局地环流与大气边界层湍流相互作用的数值研究  

NUMERICAL STUDY ON THE INTERACTION BETWEEN LOCAL CIRCULATIONS AND TURBULENCE IN THE ATMOSPHERIC BOUNDARY LAYER

作　　者：齐瑛[1] 傅抱璞[1] 

机构地区：[1]南京大学大气科学系,江苏省南京市210008

出　　处：《高原气象》1992年第1期12-32,共21页Plateau Meteorology

摘　　要：本文建立了一个二维定常大气中尺度数值模式,并用该模式讨论了由下垫面粗糙度分布非均匀(局地动力强迫)和温度分布非均匀(局地热力强迫)而产生的局地大气环流与大气边界层湍流的相互作用。结果指出:下垫面存在温度分布非均匀时运动方程中的湍流交换项与水平气压梯度项一样可促使局地热力环流的形成,由粗糙度分布非均匀强迫产生的局地环流与由下垫面温度分布非均匀强迫产生的局地热力环流间的非线性相互作用是通过湍流交换实现的。A two-dimensional steady atmospheric mesoscale numerical model is developed in this paper. And the model is applied to study the interaction between the turbulence in the atmospheric boundary Layer and the local atmospheric circulations induced by the non-uniform surface roughness (local dynamic reinforcement) and temperature (local thermodynamic reinforcement). The conclusions as following are obtained. When the surface temperature is non-uniform, the turbulent mixing term in the equation of motion can cause local thermodynamic circulations as the horizontal pressure gradient term in the equation of motion. The nonlinear interaction between the local circulations induced by the non-uniform surface roughness and the local thermodynamic circulations induced by the non-uniform surface temperature is realized by the turbulent mixing.

关 键 词：局地环流 大气边界层湍流 大气环流 下垫面 数值模拟 粗糙度 

分 类 号：P425.2[天文地球—大气科学及气象学] P435