摘要
利用美国科罗拉多州立大学和MRC/ASTER发展的中尺度数值模式RAMS(Regional Atmos-pheric Modeling System),设计了有、无湖对比模拟试验,以NCEP再分析资料作为初始条件和边界条件进行了120h的三重嵌套模拟试验。结果表明,模式的模拟性能良好。模拟的大气边界层特征显示,由于扎陵湖、鄂陵湖的存在,白天(夜晚)具有很好的降温(保温)作用,并表现出明显的冷(暖)湖效应;在白天(夜晚)扎陵湖、鄂陵湖有明显的湖(陆)风效应;在两湖之间的陆地低层有辐合和风切变,且鄂陵湖西岸的湖风比扎陵湖东岸的强,削弱了扎陵湖东岸的湖风;扎陵湖、鄂陵湖使得白天湖区的边界层顶低,周边陆地区域的边界层顶高,夜间则相反;扎陵湖、鄂陵湖对感热和潜热的影响有很强的日变化,白天湖面的感热小于周围陆地,夜间湖面的潜热则大于周围陆地。
To study the characteristics of atmospheric boundary layer over Lake Gyaring and Ngoring, a set of three nested numerical simulations with and without both the lakes were conducted 120 h using the mesoscale numerical model RAMS. The simulated results are reasonable comparing with the observation data. The obtained results are as follows： （1） The existence of both the lakes have a strong cold （warm） lake effect over the lake region in daytime （night time）. （2） The lake-land breeze simulated with RAMS is reasonable. （3） There is a clear convergence zone over the narrow land between the two lakes, and the strong lake breeze of the west shore of Lake Ngoring reduced the one of east shore of Lake Gyaring. （4） Lake Gyaring and Ngoring reduced （enhanced） the boundary layer height over the lake during daytime （night）. （5） Lake Gyaring and Ngoring significantly altered the surface energy flux, where the sensible heat flux is lower over the lakes than the surrounding land in daytime and the latent heat flux is higher over the lakes at night.
出处
《高原气象》
CSCD
北大核心
2012年第4期927-934,共8页
Plateau Meteorology
基金
国家自然科学基金重点项目(41130961)资助
关键词
冷湖效应
湖陆风
嵌套数值模拟
扎陵湖和鄂陵湖
Cold lake effect
Lake-land breeze
Nested numerical simulation
Lake Gyaring andNgoring
