南极瑞穗站太阳分光辐射及大气透明状况

Solar Spectral Irradiances and State of Atmospheric Transparency over Mizuho Station in Antarctica

本文利用１９７９年—１９８０年南极瑞穗站太阳分光辐射资料￣［１－２］。统计分析了其太阳分光辐射特征及大气透明状况。初步结果表明：瑞穗站虽然地处高纬，因大气洁净仍有很强的太阳直接辐射能量；由于雪面的高反射率及大气的多次反射使得散射较大；直接太阳辐射、总辐射和反射辐射与ｓｉｎｈ有较好的线性关系；散射辐射及与总辐射比与太阳高度角和大气质量有关。文中还计算了瑞穗站的大气透明度系数，并与拉萨和北京的大气透明系数进行了比较。

In this paper,global G(λ)and reflected R(λ)spectral irradiances were measuredby EKo- MS800 pyranometers and direct spectral irradiance I(λ)was measured byEKO MS52f pyrheliometer set on the equatorial at the height of 1.5m above the snowsurface. They were measured using four (WS305,OG530, RG630 and RG695)cut offfilters. In this study, characteristics of direct,global, diffuse, reflected spectral irra- diances were analyze. The preliminary results show:(1) Though Mizuho station locatedat high latitude area of the southern hemispherel it still receives strong direct irradi-ance. The instantaneous maximum value of direct irradiance is higher than Lhasa at themiddle latitude areal that is indicated high transparency of atmosphere at Mizuhostation. (2) Direct, global and reflected spectral irradiances with solar elevation angleand relative atmospheric mass have good correlation.(3) Atmosphere transparency coef- ficient of over Mizuho station was calculated and compared with atmosphere transparencycoefficients of Lhasa and Beijing.