Characteristics of Scattered Radiation Change in Golmud
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Abstract:
By means of the observation data of the Golmud weather station from 1961 to 2012, the characteristics and impact factors of scattered radiation are studied. It is proved that scattered radiation showed a significant decreasing trend at Golmud in 52 years with a decrease rate of 9837 MJ/m2 per 10 years （〖WTBX〗P〖WTBZ〗<005）; the scattered radiation curve shows a unimodal trend with the annual maximum being 33332 MJ/m2, accounting for 13% in the annual total, and the minimum being 10835 MJ/m2， accounting for 4% in the annual total. The annual mean of scattered radiation is 261485 MJ/m2, accounting for 38% in the annual global radiation. The amount of scattered radiation in summer (1467 MJ/m2) is 22 times as great as that in winter (654 MJ/m2); the daily change curve of scattered radiation shows also a unimodal trend. The maximum appears around noon, and scattered radiation increases with the total cloud cover; the maximum appears along with cirrostratus and the minimum with cumulus; scattered radiation increases with the increase of solar elevation when there is snow, and the influence of ground snow cover on scattering radiation is mainly due to the increase of the scattered radiation reaching the ground induced by the multiple reflection on the surface and in the atmosphere.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.