Poleward expansion of the hadley circulation in CMIP5 simulations

被引：136

作者：

Hu Yongyun ^{[1
]}

Tao Lijun ^{[1
]}

Liu Jiping ^{[2
]}

机构：

[1] Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Sci, Beijing 100871, Peoples R China

[2] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China

来源：

ADVANCES IN ATMOSPHERIC SCIENCES | 2013年 / 30卷 / 03期

基金：

中国国家自然科学基金;

关键词：

global warming; Hadley circulation; increasing greenhouse gases; CMIP5; REANALYSIS;

D O I：

10.1007/s00376-012-2187-4

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Observational analyses have demonstrated that the Hadley circulation has expanded poleward in recent decades. Important issues are what caused the widening of the Hadley circulation and whether the observed widening is related to anthropogenic forcing. In the present study, we use currently available simulations of the Coupled Model Intercomparison Project Phase-5 (CMIP5) to analyze changes in the width of the Hadley circulation. It is found that CMIP5 historical simulations with greenhouse gas (GHG) forcing generate a total widening of similar to 0.15A degrees A +/- 0.06A degrees in latitude (10 yr)(-1) for the period 1979-2005, and the widening in CMIP5 historical simulations with all forcings is similar to 0.17A degrees +/- 0.06A degrees per decade. Similar to that in CMIP3, the simulated poleward expansion in CMIP5 is much weaker than the observational reanalyses. In CMIP5 projection simulations for the 21st century, magnitudes of widening of the Hadley circulation increase with radiative forcing. For the extreme projected radiative forcing of RCP8.5, the total annual-mean widening of the Hadley circulation is similar to 0.27A degrees +/- 0.04A degrees (10 yr)(-1) in the 21st century. Although CMIP5 underestimates observed poleward expansion of the Hadley circulation, the results of this study suggest that the observed trends in the width of the Hadley circulation are caused by anthropogenic forcing and that increasing GHGs play an important role in the observed poleward expansion of the Hadley circulation, in addition to other forcings emphasized in previous studies.

引用

页码：790 / 795

页数：6

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