DECADAL CHANGES IN THE HADLEY CIRCULATION
DECADAL CHANGES IN THE HADLEY CIRCULATION
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DOI：
10.1142/9789812838100_0006
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发表时间：
2010-05
期刊：
影响因子：
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通讯作者：
Yongyun Hu;Chen Zhou
中科院分区：
文献类型：
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作者：
Yongyun Hu;Chen Zhou
哈德利环流是最重要的大气环流之一。本文的主要目的是研究作为全球气候变化组成部分的哈德利环流在过去几十年中是否发生了变化。我们关注两个关键点：一个是哈德利环流的水平尺度，另一个是它的强度。利用三次气象再分析，我们发现自1979年以来，Hadley环流在秋季两半球都有大约2到4.5度的显著扩张，其中两次再分析资料显示北半球冬季Hadley环流增强。从大气环流模式模拟得出的趋势与观测到的哈德利环流变化进行了比较。结果发现，大多数模拟都显示Hadley环流向极地扩展，但幅度较小。然而，大多数模拟显示哈德利环流减弱，而不是加强
The Hadley circulation is one of the most important atmospheric circulations. The main goal of this paper is to investigate whether the Hadley circulation has changed in the past few decades as an integral part of global climate change. We focus on two key points: one is the horizontal scale of the Hadley circulation, and the other one is its strength. Using three meteorological reanalyses, we show that the Hadley circulation has a significant expansion of about 2 to 4.5 degrees of latitude in autumn for both hemispheres since 1979, and that two of the three reanalysis datasets show strengthening of the Hadley circulation in Northern-Hemisphere winter. Trends derived from general circulation model simulations are compared with observed changes in the Hadley circulation. It is found that most simulations show poleward expansion of the Hadley circulation, with weaker magnitudes. However, most simulations display weakening of the Hadley circulation, rather than strengthening