Continuous measurements of the surface energy balance components (net radiation R n , sensible heat flux H , latent heat flux LE, ground heat flux G , and CO 2 fluxes began in early June of 1995 at the Little Washita Watershed, near Chickasha, Oklahoma. A severe drought during 1998 provided a unique opportunity to evaluate the range of fluxes that can be expected during the summer period. Data obtained during four continuous summer periods were used to evaluate the year-to-year variability in summertime energy and CO 2 fluxes. During the summer period (day 150–240), total evapotranspiration for non-drought years ranged from 224 to 273 mm with a mean and standard error of 253±12 mm . The mean and standard error of the net ecosystem exchange (NEE) rate of carbon dioxide for the same summer period was −120±36 g C / m 2 . In a year with severe drought (1998) total evapotranspiration for the summertime period was 145 mm. The lack of precipitation during this time resulted in total losses to the atmosphere of 155 g C/m 2 from soil respiration.
Agricultural and Forest Meteorology – Elsevier
Published: Feb 3, 2001
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