Energetic processes regulating the strength of MJO circulation over the Maritime Continent during two types of El Ni?o

被引：1

作者：

HSU PangChi ^{[1
,2
,3
]}

FU Zhen ^{[1
,2
,3
]}

XIAO Ting ^{[4
]}

机构：

[1] Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology

[2] Joint International Research Laboratory of Climate and Environment Change, Nanjing University of Information Science & Technology

[3] Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology

[4] Guangzhou Meteorological Observatory

来源：

AtmosphericandOceanicScienceLetters | 2018年 / 11卷 / 02期

关键词：

MJO动能诊断; 中太平洋型和东太平洋型ELNi?o; 尺度相互作用;

D O I：

暂无

中图分类号：

P732 [海洋气象学];

学科分类号：

0706 ; 070601 ;

摘要：

不同类型的El Ni?o事件对海洋性大陆区域的MJO强度有显著的影响。其中,中太平洋型(CP)El Ni?o期间的秋冬季MJO环流在海洋性大陆区域变得更强。本文推导了新的MJO动能诊断方程,并以此来定量诊断两类El Ni?o期间调控海洋性大陆区域的MJO环流强度的物理过程。与EP El Ni?o相比,CP El Ni?o期间平均动能与MJO动能之间的正压能量转换增强。在CP El Ni?o期间,沃克环流在海洋性大陆区域出现上升异常、低层辐合和气旋异常,透过正压能量转换,MJO得以从平均气流场中获得较多的动能;并进一步透过斜压能量转换,来维持MJO自身的强度增长。CP El Ni?o期间,增强的MJO将其动能转给高频扰动,有利海洋性大陆区域的高频扰动发展。

引用

页码：112 / 119

页数：8

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