The objectives of this study were to (1) compare
annual mass and energy fluxes of sensible carbon dioxide (CO2), heat
flux density (H), and latent heat flux density (LE) from Campbell Scientific,
Inc. (CSI) manufactured eddy
covariance (EC) and Bowen Ratio/energy balance (BREB) instrumentation in a
tallgrass prairie site and (2) make similar short term (5-14 d) comparison in
other grazing ecosystems throughout the western United States. The long-term
tallgrass prairie site was located in central Oklahoma
with measurements being made from August 2001- October 2004, while the
short-term sites were located in Oregon, Colorado, Idaho, North Dakota, and Arizona
during the summers of 2003 and 2005. Results from the long-term (< 36-month)
co-located EC and BREB units indicated that both systems demonstrated similar
seasonal patterns, yet the EC consistently failed to close the energy balance
by 25-35% when compared to the BREB.
Author: G.L. Doyle, W.A. Dugas, and H. Mayeux (jdoyle at grl dot ars dot usda dot gov)
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