Diurnal and seasonal variations of UV radiation on the northern edge of the Qinghai-Tibetan Plateau
Diurnal and seasonal variations of UV radiation on the northern edge of the Qinghai-Tibetan Plateau
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青藏高原北缘紫外线辐射的日变化和季节变化
DOI：
10.1016/j.agrformet.2007.09.008
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发表时间：
2008-01-07
影响因子：
6.2
通讯作者：
Tang, Yanhong
中科院分区：
文献类型：
--
作者：
Cui, Xiaoyong;Gu, Song;Tang, Yanhong
2001年8月至2003年8月在青藏高原北方对UVA、UVB和太阳辐射进行了连续监测，以研究青藏高原紫外辐射的日变化和季节变化。臭氧总量测绘光谱仪（TOMS）估计的大气臭氧浓度降低和云覆盖减少时，UVB日辐射量和UVB占太阳总辐射的比例显著增加。当TOMS臭氧浓度在上午降低时，UVB/UVA比值也显示出显著的增加。UVB的季节变化与太阳高度密切相关，而受大气臭氧量的季节变化影响较小。与中央高原的观测结果相比，北方边缘由于臭氧消耗而导致的UVB增加幅度较小。研究表明，地面紫外辐射的时间变化是由太阳高度和臭氧量共同决定的，而高原上的空间差异则主要是由臭氧量的空间变化决定的。(c)2007年由Elsevier B. V.出版。
We monitored UVA, UVB, and solar radiation from August 2001 to 2003 on the northern Qinghai-Tibetan Plateau to characterize the diurnal and seasonal variations of UV radiation on the world's highest plateau. Daily UVB radiation and the ratio of UVB to total solar radiation increased significantly when the atmospheric ozone concentration decreased as estimated by the total ozone mapping spectrometer (TOMS), as well as when cloud coverage decreased. The UVB/UVA ratio also showed a significant increase when the TOMS ozone concentration decreased in the morning. The seasonal variation pattern of UVB, however, was closely correlated with solar elevation but was little affected by the seasonal pattern of the atmospheric ozone amount. Compared to observations from the central plateau, the magnitude of the UVB increase attributed to ozone depletion was smaller at the northern edge. The study suggests that the temporal variation of ground UV radiation is determined by both solar elevation and the ozone amount, but the spatial difference on the plateau is likely to be ascribed mainly to the spatial variation of the ozone amount. (c) 2007 Published by Elsevier B.V.