Tropical influence independent of ENSO on the austral summer Southern Annular Mode

Ding, Hui, Greatbatch, Richard John and Gollan, Gereon (2014) Tropical influence independent of ENSO on the austral summer Southern Annular Mode Geophysical Research Letters, 41 (10). pp. 3643-3648. DOI 10.1002/2014GL059987.

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A link between atmospheric variability in the Tropics independent of ENSO and the Southern Annular Mode (SAM) is found based on seasonal mean data for austral summer. Variations associated with El Niño Southern Oscillation (ENSO) are removed usinga linear method and a Tropics Index (TI) is defined as the zonal average of the ENSO-removed 500 hPa geopotential height between 10°S and 10°N. Since the detrended TI shows no link to SST variability in the Tropics, it appears to be related to internal atmospheric variability. We find that the TI can explain about 40% variance of the SAM interannual variability and about 75% of the SAM long term trend between 1957/58 and 2001/02, where here the SAM includes the ENSO signal. Positive/negative values of the TI are associated with the positive/negative SAM. A possible link between the TI and global warming is noted.

Document Type: Article
Additional Information: WOS:000337610200044
Keywords: Southern Annular Mode; ISOLAA, SPP 1158 Antarktisforschung
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
Refereed: Yes
DOI etc.: 10.1002/2014GL059987
ISSN: 0094-8276
Projects: MODINI, ISOLAA, MiKlip, ISOLAA, SPP 1158 Antarktisforschung
Date Deposited: 16 May 2014 08:02
Last Modified: 10 Apr 2017 08:38

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