用改善的EVAD技术和变分法计算大气垂直速度  

Calculating Air Vertical Velocity Using the Modified EVAD Technique and the Variational Method

作　　者：胡志群[1] 夏文梅[2] 杨昌年[3] 梁明珠[4] 汤达章[4] 

机构地区：[1]南京信息工程大学江苏省气象灾害重点实验室 [2]江苏省气象科学研究所,江苏南京210008 [3]江苏省气象台,江苏南京210008 [4]南京信息工程大学大气科学系,江苏南京210044

出　　处：《南京气象学院学报》2005年第3期344-350,共7页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金资助项目(40475017);江苏省科技厅资助项目(BS2003054)

摘　　要：提出利用修正的Gram-Schmidt算法(MGS法)解决EVAD技术的求解问题,并通过2个实例。根据这2种改善的EVAD方法,分别计算出大气平均散度,再用变分法对散度值进行调整,然后利用连续方程,计算大气的垂直速度,并对各种结果进行了比较分析。The EVAD technique,which was presented by Srivastava,is often unsolvable because there usually exists sick matrix in practice.Thomas utilized the weighting function method to solve the problem.In this article,a modified Gram-Schmidt arithmetic(MGS) is introduced to solve the same problem.The atmospheric mean horizonal convergence in two examples is calculated using the two modified EVAD methods,the convergence obtained is then adjusted with the variational method,and the vertical velocity is computed in terms of the continuity equation.At last,various computed results are compared and analyzed.

关 键 词：多普勒雷达 EVAD技术 MGS法 变分法 大气垂直速度 

分 类 号：P412.25[天文地球—大气科学及气象学]