Connection between the decadal variability in the Southern Ocean circulation and the Southern Annular Mode
Article first published online: 22 AUG 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 16, 28 August 2007
How to Cite
2007), Connection between the decadal variability in the Southern Ocean circulation and the Southern Annular Mode, Geophys. Res. Lett., 34, L16604, doi:10.1029/2007GL030526., , , and (
- Issue published online: 22 AUG 2007
- Article first published online: 22 AUG 2007
- Manuscript Accepted: 19 JUL 2007
- Manuscript Revised: 12 JUN 2007
- Manuscript Received: 27 APR 2007
- decadal variability;
- Southern Ocean circulation;
- Southern Annular Mode
 Previous studies demonstrated the remarkable upward trend of the Southern Annular Mode (SAM) and Southern Ocean wind stress in association with anthropogenic forcing. An oceanic reanalysis data set is used to investigate the response of the circulation in the Southern Ocean to the decadal variability of SAM. Our results indicate the strengthening and the poleward shift of the northward Ekman velocity as well as the Ekman pumping rate, which led to a corresponding strengthening trend in the Deacon Cell. This strengthening, in turn, intensified the meridional density gradient and the tilting of the isopycnal surfaces. On the interannual time scale, the Antarctic Circumpolar Currents (ACC) transport exhibits a positive correlation with SAM index as seen separately in observations. However, there is no significant trend in the total transport of ACC. Possible reasons are discussed.