Expansion of the Hadley cell under global warming

Geophysical Research Letters - Tập 34 Số 6 - 2007
Jian Lu1,2, Gabriel A. Vecchi3, Thomas Reichler4
1Climate and Global Dynamics Division, National Center for Atmospheric Research University Corporation for Atmospheric Research Boulder Colorado USA
2University Corporation for Atmospheric Research Visiting Scientist Program, Geophysical Fluid Dynamics Laboratory, NOAA Princeton University Princeton New Jersey USA
3Geophysical Fluid Dynamics Laboratory, National Oceanic and Atmospheric Administration Princeton University Princeton New Jersey USA
4Department of Meteorology, University of Utah Salt Lake City, Utah, USA

Tóm tắt

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.

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Geophysical Research Letters

Tập 34 Số 6

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