海陆风环流及其湍流特征模拟试验  

THE SIMULATION EXPERIMENT ON SEA-LAND BREEZE AND ITS TURBULENCE CHARACTERISTIC

作　　者：王卫国[1] 蒋维楣[1] 陈家华[2] 

机构地区：[1]南京大学大气科学系,南京210093 [2]江苏省气象局,南京210009

出　　处：《气象科学》1997年第1期52-57,共6页Journal of the Meteorological Sciences

基　　金：大气物理和大气化学重点实验室(LAPC)资助

摘　　要：本文建立了一个采用工程上实用的E－ε闭合方案的边界层模式。作为应用，模拟研究了海陆风环流、陆上和海上热力内边界层以及湍流特征。结果表明，海风环流中的湍流能量大于陆风环流中的。离岸不同距离处不仅湍流能量不同，而且影响其发展的主导因子也不同，岸边TIBL内由风切变支配，混合层内由浮力作用支配。陆上TIBL廓线不是光滑变化，其下风向伸展范围比夜间海上TIBL的大得多。地－气交换量与海风厚度和大小有关。文中还对几种晨间不同条件下的海陆风环流特征作了试验，结果与一般特性的观测事实一致。A two-dimenslonal nonlinear PBL numerical model,in which simple energy closure (E-ε) scheme is used and the ground temperature is computed through an energy budget equation,has been developed to study the sea-land breeze circulation,thermal internal boundarylayer on land in the daytime and over water at night and their turbulence characteristics. Results indicated that turbulence energy in sea-breeze circulation is greater than that in landbreeze circulatiOn. Not only turbulence energy but also the dominant factor of affecting itsvariation is different at different distance from shoreline. The variation of t urbulence energyis dominated by windshear in TIBL near shoreline, but by buoyancy in mixing layer. TheTIBL profile on land is not smooth curve. It extends downwind on land in the day furtherthan over water at night. The exchange between earth and atmosphere is related with thedepth of sea-breeze and wind velocity in the day. The other experimental conditions are usedto study sea -land circulation and turbulence, the comprehensive results obtained from simulation agree with those from observation summarized by prior author.

关 键 词：海风 陆风 环流 湍流特征 模拟试验 

分 类 号：P425.2[天文地球—大气科学及气象学] P425.41