赵鸣,钟世远,卞新棣. 1988. 非定常过程对大气边界层的内参数与风廓线的影响(二)[J]. 气象学报, 46(2):210-218, doi:10.11676/qxxb1988.026
非定常过程对大气边界层的内参数与风廓线的影响(二)
THE INFLUENCES OF NONSTATIONARY PROCESS ON THE INNER PARAMETERS AND WIND PROFILES IN THE PLANETARY BOUNDARY LAYER (Ⅱ)
投稿时间:1986-06-30  修订日期:1987-01-09
DOI:10.11676/qxxb1988.026
中文关键词:  
英文关键词:
基金项目:
作者单位
赵鸣 南京大学大气科学系 
钟世远 南京大学大气科学系 
卞新棣 南京大学大气科学系 
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中文摘要:
      本文用大气边界层运动方程的数值积分研究了当边界层顶风向不变但风速变化时对大气边界层的内参数u*/A(u*为摩擦速度,A为上界风速)和α角(地面风与上界风向的交角)的影响。设上界处风速随时间指数增加及减少,最后趋于定常。在大气正、斜压时,u*/A及α角的时间变化均是振幅衰减的振荡,最后趋于定常时相应的值。在时间变化过程中的任一时刻,内参数值与当上界条件取该时刻上界风时的定常解结果有一定的差别,严格说,定常时的内参数值并不能直接用于当上界风非定常时。本文还考虑了上界风速非定常对风廓线的影响。
英文摘要:
      In this paper,the effect of the variation of the wind speed at the top of PBL (the wind direction maintains a constant) on the inner parameters u*/A(the ratio of friction velocity to the wind speed at the top of PBL) and a(the angle between the wind direction near the ground and the wind direction at the top of PBL) are studied by means of the numerical solution of the motion equation in PBL.The wind speeds at the top of PBL increase and decrease as an exponential function of time and approach constant values.In the case of barotropic condition,the values of u*/A and a are taken the form of attenuated fluctuation and approach the values corresponding to the stationary solutions.At any time during the temporal variation process the values of inner parameters are different from that derived from the stationary solutions of PBL equations in which the value of A at that instant is taken as the upper boundary condition.Strictly,the inner parameters derived from the stationary condition should not applied directly to the case of nonstationary condition of wind speed at the top of PBL.The effects of the nonstationary process to the wind profiles are also discussed.
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