摘要
根据作者提出的含边界层层结特征参数如层结稳定度、粗糙度等的Ekman抽吸速度公式 ,研究了稳定度、粗糙度、斜压性等参数对旋转减弱的影响。计算实例表明 ,稳定度影响旋转减弱最强 ,典型的不稳定情况旋转减弱进行的速度比稳定时大一个量级 ;粗糙度的影响主要表现于层结不稳定时 ,陆上要比海上快 2倍以上。斜压性在不稳定时也有影响 ,此外风速也是影响旋转减弱的主要因子。本文结论有助于边界层与自由大气间相互作用的认识 。
Based on the Ekman pumping formula which contains the PBL characteristic parameters such as stratification parameter, roughness, the effects of stratification parameters, roughness, baroclinic parameters etc on the spin-down process are studied The computations show that the effect of stratification parameter is most important, the rate of spin-down process in a typically unstable condition is one order of magnitude larger than that in a typically stable condition The effect of roughness mainly appears in unstable stratification, the rate of spin-down over land is about two times larger than that over sea The baroclinity also affects the spin-down slightly in unstable condition The wind speed is also an important factor The conclusion of this paper can increase the knowledge of the interaction between the PBL and free atmosphere, and may give some probable explanation of the maintenance and decay of some pressure system
出处
《大气科学》
CSCD
北大核心
2000年第2期173-176,共4页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金资助项目 !4 95752 4 8
