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Potential regime shift in decreased sea ice production after the Mertz Glacier calving

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Title: Potential regime shift in decreased sea ice production after the Mertz Glacier calving
Authors: Tamura, T. Browse this author
Williams, G. D. Browse this author
Fraser, A. D. Browse this author
Ohshima, K. I. Browse this author →KAKEN DB
Issue Date: 8-May-2012
Publisher: Nature Publishing Group
Journal Title: Nature Communications
Volume: 3
Start Page: 826
Publisher DOI: 10.1038/ncomms1820
Abstract: Variability in dense shelf water formation can potentially impact Antarctic Bottom Water (AABW) production, a vital component of the global climate system. In East Antarctica, the George V Land polynya system (142-150°E) is structured by the local 'icescape', promoting sea ice formation that is driven by the offshore wind regime. Here we present the first observations of this region after the repositioning of a large iceberg (B9B) precipitated the calving of the Mertz Glacier Tongue in 2010. Using satellite data, we find that the total sea ice production for the region in 2010 and 2011 was 144 and 134 km3, respectively, representing a 14-20% decrease from a value of 168 km3 averaged from 2000-2009. This abrupt change to the regional icescape could result in decreased polynya activity, sea ice production, and ultimately the dense shelf water export and AABW production from this region for the coming decades.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大島 慶一郎

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