一个新的Ekman泵公式在大气边界层Ekman垂直速度计算中的应用  

Characteristics of Ekman Vertical Velocity of the Atmospheric Boundary Layer Calculated with a New Ekman Pumping Formula

作　　者：杨磊[1] 谭本馗[1] 

机构地区：[1]北京大学物理学院大气科学系,暴雨与旱涝灾害教育部重点实验室,北京100871

出　　处：《北京大学学报（自然科学版）》2004年第5期766-773,共8页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家自然科学基金资助项目 (4 0 2 75 0 1 2 )

摘　　要：利用GCM模式资料和Tan最新得到的具有复杂边界的层结大气边界层的Ekman泵公式 ,计算了大气边界层顶的Ekman垂直速度。结果表明 ,除青藏高原外 ,一般地区的大气边界层顶垂直速度的量级为每秒零点几厘米。在青藏高原地区 ,大气边界层顶的垂直速度可达每秒几厘米的量级 ,其分布类型在冬季和夏季显著不同 ,与该地区的盛行风系紧密相关。将新的Ekman泵公式的结果与经典的Ekman泵公式的计算结果进行比较 。Ekman vertical velocity of atmospheric boundary layer was calculated by using GCM data and the new Ekman Pumping formula given by Tan(2000),in which complex boundary was included for stratified atmosphere.The results show:(1) the vertical velocity of atmospheric boundary layer in most areas is about 10 -3 ?m/s,but the velocity over Tibetan Plateau can reach 10 -2 ?m/s; (2) the distribution of vertical velocity over Tibetan Plateau during winter is significantly different from that in summer,which is closely related to the dominant winds over this area.The characteristics of the Ekman vertical velocity obtained here with the new Ekman Pumping formula are compared with those obtained with the classic formula.

关 键 词：Ekman泵 大气边界层 非均匀边界层 

分 类 号：P424[天文地球—大气科学及气象学]