Journal
POLAR SCIENCE
Volume 4, Issue 2, Pages 149-186Publisher
ELSEVIER
DOI: 10.1016/j.polar.2010.05.001
Keywords
Antarctic sea ice; Climate change; Ecological impacts; Icebergs; Ice sheet; Ocean
Categories
Funding
- Australian Government's Cooperative Research Centre program through the ACE CRC
- Ocean Sciences Department, University of California Santa Cruz
- Palmer LTER [NSF/OPP 0823101]
- Office of Polar Programs (OPP)
- Directorate For Geosciences [823101] Funding Source: National Science Foundation
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Although Antarctic sea ice is undergoing a slight increase in overall extent, major regional changes are occurring in its spatio-temporal characteristics (most notably in sea ice seasonality). Biologically significant aspects of Antarctic sea ice are evaluated, emphasising the importance of scale and thermodynamics versus dynamics. Changing sea ice coverage is having major direct and indirect though regionally-dependent effects on ecosystem structure and function, with the most dramatic known effects to date occurring in the West Antarctic Peninsula region. There is mounting evidence that loss of sea ice has affected multiple levels of the marine food web in a complex fashion and has triggered cascading effects. Impacts on primary production, Antarctic krill, fish, marine mammals and birds are assessed, and are both negative and positive. The review includes recent analysis of change/variability in polynyas and fast ice, and also highlights the significance of extreme events (which have paradoxical impacts). Possible future scenarios are investigated in the light of the predicted decline in sea ice by 2100 e.g. increased storminess/waviness, numbers of icebergs and snowfall. Our current lack of knowledge on many aspects of sea ice-related change and biological response is emphasised. (C) 2010 Elsevier B.V. and NIPR. All rights reserved.
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