Observed poleward expansion of the Hadley circulation since 1979

被引:399
作者
Hu, Y. [1 ]
Fu, Q.
机构
[1] Peking Univ, Dept Atmospher Sci, Beijing, Peoples R China
[2] Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA
关键词
D O I
10.5194/acp-7-5229-2007
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Using three meteorological reanalyses and three outgoing long-wave radiation (OLR) datasets, we show that the Hadley circulation has a significant expansion of about 2 to 4.5 degrees of latitude since 1979. The three reanalyses all indicate that the poleward expansion of the Hadley circulation in each hemisphere occurs during its summer and fall seasons. Results from the OLR datasets do not have such seasonality. The expansion of the Hadley circulation implies a poleward expansion of the band of subtropical subsidence, leading to enhanced mid-latitude tropospheric warming and poleward shifts of the subtropical dry zone. This would contribute to an increased frequency of midlatitude droughts in both hemispheres.
引用
收藏
页码:5229 / 5236
页数:8
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