西风带阻塞高压形成及崩溃动力机制的Euler-Lagrange理论解释  

Euler-lagrange theoretical explanation of dynamic mechanism about formation and breakdown of atmosphere blocking in westerly zone

作　　者：刘春 张春辉 刘自牧 叶秣麟 LIU Chun;ZHANG Chunhui;LIU Zimu;YE Molin(Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province,Chengdu 610072,China;Liaoyang Meteorological Bureau,Liaoning Liaoyang 111010,China;Neijiang Meteorological Bureau,Sichuan Neijiang 641000,China;Sichuan Meteorological Service Center,Chengdu 610072,China)

机构地区：[1]高原与盆地暴雨旱涝灾害四川省重点实验室,成都610072 [2]辽阳市气象局,辽宁辽阳111010 [3]四川省内江市气象局,四川内江641000 [4]四川省气象服务中心,成都610072

出　　处：《气象科学》2023年第3期384-392,共9页Journal of the Meteorological Sciences

基　　金：国家自然科学基金资助项目(41675095,41730959)。

摘　　要：本文主要采用Euler-Lagrange理论,讨论正压剪切流的切变参数对阻塞高压形成的影响。研究表明:存在一个临界参数,当切变参数的绝对值超过这个临界参数,正压剪切流将分歧出阻塞流型,这意味着阻塞高压的形成;反之,当切变参数的绝对值小于这个临界参数,阻塞流型将恢复到剪切流,这意味着阻塞高压的崩溃。该研究一定程度回答了阻塞流型“怎么形成”和“怎么崩溃”这一基本而关键的问题。This study discussed the influence of shear parameters of the barotropic shear flow on the formation of blocking,from the perspective of the local characteristics of the blocking.Studies have shown that there is a critical parameter,and when the absolute value of the shear parameter exceeds this critical parameter,the barotropic shear flow will bifurcate the blocking,which means the formation of blocking;on the contrary,when the absolute value of the shear parameter is less than this critical parameter,the blocking will return to shear flow,which means the collapse of the blocking.The research answers to a certain extent the basic and critical questions of“how to form”and“how to collapse”the blocking flow pattern.

关 键 词：Euler-Lagrange理论 阻塞形势 无穷维分歧理论 Banach空间 基本气流弱切变 二维正压原始方程 动力学机制 

分 类 号：P461[天文地球—大气科学及气象学]