Southern Ocean deep convection as a driver of Antarctic warming events.

Pedro, J. B., Martin, Torge , Steig, E. J., Jochum, M., Park, Wonsun and Rasmussen, S. O. (2016) Southern Ocean deep convection as a driver of Antarctic warming events. Open Access Geophysical Research Letters, 43 (5). pp. 2192-2199. DOI 10.1002/2016GL067861.

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Abstract

Simulations with a free-running coupled climate model show that heat release associated with Southern Ocean deep convection variability can drive centennial-scale Antarctic temperature variations of up to 2.0 °C. The mechanism involves three steps: Preconditioning: heat accumulates at depth in the Southern Ocean; Convection onset: wind and/or sea-ice changes tip the buoyantly unstable system into the convective state; Antarctic warming: fast sea-ice–albedo feedbacks (on annual–decadal timescales) and slow Southern Ocean frontal and sea-surface temperature adjustments to convective heat release (on multidecadal–century timescales) drive an increase in atmospheric heat and moisture transport toward Antarctica. We discuss the potential of this mechanism to help drive and amplify climate variability as observed in Antarctic ice-core records.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/610055
Additional Information: WOS:000373109800050
Keywords: Southern Ocean; internal variability; Weddell Sea Polynya; deep convection; sea ice; Antarctic climate
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1002/2016GL067861
ISSN: 0094-8276
Related URLs:
Projects: ice2ice, PalMod in-kind
Expeditions/Models/Experiments:
Date Deposited: 24 Feb 2016 12:53
Last Modified: 17 Jan 2019 13:36
URI: http://oceanrep.geomar.de/id/eprint/31516

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