黑河实验区非均匀地表能量通量的数值模拟  

Numerical Simulation of Surface Energy Fluxes over Heterogeneous Land Surfaces in HEIFE Area

作　　者：阎宇平[1] 王介民[1] M.Menenti 苏中波 

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]Winand Staring Center

出　　处：《高原气象》2001年第2期132-139,共8页Plateau Meteorology

基　　金："国家重点基础研究发展规划"(G19980 40 90 0 )项目 ;欧盟CLIWARDA项目共同资助

摘　　要：利用三维非静力RAMS模拟研究了黑河实验区非均匀地表能量通量 ,模拟结果表明 :绿洲地表净辐射通量较沙漠戈壁大 ;绿洲及沙漠戈壁下垫面上的Bowen比分别为 0 .4和 4.0 ;夜间绿洲上整晚维持蒸发 ,并有负感热通量。模拟结果与测站实测结果及卫星反演值的对比研究指出 ,RAMS对绿洲下垫面潜热通量的模拟和对沙漠戈壁下垫面感热通量的模拟与实测基本一致。卫星遥感反演及数值模拟方法对净辐射的估算与实测较吻合 ,绿洲地表感热通量的卫星反演值较数值模拟结果更接近于实际 ,但潜热通量的模拟值则较卫星估算值更接近于实际 ;沙漠戈壁地表则是感热通量的模拟值较卫星反演值更接近于实际。上述分析为今后结合卫星遥感改进RAMS陆面过程参数化 。Surface energy fluxes are simulated using 3D nonhydrostatistical RAMS over heterogeneous land surfaces in HEIE area. It is showed that the net radiation over oasis is larger than that over desert/Gobi. The Bowen ratios are 0.4 and 4.0 over oasis and desert respectively. Evaporation can last in the whole night and there is negative sensible heat flux over oasis. At the same time, simulations are compared with observations andsatellite remote sensing retrieval. The simulated surface latent heat fluxes are more consistent with observations than that of sensible heat fluxes over oasis. The simulated sensible heat fluxes are more consistent with observationsthan that of latent heat fluxes over desert/Gobi. In general, the simulated and satellite retrieved net radiation are both in agreement with the observations. On oasis, the error of surface sensible heat fluxes retrieved from satellite is smaller than the simulations, but the simulated latent heat fluxes are more consistent with observations than those retrieved. However, on desert/Gobi, the simulated sensible heat fluxes are more consistent with observations than those of satellite retrievd.

关 键 词：RAMS 地表能量通量 卫星遥感反演 黑河实验区 数值模拟 

分 类 号：P425.23[天文地球—大气科学及气象学] P435