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Public Domain Picture: d2423-1

Courtesy: US Department of Agriculture
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U.S. Department of Agriculture (USDA) Agriculture Research Service (ARS) hydrologist Bill Kustas checks the position of a water vapor/CO2 sensor on a micrometeorological tower At the OPE3 (Optimizing Production Inputs and Environmental Enhancement) study area in Beltsville, MD on Mar. 20, 2003. In combination with the adjacent sonic anemometer, which measures horizontal and vertical wind, these instruments measure the turbulent exchange of water, energy, and CO2 between the soil-plant system and the lower atmosphere and are used to evaluate the ALEXI computer model over different landscapes. USDA photo by Peggy Greb.
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May 20, 2014
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US Department of Agriculture

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US Department of Agriculture (Flickr Photostream)
External Site: US Department of Agriculture
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