夏季不同天气背景条件下黑河中游不同下垫面的辐射特征

Characteristics of Radiation over Different Underlying Surfaces in Middle Heihe River Basin on Different Summer Synoptic Background

利用2005年"绿洲系统能量水分循环观测实验"(JTEX)获得的资料分析了夏季晴天和阴天西北干旱区金塔绿洲不同下垫面的辐射收支特征。结果表明:由于下垫面的水热特性不同,绿洲与沙漠、戈壁的辐射特征有很大差异,而沙漠和戈壁的差异则较小。相同天气背景条件下,不同下垫面的向下辐射基本一致,绿洲的向上辐射最小,净辐射最大。地表辐射特征会随天气状况有较大变化。

The data obtained from ＂The Oasis System Energy and Water Cycle Field Experiment＂ in Jinta Oasis （JTEX） in summer of 2005 were used to analyze the characteristics of the diurnal variation of surface radiation over different underlying surfaces in Jinta oasis in clear day and cloudy day. The results showed that the characteristics of radiation over oasis were different from those over desert and gobi due to different hydro-thermal features of surfaces. On same synoptic condition, the downward radiation over different underlying surfaces was almost same; the upward radiation was the smallest and the net radiation was the biggest over oasis. The characteristics of radiation were different with different synoptic conditions; the radiation value in clear day was bigger than that in cloudy day over same underlying surface.