内蒙古半干旱区近地层总体输送系数特征  

Characteristics of Surface Layer Bulk Transfer Coefficients over SemiArid Region of Inner Mongolia

作　　者：周玺康 郭建侠[3] 王英舜[4] 武魁[4] 

机构地区：[1]南京信息工程大学 [2]中国人民解放军75240部队 [3]中国气象局气象探测中心 [4]内蒙古锡林浩特国家气候观象台

出　　处：《气象科技》2013年第3期537-543,共7页Meteorological Science and Technology

基　　金：中国气象局气候变化专项(编号:CCSF2011-23)资助

摘　　要：利用内蒙古锡林浩特2009年1月至2010年12月通量观测系统资料,用涡动相关法计算分析了湍流交换参数变化特征。结果表明,草原下垫面动量输送系数(Cd)和热量输送系数(Ch)存在相同的季节变化和不同的日变化特征,夏季最大,冬季最小,Cd的日变化为单峰型,而Ch多为双峰型;Cd随高度增加而减小,Ch仅在夏季随高度增加而减小;Cd和Ch在不稳定情况下均随风速增大而减小,而在稳定情况下,Ch随风速无明显变化,Cd先随风速增大而减小,当风速大于6m/s时随风速增大而增大并趋于常值。逆温条件下,Cd和Ch随温差的减小而增大,反之,Cd随温差增大而增大,Ch与温差呈明显反比例变化特征。Based on the data of turbulence flux observed from January 2009 to December 2010 at the Xilinhot National Climate Observatory, the bulk transfer coefficients for momentum and heat are estimated by using the eddy-correlation method. The results show that bulk transfer coefficients for momentum （Ca） and heat （Ch） exhibit obvious same seasonal variation and different diurnal variation. The seasonal variation was the strongest in summer and the weakest in winter. The diurnal cycle of Ca showed a single peak, while Ch showed double peaks. With the increase of height the Cd decreased, but the Ch decreased with the increase of height only in summer. In the unstable atmosphere, both Cd and Ch decreased with the increasing wind speed. While in the stable atmospheric condition, Ca decreased with the wind speed if under 6 m/s, then increased with the wind speed if over 6 m/s. But CH had no obvious trend with the wind speed. As the surface was colder than the air, Ca and Ch increased with the decrease of temperature difference between surface and air. On the contrary, the larger the temperature difference the stronger the Cd, and the Ch was inversely proportional to the variation of temperature difference.

关 键 词：涡动相关法 总体输送系数 半干旱区 

分 类 号：P404[天文地球—大气科学及气象学]