水汽和潜热释放对背风波影响的数值试验  

Effects of moisture and latent heat on lee waves

作　　者：臧增亮[1] 潘晓滨[1] 汪潮[1,2] 王劲[2] 

机构地区：[1]解放军理工大学气象学院 [2]94719部队气象台

出　　处：《气象科学》2012年第1期38-44,共7页Journal of the Meteorological Sciences

基　　金：国家自然科学基金资助项目(40705020);解放军理工大学气象学院基础理论研究基金项目

摘　　要：利用中尺度数值模式ARPS进行了理想场的数值模拟,分析研究了水汽和潜热释放对大气层结稳定度的影响以及其在背风波的发展和演变过程中的作用,研究发现,潜热释放对大气层结分布的影响要远大于水汽对大气层结分布的直接影响,如果没有潜热的释放,水汽对背风波的发展和演变的作用非常小,而潜热释放可以使湿层结稳定度急剧下降,迅速破坏原有的层结分布,使这个区域出现非拦截的强烈的垂直运动,波动的崩溃更加迅速和明显。但需要说明的是在试验中,将数值模式里控制潜热释放的参数设为:0、1/2、2的假定情况,则在实际的大气运动过程中是不可能存在的。Lee waves of moist air with different distribution of water vapor were simulated by the ARPS model.The influences of water vapor and latent heat on atmospheric stratification stability and the development and evolvement of lee waves were analyzed.Results show that latent heat of condensation plays an important role in the development of convective movements.The effect of latent heat of condensation on distribution characteristic of atmospheric stratification is greater than that direct effect induced by water vapor.The rapid fall of stratification stability and obvious breakage of original distribution of atmospheric stratification caused by the release of latent heat could give rise to strong vertical motion and breakdown of lee waves.It should be noted that the assumption that the parameter of latent heat control in the experiment was assigned to 0,1/2 and 2 could not be accepted in the actual movement.

关 键 词：背风波 水汽 潜热释放 大气稳定度 

分 类 号：P435.1[天文地球—大气科学及气象学]