This type of experiment applies a heating treatment to open-field plant canopies, simulating models of future warmer conditions. Dr. Bruce Kimball of the Arid-Land Agricultural Research Center and colleagues design and operate such experiments. In 2005 they developed a proportional–integrative–derivative control system for controlling the rise in temperatures. Apogee IRT’s (upgraded later to IRR’s) provided the data on control and heated plot temperatures. Similar infrared warming experimentation using this design and Apogee sensors are also underway in Haibei, Qinghai, China and Cheyenne, WY .

Kimball, B. A., 2005.
Theory and performance of an infrared heater for ecosystem warming.
     Global Change Biology,
     11(11):2041-2056.