巴丹吉林沙漠夏季近地层微气象特征分析  

Analysis on Micrometeorology Characteristics in Surface Layer over Badan Jaran Desert in Summer

作　　者：奥银焕[1] 吕世华[1] 韩博[1] 李照国[1,2] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所寒旱区陆面过程与气候变化重点试验室,甘肃兰州730000 [2]中国科学院大学,北京100049

出　　处：《高原气象》2013年第6期1682-1691,共10页Plateau Meteorology

基　　金：国家自然科学基金项目(40975007;41205005);国家重点基础研究发展计划(973计划)项目(2009CB421402)

摘　　要：利用2009年夏季巴丹吉林沙漠陆气相互作用观测试验资料,分析了该地区的近地层微气象特征。结果表明:(1)夏季晴天条件下,沙漠区日平均波文比远大于沙湖区,沙湖区白天潜热较大,动量通量主要受风速切变控制,而沙漠区动量通量可能受到热力稳定度的控制;(2)在不稳定条件下沙漠区湍流强度均随风速增加而明显减小,当风速固定时,沙漠区湍流强度随着大气不稳定度的增加而增大,沙湖区湍流强度变化类似但不明显;(3)沙漠地表能量不平衡现象较为突出,加入浅层土壤热储存后,上午时段能量闭合率显著提高,沙漠土壤热储存在能量平衡中扮演着重要角色;(4)在沙湖区,白天气流辐散下沉、夜间辐合上升,形成典型的次级环流。A comprehensive field experiment of land-atmosphere interactions over Badan Jaran Desert in summer of 2009 was introduced. Some micrometeorological characteristics in the Surface Layer were analysed by using the preliminary data. The results show that： （1） For a summer fine weather, the Bowen ratio values in desert are more than that in desert lake region, and the latent heat is bigger in desert lake. As to the momentum flux, it is controlled mainly by wind shear in desert lake region but by atmospheric thermal stability in desert area. （2） In the desert, the turbulence intensity decreases significantly with increasing of wind speed under unstable conditions, on the other hand, it increases with decreasing of atmospheric stability when the wind speed is constant. In the desert lake region, the trend is similar to that, but not so significant. （3） As to the energy budget, and the energy imbalance is large in the observation in the desert, but the energy closure rate will increase significantly in the morning after the soil heat storage is considered, which shows that the energy storage in the shallow soil layer is very important to the imbalanced energy flux. （4） In the desert lake region, there is a typical secondary circulation that the downdraft prevails in daytime and the updraft in night.

关 键 词：观测试验 湍流 能量平衡 沙漠 

分 类 号：P463[天文地球—大气科学及气象学]