- About Fluxnet
FLUXNET, a "network of regional networks," coordinates regional and global analysis of observations from micrometeorological tower sites (Figure 1). The flux tower sites use eddy covariance methods to measure the exchanges of carbon dioxide (CO2), water vapor, and energy between terrestrial ecosystems and the atmosphere.
At present over 500 tower sites are operated on a long-term and continuous basis (Figure 2). Vegetation under study includes temperate conifer and broadleaved (deciduous and evergreen) forests, tropical and boreal forests, crops, grasslands, chaparral, wetlands and tundra. Sites can be associated with regional or domain networks or can be unaffiliated. Flux towers operate on five continents and their latitudinal distribution ranges from 70 degrees north to 30 degrees south.
The FLUXNET database contains information about tower location and site characteristics as well as data availability (See FLUXNET Database). Eddy covariance data at 30-minute frequency are typically maintained, not by FLUXNET, but by individual towers or by networks to enable standardized data processing, gap-filling, and formats.
FLUXNET, which is a component of NASA's ORNL DAAC (Distributed Active Archive Center), has several primary functions:
In a related effort, the ORNL DAAC provides subsets of remote sensing products (MODIS Land Products) for an area 7 x 7 km around each flux tower in the FLUXNET collection. This information can be used as background site characteristic data, to examine ecosystem dynamics, to scale up the findings at tower sites, or to parameterize ecosystem models.
Chapin, F. S., III, W. Eugster, and J. P. McFadden. 2002. Arctic Tundra Flux Study in the Kuparuk River Basin (Alaska), 1994-1996. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/629.
Falge, E., M. Aubinet, P. Bakwin, D. Baldocchi, P. Berbigier, C. Bernhofer, A. Black, R. Ceulemans, A. Dolman, A. Goldstein, M. Goulden, A. Granier, D. Hollinger, P. Jarvis, N. Jensen, K. Pilegaard, G. Katul, P. Kyaw Tha Paw, B. Law, A. Lindroth, D. Loustau, Y. Mahli, R. Monson, P. Moncrieff, E. Moors, W. Munger, T. Meyers, W. Oechel, E. Schulze, H. Thorgeirsson, J. Tenhunen, R. Valentini, S. Verma, T. Vesala, and S. Wofsy. 2005. FLUXNET Marconi Conference Gap-Filled Flux and Meteorology Data, 1992-2000. Data set. Available on-line [http//www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/811.
Luyssaert, S., I. Inglima and M. Jung. 2009. Global Forest Ecosystem Structure and Function Data for Carbon Balance Research. Data set. Available on-line [http://daac.ornl.gov/] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/949.
Relationship of tower sites, regional networks, and FLUXNET, the global network of regional networks.