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D2423-1headline bar  Bill Kustas checking the position of a water vapor/carbon dioxide sensor on a micrometeorological tower.

**Image Number D2423-1** Bill Kustas, ARS hydrologist at Beltsville, MD, checks the position of a water vapor/carbon dioxide (CO2)sensor on a micrometeorological tower. The instrument measures the exchange of water, energy, and CO2 between the soil-plant system and the lower atmosphere. Photo by Peggy Greb. 640 pixels wide: (D2423-1.jpg)   Please visit our Image Gallery.


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