Clouds have an impact on the climate in both positive and negative ways. In Logan, Utah, USA, a radiation station with two CM21 Kipp & Zonen pyranometers (one inverted) and two CG1 Kipp & Zonen pyrgeometers (one inverted) was set up to study these effects at the local scale. CV2 four The pyranometers and pyrgeometers were ventilated using Kipp & Zonen ventilation systems. The ventilation of pyranometers and pyrgeometers prevents the accumulation of dew, frost, and snow. would otherwise disrupt the measurement. Knowing that available energy (Rn) as Rn = Rsi － Rso + Rli－ Rlo where Rsi and Rso are downward and upward solar radiation, respectively, and Rli and Rlo as atmospheric and terrestrial, respectively, on a daily and annual basis, the consequences of cloudiness were assessed. The findings indicate that for the partly cloudy days of 4 and 5 September, 2007, cloudiness caused less available energy (Rn) in the amounts of -1.83 MJ·m-2·d-1 and -3.83 MJ·m-2·d-1 on these days, respectively. Because of the cloudiness at the experimental site, as illustrated,, the net radiation loss was 2,804 － 4,055 = -1,251 MJ·m-2·y-1, As a result of the cloudiness, this implies a negative feedback.
Dr. Esmaiel Malek
Department of Applied Aviation Science, Embry-Riddle Aeronautical University, 600 S. Clyde Morris Boulevard, Daytona Beach, FL 32114-3900, USA.
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