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Interactions between Antarctic sea ice and large-scale atmospheric modes in CMIP5 models

Citation

Schroeter, S and Hobbs, W and Bindoff, NL, Interactions between Antarctic sea ice and large-scale atmospheric modes in CMIP5 models, Cryosphere, 11 pp. 789-803. ISSN 1994-0416 (2017) [Refereed Article]


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Copyright Statement

© Author(s) 2017 Licenced under Creative Commons Attribution United States (CC BY 3.0 US) https://creativecommons.org/licenses/by/3.0/us/

DOI: doi:10.5194/tc-11-789-2017

Abstract

The response of Antarctic sea ice to large-scale patterns of atmospheric variability varies according to sea ice sector and season. In this study, interannual atmosphere–sea ice interactions were explored using observations and reanalysis data, and compared with simulated interactions by models in the Coupled Model Intercomparison Project Phase 5 (CMIP5). Simulated relationships between atmospheric variability and sea ice variability generally reproduced the observed relationships, though more closely during the season of sea ice advance than the season of sea ice retreat. Atmospheric influence on sea ice is known to be strongest during advance, and it appears that models are able to capture the dominance of the atmosphere during advance. Simulations of ocean–atmosphere–sea ice interactions during retreat, however, require further investigation.

A large proportion of model ensemble members overestimated the relative importance of the Southern Annular Mode (SAM) compared with other modes of high southern latitude climate, while the influence of tropical forcing was underestimated. This result emerged particularly strongly during the season of sea ice retreat. The zonal patterns of the SAM in many models and its exaggerated influence on sea ice overwhelm the comparatively underestimated meridional influence, suggesting that simulated sea ice variability would become more zonally symmetric as a result. Across the seasons of sea ice advance and retreat, three of the five sectors did not reveal a strong relationship with a pattern of large-scale atmospheric variability in one or both seasons, indicating that sea ice in these sectors may be influenced more strongly by atmospheric variability unexplained by the major atmospheric modes, or by heat exchange in the ocean.

Item Details

Item Type:Refereed Article
Keywords:sea ice, climate models, climate variability
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Atmospheric Dynamics
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts)
Author:Schroeter, S (Ms Serena Schroeter)
Author:Hobbs, W (Dr Will Hobbs)
Author:Bindoff, NL (Professor Nathan Bindoff)
ID Code:115456
Year Published:2017
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2017-03-27
Last Modified:2017-04-07
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