The impact of decadal-scale Indian Ocean sea surface temperature anomalies on Sahelian rainfall and the North Atlantic Oscillation
Article first published online: 26 NOV 2003
Copyright 2003 by the American Geophysical Union.
Geophysical Research Letters
Volume 30, Issue 22, November 2003
How to Cite
2003), The impact of decadal-scale Indian Ocean sea surface temperature anomalies on Sahelian rainfall and the North Atlantic Oscillation, Geophys. Res. Lett., 30, 2169, doi:10.1029/2003GL018426, 22., and (
- Issue published online: 26 NOV 2003
- Article first published online: 26 NOV 2003
- Manuscript Accepted: 28 OCT 2003
- Manuscript Revised: 12 OCT 2003
- Manuscript Received: 15 AUG 2003
 The sea surface temperatures (SSTs) of the tropical Indian Ocean show a pronounced warming since the 1950s. We have analyzed the impact of this warming on Sahelian rainfall and on the North Atlantic Oscillation (NAO) by conducting ensemble experiments with an atmospheric general circulation model. Additionally, we investigate the impact of the other two tropical oceans on these two climate parameters. Our results suggest that the warming trend in the Indian Ocean played a crucial role for the drying trend over the West Sahel from the 1950s to 1990s and may also have contributed to the strengthening of the NAO during the most recent decades.