2238 JOURNAL OF CLIMATE VOLUME 14 Southern Hemisphere Atmospheric Circulation Response to Global Warming

The response of the Southern Hemisphere (SH), extratropical, atmospheric general circulation to transient, anthropogenic, greenhouse warming is investigated in a coupled climate model. The extratropical circulation response consists of a SH summer half-year poleward shift of the westerly jet and a y...

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Bibliographic Details
Main Authors: Paul J. Kushner, Isaac M. Held, Thomas, L. Delworth
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 2000
Subjects:
Antarctic
The Antarctic
Antarc*
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.141.820
http://www.gfdl.noaa.gov/reference/bibliography/2001/pjk0101.pdf
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Summary:The response of the Southern Hemisphere (SH), extratropical, atmospheric general circulation to transient, anthropogenic, greenhouse warming is investigated in a coupled climate model. The extratropical circulation response consists of a SH summer half-year poleward shift of the westerly jet and a year-round positive wind anomaly in the stratosphere and the tropical upper troposphere. Along with the poleward shift of the jet, there is a poleward shift of several related fields, including the belt of eddy momentum-flux convergence and the mean meridional overturning in the atmosphere and in the ocean. The tropospheric wind response projects strongly onto the model’s ‘‘Southern Annular Mode’ ’ (also known as the ‘‘Antarctic oscillation’’), which is the leading pattern of variability of the extratropical zonal winds. 1.

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