河西地区绿州和沙漠的紫外总辐射

SOLAR ULTRAVIOLET RADIATION OVER OASES AND DESERT IN HEIFE AREA

利用１９９１年“黑河地区地一气相互作用的观测实验研究”期间在甘肃河西走廊张掖站（绿州）和沙漠站（沙漠）太阳紫外总辐射观测资料，分析了两站紫外总辐射的变化特征，并进一步讨论了云状况（云量、云状）对紫外总辐射的影响。

The observational data at Zhangye (oases) and Desert station during the Heihe Experimental period(1991)are used to analyse the variation characteristics of solar ultraviolet radiation (UV). The relation between UV and global radiation is given. We also have discussed the effect of cloud on UV. The results show that the diurnal and seasonal variation are obvious. and the correlations between UV and global radiation are very high at both stations. The UV values decrease with the increasing of cloud cover. especially cloud cover is more than or equal to 9. The effect of cloud type on UV is greater for low cloud (Sc) and less for high cloud (Ci)