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摘要
The characteristics of the diurnal and seasonal variation of the radiation budget and the surface albedo of sunny day was analyzed based on the data collected during the source region of the Yellow River Maduo Xiang surface process observation test near-surface radiation budget observations, which was from June 1, 2014 to May 15, 2015. The result showed that in addition to atmospheric downward longwave radiation, downward solar radiation, ground upward shortwave radiation and upward longwave radiation have obvious diurnal variation. In terms of the annual average of daily amount, the ground upward longwave radiation (26.784 MJ/m2) is the largest, followed by the atmospheric longwave downward radiation (20.390 MJ/m2), followed by the downward shortwave radiation (17.539 MJ/m2), the ground upward shortwave radiation (3.888 MJ/m2) is the smallest. In different seasons, each component is minimal in winter, the first two components are the largest in spring and the last two components are the largest in summer. The diurnal and seasonal variation of the typical sunny surface albedo is "U" shape, and the annual average surface albedo was 0.18. The diurnal variation of the surface longwave effective radiation was evident. In the spring, fall and winter the difference between the diurnal averages are not evident. In the summer, it is slightly smaller. In different seasons, surface endothermic value is large and exist big numerical differences during the daytime, but exothermic value is small and exist small numerical differences, and maintain a long time (12-15 h) during the nighttime. The area is a strong heat source during the daytime, a weak cold source during the nighttime and generally a strong heat source.
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