五道梁地区的太阳紫外辐射

THE SOLAR ULTRAVIOLET RADIATION OVER THE WUDAOLIANG REGION

该文利用１９９３年９月—１９９４年８月五道梁站的太阳辐射观测资料，分析了该地区太阳紫外辐射的气候学特征。结果表明：该地区的太阳紫外辐射年平均日总量为０．７３ＭＪ／ｍ２，小于拉萨地区，而大于高原东北侧的河西走廊地区；紫外辐射的瞬时极大值较大，７月份可达５６Ｗ／ｍ２，大于河西地区而略小于拉萨地区。其季节变化主要受大气相对质量和大气自氧总含量的影响。紫外辐射在总辐射中所占比例年平均值为４．３％，比河西和拉萨地区均大；其年变化特征与河西地区相反，但与高原其它地区相同。

In this paper, the climatological characteristics of solar ultraviolet radiation over the Wudaoliang region in Qinghai-Xizang Plateau are analysed based on the solar radiation data observed from September 1993 to August 1994. The results are as follows: the annual mean daily total of solar ultraviolet radiation is about 0.73MJ/m 2, less than that over Lhasa region and larger than that over HEIFE region. The instantaneous maximum of ultraviolet radiation is strong,its seasonal variation is influenced by relative atmospheric optical mass and ozone amount in atmosphere. The annual mean ratio of UV to Q is about 4.3%, larger than that over HEIFE and Lhasa region. The annual variation of UV over this region are the same as that over the rest region of the Plateau but opposite to the HEIFE region.