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    • Carbon Dioxide Mole Fraction Measurements and Model Output in the Northeast Corridor: Baltimore/Washington for February 2016

    Metadata Updated: September 30, 2025

    Dataset accompanying publication:Martin, C. R., Zeng, N., Karion, A., Mueller, K., Ghosh, S., Lopez-Coto, I., Gurney, K. R., Oda, T., Prasad, K., Liu, Y., Dickerson, R. R., and Whetstone, J.: Investigating sources of variability and error in simulations of carbon dioxide in an urban region, Atmos. Environ., https://doi.org/10.1016/j.atmosenv.2018.11.013, 2018.Data files presented here include both carbon dioxide (CO2) mole fraction observations from NIST-Earth Networks tower stations in the region surrounding Washington, D.C. and Baltimore, MD and modeled mole fractions for these same sites. Please refer to the publication above for all details, including locations of sites, and abbreviations of models and site codes. Observations from SNP are not included, as they can be obtained from NOAA/ESRL.Model Output Files:All files are comma-delimited text files. The filename indicates the site (three letter code: SNP, ARL, NDC, HAL), followed by the inlet height above ground (in meters), followed by the name of the inventory (Vulcan, ODIAC, ODIACFIX, EDGAR, FFDAS, VEGAS), or Back, indicating the incoming CO2 mole fraction background. The total modeled CO2 mole fractions, for example, for FFDAS, are the sum of Back, VEGAS, and FFDAS tracers.Example: HAL_29_FFDAS.csv contains the CO2 mole fraction contribution at HAL at 29m from the FFDAS inventory. The sum shown in the paper is HAL_29_FFDAS + HAL_29_Back + HAL_29_VEGAS.Model output files contain two columns:The date-time stamp (UTC), and the CO2 mole fraction in micromoles of CO2 per mole of dry air, or ppm.Observation Files:CO2 Measurements are reported on the WMO X2007 (CO2) scales. Refer to Verhulst et al, 2017 for measurement and calibration details.Verhulst, K. R., A. Karion, J. Kim, P. K. Salameh, R. F. Keeling, S. Newman, J. Miller, C. Sloop, T. Pongetti, P. Rao, C. Wong, F. M. Hopkins, V. Yadav, R. F. Weiss, R. M. Duren and C. E. Miller (2017), Carbon dioxide and methane measurements from the Los Angeles Megacity Carbon Project Part 1: calibration, urban enhancements, and uncertainty estimates, Atmos. Chem. Phys., 17(13), 8313-8341, doi:10.5194/acp-17-8313-2017.Each file name is encoded with the site, year, revision number and date, as follows:For all sites, all file names follow this naming scheme:[site]-[year]-[gas]-[measurement height]-[averaging-interval]-[revision date].csvExample: ARL-2016-co2-100m-1-hour-20160504.csvColumn Headers (with description) for observation CO2 files:datetime_UTC (date, dd-mm-yyyy HH:MM:SS)dec_year_UTC (decimal year)yyyy (year)mm (month)dd (day)HH (hour, UTC)co2_ppm (dry air mole fraction, ppm, averaged over the hour following the time stamp)co2_SD (standard deviation of air data in 1 hour)co2_n_minutes (number of 1-minute values in each 1-hour average)co2_min (ppm, minimum 1-min value in each 1-hour)co2_max (ppm, maximum 1-min value in each 1-hour)co2_uncertainty (ppm, 1-sigma measurement uncertainty)co2_flags (data quality flag: "..P" indicates preliminary data, which might change if a final calibration is applied at a later date)

    Access & Use Information

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

    Downloads & Resources

    References

    https://doi.org/10.1016/j.atmosenv.2018.11.013
    https://doi.org/10.5194/acp-17-8313-2017

    Dates

    Metadata Created Date November 12, 2020
    Metadata Updated Date September 30, 2025
    Data Update Frequency irregular

    Metadata Source

    Harvested from Commerce Non Spatial Data.json Harvest Source

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date November 12, 2020
    Metadata Updated Date September 30, 2025
    Publisher National Institute of Standards and Technology
    Maintainer
    Identifier 6A4D752E493C3B19E053245706819BFD1917
    Language en
    Data Last Modified 2018-11-05 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/catalog.jsonld
    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 7b224dda-1e25-47ea-a0d9-0ededf3f76f9
    Harvest Source Id bce99b55-29c1-47be-b214-b8e71e9180b1
    Harvest Source Title Commerce Non Spatial Data.json Harvest Source
    Homepage URL https://data.nist.gov/od/id/6A4D752E493C3B19E053245706819BFD1917
    License https://www.nist.gov/open/license
    Old Spatial -78.4, 38.4, -76.2, 39.6
    Program Code 006:047
    Related Documents https://doi.org/10.1016/j.atmosenv.2018.11.013, https://doi.org/10.5194/acp-17-8313-2017
    Source Datajson Identifier True
    Source Hash d9e74dfee19add4128e7eb55e19aa847a2e01871acce90e27b06a55de9c661ba
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -78.4, 38.4, -78.4, 39.6, -76.2, 39.6, -76.2, 38.4, -78.4, 38.4}
    Temporal 2016-02-01/2016-02-29

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