ISLSCP Initiative II

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Carbon Data

FLUXNET CO₂ Flux Measurements: Harvard Forest and Northern BOREAS Flux Tower Sites

FLUXNET is a global network of micrometeorological tower sites that use eddy covariance methods to measure the exchanges of carbon dioxide (CO₂), water vapor, and energy between terrestrial ecosystem and atmosphere. Its goals are to understand the mechanisms controlling the flows of CO₂, water and energy to and from the terrestrial biosphere across the spectrum of time and space scales, and to provide ground information for validating estimates of net primary productivity, evaporation and energy absorption that are being generated by sensors mounted on the NASA TERRA satellite.
      At present, over 170 tower sites are operating on a long-term and continuous basis. Researchers also collect data on site vegetation, soil, hydrologic, and meteorological characteristics at the tower sites.
      Gap-filled flux data and meteorological data for half-hourly, daily, weekly, monthly, and annual time intervals are presented for each site and year. Selected gap-filling methods were used on both u* corrected data and data that had not been corrected for u*. The data have been processed from data kindly provided by investigators of the AmeriFlux and EUROFLUX projects, and are subject to change. Users are urged to communicate with the contributing investigators and are reminded that data, when used for publication, are subject to FAIR USE rules.

Data Provider: R.J. Olson, Dennis Baldocchi, Susan Holladay

Data Files (ISLSCP II Disc #1)

Data Set Documentation

File Information

The data format of meteorology variables in monthly and yearly files is standardized, and contains 3 data types: total (i.e. "tot" - day and nighttime), daytime ("day"), and nighttime ("night"). For each variable either sum or average/minimum/ maximum, percent of gaps filled and standard deviation (S.D.) are provided. The S.D. is the standard deviation calculated from the respective daily sum or daily mean. The data are comma-delimited, missing values are set to -9999. These files (along with the 0.5 hr data) are stored as a collection of files zipped together for a site-year. The files have been compressed using the PKZip program.

Related Pages:
    ISLSCP Initiative II Home
        General Data Overview
            Carbon Data Overview
                FLUXNET CO2 Flux Measurements

Revision Date: February 3, 2004