黑风暴的沙尘形成与输送参数化及中尺度数值试验

PARAMETERIZATION OF THE FORMATION AND TRANSPORTION FOR SAND DUST OF THE BLACK STORM AND MESOSCALE NUMERICAL EXPERIMENTS

中文关键词:  黑风暴  沙尘形成与输送  沙尘源和汇参数化  数值模拟

英文关键词:Blackstorm  Formation and transportion of sand-dust  Parameterization of sand-dustsource and sinkterms  Numerical simulation

中文摘要:

      西北地区典型黑风暴和强沙尘暴都是在特定大尺度环流背景和中尺度系统相互作用下发生和发展的,而中、低空强锋区相伴的强冷锋移经沙源充足的大沙漠区是黑风暴和强沙尘暴形成和发展的必要条件。为了研究黑风暴和沙尘暴的沙尘形成、输送及沉降机制,本文提出了一种沙尘源、汇项的参数化方案和一个沙尘输送方程,进而引入已有的MM4中尺度数值模式模拟系统;应用这个改进和发展的模式模拟系统基本成功地模拟了"93.5"黑风暴的天气系统演变及其沙尘浓度的近地层和垂直分布以及沙尘的沉降与输送。模拟结果分析表明,用包括沙尘输送方程及其沙尘源、汇项参数化方案的中尺度数值模式来研究黑风暴的沙尘形成、输送和沉降机制是一种具有应用前景的方法。

英文摘要:

      The results indicated that the typical black storm and severe sand-dust storm in the Northwest Region wereg enerated and developed under an interaction between the special large scale circulation pattern and meso scale systems,the severe cold front with intensive front zone on mid-and lower-levels moved along a huge of desert with abundant sand source to be a necessary condition for a black storm and a severe sand-dust storm.In order to study the mechanismon the formation and transpo rtion as well as sedimentation for sand-dust of the black storm and sand-dust storm,a parameter ized scheme of sand-dustsource and sink term and an equation of transporting sand-dust were achieved and posed,while both the scheme and the equation were introudced to the meso scale model and simulation system for MM4 which have been done.