Atlantic blocking events in a simplified nonlinear baroclinic model for local finite-amplitude wave activity  

作　　者：Ning Shi Bamidele Abiodun Paul Wencai Liu 

机构地区：[1]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,School of Atmospheric Sciences,Nanjing University of Information Science and Technology,Nanjing,China [2]Nigerian Meteorological Agency,Abuja,Nigeria

出　　处：《Atmospheric and Oceanic Science Letters》2024年第4期41-45,共5页大气和海洋科学快报（英文版）

基　　金：This work was jointly supported by the National Natural Science Foundation of China[grant numbers 42088101 and 41975063].

摘　　要：为研究北大西洋阻高的形成机制,本文在局部有限振幅波活动(LWA)框架下进行了一系列数值实验.采用的数值模型能显式地描绘出两种重要的大气内部动力过程,即非线性纬向位涡通量和Rossby波包传播.模拟结果显示,这两种动力学过程均是形成大西洋阻高的重要机理.具体地,非线性纬向位涡通量和Rossby波包传播,分别是大西洋阻高南部和北部LWA形成的主导因子.因此,本研究综合了前人关于大西洋阻高的研究成果,为其形成机理提供了新的认识.To better understand the mechanisms underlying the formation of blocking highs over the North Atlantic as a type of large-amplitude disturbance,this paper reports results from numerical experiments within the framework of local finite-amplitude wave activity(LWA).The numerical model employed in this study explicitly depicts two important atmospheric internal dynamic processes-nonlinear zonal eddy flux and Rossby wave packet propagation-which have been individually emphasized by different previous studies.The simulation results reveal that these two dynamic processes are the dominant contributors to the formation of Atlantic blocking cases.However,they exert different influences over different regions.The southern and northern parts of the primary LWA associated with the blocking cases are mainly induced by the nonlinear zonal eddy flux and Rossby wave packet propagation,respectively.Thus,this study reconciles and integrates insights from previous studies on Atlantic blocking events,providing a cohesive understanding of their formation.

关 键 词：斜压模式 局地有限振幅波活动 罗斯贝波传播 非线性效应 

分 类 号：P731[天文地球—海洋科学]