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The Influence of the Stratosphere on the Tropospheric Zonal Wind Response to Co2 Doubling : Volume 10, Issue 10 (12/10/2010)

By Hinssen, Y. B. L.

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Book Id: WPLBN0003981296
Format Type: PDF Article :
File Size: Pages 31
Reproduction Date: 2015

Title: The Influence of the Stratosphere on the Tropospheric Zonal Wind Response to Co2 Doubling : Volume 10, Issue 10 (12/10/2010)  
Author: Hinssen, Y. B. L.
Volume: Vol. 10, Issue 10
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Bell, C. J., Siegmund, P. C., & L. Hinsse, Y. B. (2010). The Influence of the Stratosphere on the Tropospheric Zonal Wind Response to Co2 Doubling : Volume 10, Issue 10 (12/10/2010). Retrieved from

Description: Institute for Marine and Atmospheric research Utrecht, Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands. The influence of a CO2 doubling on the stratospheric potential vorticity (PV) is examined in two climate models. Subsequently, the influence of changes in the stratosphere on the tropospheric zonal wind response is investigated, by inverting the stratospheric PV.

Radiative effects dominate the stratospheric response to CO2 doubling in the Southern Hemisphere. These lead to a stratospheric PV increase at the edge of the polar vortex, resulting in an increased westerly influence of the stratosphere on the tropospheric midlatitude winds in late winter.

In the Northern Hemisphere, dynamical effects are also important. Both models show a reduced polar PV and an enhanced midlatitude PV in the Northern Hemisphere winter stratosphere. These PV changes are related to an enhanced wave forcing of the winter stratosphere, as measured by an increase in the 100 hPa eddy heat flux, and result in a reduced westerly influence of the stratosphere on the high latitude tropospheric winds. In one model, the high latitude PV decreases are, however, restricted to higher altitudes, and the tropospheric response due to the stratospheric changes is dominated by an increased westerly influence in the midlatitudes, related to the increase in midlatitude PV in the lower stratosphere.

The tropospheric response in zonal wind due to the stratospheric PV changes is of the order of 0.5 to 1 m s−1. The total tropospheric response has a somewhat different spatial structure, but is of similar magnitude. This indicates that the stratospheric influence is of importance in modifying the tropospheric zonal wind response to CO2 doubling.

The influence of the stratosphere on the tropospheric zonal wind response to CO2 doubling

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