/ark:/88434/mds2-3814/LAM_sites.csv
47 https://data.nist.gov/od/ds/ark:/88434/mds2-3814/LAM_sites.csv.sha256

Tags

  • urban-emissions-modeling
  • carbon-dioxide
  • emissions-inventory
  • ghg-measurements
  • greenhouse-gases

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