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Expansion of the Hadley cell under global warming

descriptionPublicationkeyboard_double_arrow_right Article , Journal 01 Mar 2007 United States Publisher:American Geophysical Union (AGU)Journal:Geophysical Research Letters, volume 34 (issn: 0094-8276, eissn: 1944-8007,

Authors: Reichler, Thomas J.; Lu, Jian.; Vecchi, Gabriel A.;

doi: 10.1029/2006gl028443

Expansion of the Hadley cell under global warming

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Abstract

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.

Country

United States

Related Organizations

University Corporation for Atmospheric Research
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University of Utah
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National Oceanic and Atmospheric Administration
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University of Utah
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National Oceanic and Atmospheric Administration
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Keywords

Hadley cell, Baroclinicity, Climate change, Climatic changes, Subtropical dry zone, Desertification

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