Physical controls of Southern Ocean deep-convection variability in CMIP5 models and the Kiel Climate Model.

Reintges, Annika , Martin, Torge , Latif, Mojib and Park, Wonsun (2017) Physical controls of Southern Ocean deep-convection variability in CMIP5 models and the Kiel Climate Model. Open Access Geophysical Research Letters, 44 (13). pp. 6951-6958. DOI 10.1002/2017GL074087.

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Abstract

Global climate models exhibit large biases in the Southern Ocean. For example, in models Antarctic bottom water is formed mostly through open-ocean deep-convection rather than through shelf convection. Still, the timescale, region, and intensity of deep-convection variability vary widely among models. We investigate the physical controls of this variability in the Atlantic sector of the Southern Ocean, where most of the models simulate recurring deep-convection events. We analyzed output from eleven exemplary CMIP5 models and four versions of the Kiel Climate Model (KCM). Of several potential physical control parameters that we tested, the ones shared by all these models are: Stratification in the convection region influences the timescale of the deep-convection variability, i.e. models with a strong (weak) stratification vary on long (short) timescales. And, sea ice volume affects the modeled mean state in the Southern Ocean: large (small) sea ice volume is associated with a non-convective (convective) predominant regime.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/308299
Keywords: Southern Ocean; Sea ice; Deep-convection; Internal variability; CMIP5; Antarctic Bottom Water
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
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
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2017GL074087
ISSN: 0094-8276
Projects: NACLIM, InterDec, PalMod in-kind, Future Ocean, KCM
Expeditions/Models/Experiments:
Date Deposited: 27 Jun 2017 12:43
Last Modified: 01 Feb 2019 15:02
URI: http://oceanrep.geomar.de/id/eprint/38608

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