影响大气长波调整的因子分析  

Analysis on impacting factors of atmospheric long-wave

作　　者：张立凤[1] 黎爱兵[1] 高建华 

机构地区：[1]解放军理工大学气象学院,江苏南京211101 [2]解放军72517部队,山东济南250022

出　　处：《解放军理工大学学报（自然科学版）》2012年第4期460-465,共6页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(40975031)

摘　　要：为了分析影响大气长波调整的因子,揭示长波调整的机制和规律,以β平面准地转正压位势涡度方程为数学模型,通过数值计算的方法,研究了非线性、初始场、基流和纬度对大气长波调整的影响,并分析了真实基流下的长波调整情况。结果发现:长波纬向调整的出现与基流在y方向的结构无关,但长波调整出现的时间与调整结果与基流切变有关,非线性作用是长波调整的重要机制之一。长波调整出现时间和调整方向与初始波动结构、基流的分布和波动所处在的纬度有关,非线性Rossby波一般向低波调整,初始纬向波数越大,调整出现的时间越早,切变基流也能加速长波调整的出现;非线性Rossby波所处的纬度越高,其纬向波数变化越早且变化趋势越稳定。To study the impacting factors,mechanisms and the regularity of the adjustment of long-wave that is of great importance for improving weather and climate prediction,the numerical calculation method was adopted.The impact of nonlinearity,initial condition,basic flow（including real nonlinear flow） and latitude on adjustment of atmospheric long-wave was researched based on β plane quasi-geostrophic potential vorticity equation.The result indicates that the nonlinearity is a crucial mechanism leading to the adjustment of long-wave,and that there is no relationship between the zonal adjustment of long-wave and the basic flow structure along y-direction.When the adjustment of long-wave occurs,the trend of this adjustment is determined by the initial wave structures,the basic flow and the latitude parameter.The nonlinear Rossby wave is generally adjusted to low wave.The occurrence time of the adjustment starts earlier as the initial zonal wave-number increases,and it starts earlier as the shear in basic flow strengthens.The latitude also has an impact on adjustment of long-wave.The higher the latitude,the long-wave adjustment occurs earlier,and the attendant change of the zonal wavenumber is more stable.

关 键 词：大气长波 调整 非线性 影响因子 

分 类 号：P433[天文地球—大气科学及气象学]