Detection of external influence on sea level pressure with a multi-model ensemble
Article first published online: 13 OCT 2005
Copyright 2005 by the American Geophysical Union.
Geophysical Research Letters
Volume 32, Issue 19, October 2005
How to Cite
2005), Detection of external influence on sea level pressure with a multi-model ensemble, Geophys. Res. Lett., 32, L19714, doi:10.1029/2005GL023640., , and (
- Issue published online: 13 OCT 2005
- Article first published online: 13 OCT 2005
- Manuscript Accepted: 31 AUG 2005
- Manuscript Revised: 28 JUL 2005
- Manuscript Received: 13 JUN 2005
 Over the past fifty years, December–February mean sea level pressure has decreased markedly over both poles, corresponding to a trend toward strengthened westerlies in both hemispheres. In this study we compare observed sea level pressure trends with those simulated in response to natural and anthropogenic influence in a suite of eight up-to-date coupled general circulation models. A global analysis indicates that sea level pressure trends may be attributed to external influence. However, while simulated Southern Hemisphere sea level pressure trends are consistent with those observed, simulated Northern Hemisphere sea level pressure trends are not: Observations show a large negative trend in the Arctic and a positive trend over the subtropical North Atlantic and Mediterranean which is not reproduced in the simulations.