Close interactions between the Antarctic cyclone budget and large-scale atmospheric circulation
Article first published online: 21 JUN 2013
©2013. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 40, Issue 12, pages 3237–3241, 28 June 2013
How to Cite
2013), Close interactions between the Antarctic cyclone budget and large-scale atmospheric circulation, Geophys. Res. Lett., 40, 3237–3241, doi:10.1002/grl.50560., , and (
- Issue published online: 18 JUL 2013
- Article first published online: 21 JUN 2013
- Accepted manuscript online: 16 MAY 2013 08:02AM EST
- Manuscript Accepted: 13 MAY 2013
- Manuscript Received: 23 APR 2013
- AMICO. Grant Numbers: 128533, 263918
 For the first time, we quantify relationships between the Southern Ocean cyclones and large-scale atmospheric variability indices: the Southern Annular Mode (SAM), the El Niño–Southern Oscillation (ENSO), the Zonal Wave 3 (ZW3) pattern, and the semiannual oscillation (SAO). Using the ERA-Interim 1979–2011 results, we identify cyclones south of 40°S and calculate monthly sectoral cyclone budgets of the Southern Ocean, defined as cyclogenesis minus cyclolysis plus net movement of cyclones into each sector. The SAM index has a strong connection with cyclones across all sectors. Positive SAM values are related to decreased eastward and increased southward movement of cyclones, resulting in higher cyclone densities along the Antarctic coast. The ENSO index shows strong associations with the cyclone behavior in the Amundsen-Ross Seas, whereas other regions are less sensitive to it. The ZW3 index has a stronger association with the meridional movement of cyclones than other indices.