金塔绿洲主要特征量的数值模拟  

Numerical Simulation of Primary Atmospheric Boundary Characteristics in Jinta Oasis,Gansu

作　　者：李万莉[1,2] 吕世华[1] 杨胜朋[1] 傅慎明[3] 符睿[4] 王大勇[5] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 [2]中国科学院研究生院,北京100049 [3]中国科学院大气物理研究所,北京100029 [4]云南省气象科学研究所,云南昆明650034 [5]山西省气候中心,山西太原030006

出　　处：《中国沙漠》2010年第5期1207-1214,共8页Journal of Desert Research

基　　金：国家自然科学基金重点项目(40633014)资助

摘　　要：采用RAMS模式模拟了金塔绿洲非均匀地表的空气温度、湿度、风速、地表能量。结果表明,绿洲地表温度明显比周围戈壁和沙漠低,空气湿度明显比周围戈壁和沙漠大,近地层感热通量最大值约为戈壁和沙漠的1/3,近底层潜热通量比戈壁和沙漠大20倍左右。模拟结果与观测值的对比表明,RAMS对绿洲、戈壁和沙漠不同下垫面近地面温度、湿度、感热通量和潜热通量的模拟与实测基本一致。由于湍流的随机性,风速的模拟偏差比较大,这种偏差有一多半是由于非线性偏差造成的。Air temperature, humidity, wind speed, surface energy over heterogeneous land surface in Jinta Oasis are simulated using RAMS. The results show that the near-surface temperature over oasis is obviously lower, and the near-surface atmospheric humidity over oasis is larger, compared with those over its surrounding Gobi and Desert. The sensible heat flux over oasis is only about 1/3 of that over Gobi and Desert, and the latent heat flux over oasis is 20 times larger than that over Gobi and Desert. Comparison of simulations and observations shows that the simulated air near-surface temperature, humidity, wind speed, sensible heat flux and latent heat flux are in agreement with the observed. The bias between simulated wind and observed wind velocity is relatively big because of randomicity of onflow, so the bias results mainly from nonlinear bias.

关 键 词：RAMS 非均匀地表 非线性偏差 

分 类 号：P435[天文地球—大气科学及气象学]