夏季金塔地区绿洲环流的数值模拟  

Numerical Simulation of Local Circulation in Jinta Oasis in Summer

作　　者：陈世强[1] 文莉娟[1] 吕世华[1] 奥银焕[1] 张宇[1] 李锁锁[1] 

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

出　　处：《高原气象》2006年第1期66-73,共8页Plateau Meteorology

基　　金：国家自然科学基金重点项目(40233035)资助

摘　　要：利用中尺度模式MM5,模拟研究了晴天时不同背景风场作用下的不同绿洲冷岛效应的三个个例。模拟结果显示,在背景风较强时,绿洲向四周辐散的风场不易形成,但是冷中心依然存在,只是中心会被环境风场吹离绿洲,而后再逐渐生成;或有时仅生成向背景风垂直方向辐散的风场。在背景风相对较弱时,可清楚地看到绿洲风场逐渐形成及衰退的演变,环境风场与同它反向的辐散绿洲风间的交界是次序进退的。对于不同个例,温度场和湿度场同风场的配合也不太一致。Using the mesoscale model MM5, three cases of different background circulations were simulated. Their forms and development of oasis effect were analyzed. Simulated results showed the oasis divergent wind gone out of it wasn＇t easy to appear if the ambient wind field was strong. At the same time the cold center was blown away from the geographic center of the oasis and reappeared in the oasis after a period. Sometimes the wind influenced by the background circulation just diverged toward south and north sides of the background wind field. When the velocity of ambient wind was relatively small, the oasis-desert circulation gradually formed and the boundary obviously moved between the divergent oasis-desert wind and background wind field. Under different background wind field conditions, the oasis temperature and humidity centers didn＇t coincide with each other.

关 键 词：绿洲效应 背景场 金塔绿洲 MM5模式 

分 类 号：P434.5[天文地球—大气科学及气象学]