云南高原紫外辐射强度变化时空特征分析

对云南低纬高原地区不同海拔高度和经纬度站点的太阳紫外辐射强度观测资料进行了分析,讨论了紫外辐射强度在云南全境的时空分布特征。结果表明:①紫外辐射的基本变化主要受天文因子的影响,其一般变化特征与总辐射有良好的对应关系,具有明显的日变化和年变化。②紫外辐射强度受测站纬度的影响,随测站纬度的升高而减小,其同经度递减率为纬度每增加1°,紫外辐射强度干、雨季分别减小0.679W/m²和0.157W/m²;不同经度分别减小0.340W/m²和0.306W/m²,且紫外辐射强度随纬度的变化率干季大于雨季,具有明显的干雨季特征。③紫外辐射强度受测站海拔高度的影响,随测站海拔高度的增加而增加,其变化率为海拔高度每上升100m,紫外辐射强度干、雨季分别增加0.202W/m²、0.090W/m²,同样具有明显的干雨季特征。

Analysis of the Spatio-temporal Characteristics of UV-B Strength Change over the Yunnan Plateau

In this article,the UV-B data from different altitude,longitude and latitude stations on Yunnan low latitude plateau were analysed and the spatio-temporal characteristics of UV-B strength of Yunnan Province were discussed.The results indicate that:(1)The chronometer factors have an effect on the basic change of UV-B strength,the changing characteristics are directly related to the total radiation and have obvious daily and yearly variations.(2)The UV-B strength is affected by the latitude of the survey points.With the increase of latitude,the UV-B strength decreases.When the latitude rises 1o,the UV-B strength decreases 0.679 W/m² and 0.157 W/m² respectively in the dry and rainy season in the same longitude and decreases 0.340 W/m² and 0.306 W/m² in different longitude.The changing ratio of UV-B strength in dry season is larger than in the rainy season,having obvious dry-rainy season characteristics.(3)UV-B strength is affected by the altitude,with the increase of altitude of survey points,the UV-B strength increases.When the altitude increases 100m,the UV-B strength increases 0.202 W/m² and 0.090 W/m²respectively in the dry and rainy season,having also obvious dry-rainy season characteristics.