Expansion of the Hadley cell under global warming
Expansion of the Hadley cell under global warming
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DOI：
10.1029/2006gl028443
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发表时间：
2007-03-24
影响因子：
5.2
通讯作者：
Reichler, Thomas
中科院分区：
文献类型：
--
作者：
Lu, Jian;Vecchi, Gabriel A.;Reichler, Thomas
在IPCC AR4项目的气候变化模拟中，诊断出Hadley环流的持续减弱和向极扩展。与这种扩大相关联的是亚热带干燥带向极地的扩张。简单的标度分析支持的概念，即哈德利细胞的极向范围设置的位置，热驱动射流首先成为斜压不稳定。副热带静稳定度的增强使斜压不稳定带向极方向移动，从而使Hadley环流的外边界向极方向移动，从而导致Hadley环流的扩张。
A consistent weakening and poleward expansion of the Hadley circulation is diagnosed in the climate change simulations of the IPCC AR4 project. Associated with this widening is a poleward expansion of the subtropical dry zone. Simple scaling analysis supports the notion that the poleward extent of the Hadley cell is set by the location where the thermally driven jet first becomes baroclinically unstable. The expansion of the Hadley cell is caused by an increase in the subtropical static stability, which pushes poleward the baroclinic instability zone and hence the outer boundary of the Hadley cell.