夏季金塔绿洲及邻近戈壁的冷湿舌及边界层特征分析

利用2004年7月金塔“绿洲系统能量与水分循环过程观测与数值研究”重点项目加强期系留梯度探测资料，对该绿洲边缘的冷湿舌现象及边界层特征进行了分析。结果表明，戈壁绿洲边缘的确存在冷湿舌；白天从09时至18时都有冷湿舌出现，高度一般维持在0～600m之间；冷湿舌受风速、风向、太阳对地面加热强度等因素的影响很大，也与午后绿洲辐散风有密切关系。这一发现对深入研究戈壁绿洲能量与水分循环，尤其是对绿洲与周围沙漠戈壁的水热交换研究具有重要意义，也为进一步研究绿洲的维持和发展提供了很好的基础。

Analyses of Cold-Wet Tongue and Boundary Layer Characteristic Inside and Outside of Jinta Oasis

Using the tethered balloon gradient data in Jinta during the intensive period of observation of oasis system energy and water cycle and numerical study in July 2004, the cold-wet tongue phenomenaand boundary layer character on the edge of the Oasis are analyzed. The results demonstrated thatthere are cold-wet tongue phenomenainside and outside the edge of the Oasis. Cold-wet tongue was appeared from 09:00 to 18:00, its height is about from 0 to 600 m. Cold-wet tongue is not only affected by wind speed and direction and the intensityof sun heating up the surface, but also affected by the divergence wind over the Oasisin the afternoon. The finding is very important to study energy and hydrologic cycle, especiallyto exchanges of moisture and heat in Gobi and Oasis regions. This work provide a good basisfor further study development and maintainof Jinta Oasis.