Expansion of the Hadley cell under global warming
Article first published online: 24 MAR 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 6, March 2007
How to Cite
2007), Expansion of the Hadley cell under global warming, Geophys. Res. Lett., 34, L06805, doi:10.1029/2006GL028443., , and (
- Issue published online: 24 MAR 2007
- Article first published online: 24 MAR 2007
- Manuscript Accepted: 21 FEB 2007
- Manuscript Revised: 9 FEB 2007
- Manuscript Received: 11 OCT 2006
- Hadley cell;
- subtropical dry zone;
- static stability
 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.