DOI: 10.1175/JCLI-D-13-00301.1
Scopus记录号: 2-s2.0-84900400112
论文题名: Modeled trends in antarctic sea ice thickness
作者: Holland P.R. ; Bruneau N. ; Enright C. ; Losch M. ; Kurtz N.T. ; Kwok R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 10 起始页码: 3784
结束页码: 3801
语种: 英语
Scopus关键词: Climate models
; Climatology
; Antarctic ice sheets
; Antarctic sea ice
; Concentration change
; Freshwater supply
; Ice concentration
; Pacific sector
; Regional trends
; Satellite observations
; Sea ice
; concentration (composition)
; drift (glacial deposit)
; hindcasting
; ice thickness
; numerical model
; sea ice
; thermodynamics
; trend analysis
; Amundsen Sea
; Antarctic Ice Sheet
; Antarctica
; Southern Ocean
; Weddell Sea
英文摘要: Unlike the rapid sea ice losses reported in the Arctic, satellite observations show an overall increase in Antarctic sea ice concentration over recent decades. However, observations of decadal trends in Antarctic ice thickness, and hence ice volume, do not currently exist. In this study a model of the Southern Ocean and its sea ice, forced by atmospheric reanalyses, is used to assess 1992-2010 trends in ice thickness and volume. The model successfully reproduces observations of mean ice concentration, thickness, and drift, and decadal trends in ice concentration and drift, imparting some confidence in the hindcasted trends in ice thickness. The model suggests that overall Antarctic sea ice volume has increased by approximately 30 km3 yr-1 (0.4% yr-1) as an equal result of areal expansion (20 × 103km2 yr-1 or 0.2%yr-1) and thickening (1.5mmyr21 or 0.2%yr21). This ice volume increase is an order of magnitude smaller than the Arctic decrease, and about half the size of the increased freshwater supply from the Antarctic Ice Sheet. Similarly to the observed ice concentration trends, the small overall increase in modeled ice volume is actually the residual of much larger opposing regional trends. Thickness changes near the ice edge follow observed concentration changes, with increasing concentration corresponding to increased thickness. Ice thickness increases are also found in the inner pack in the Amundsen and Weddell Seas, where the model suggests that observed ice-drift trends directed toward the coast have caused dynamical thickening in autumn and winter. Modeled changes are predominantly dynamic in origin in the Pacific sector and thermodynamic elsewhere. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51045
Appears in Collections: 气候变化事实与影响
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作者单位: British Antarctic Survey, Cambridge, United Kingdom; Tyndall Centre for Climate Change Research, University of East Anglia, Norwich, United Kingdom; Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany; NASA Goddard Space Science Center, Greenbelt, MD, United States; Jet Propulsion Laboratory, Pasadena, CA, United States; RMS Ltd., London, United Kingdom
Recommended Citation:
Holland P.R.,Bruneau N.,Enright C.,et al. Modeled trends in antarctic sea ice thickness[J]. Journal of Climate,2014-01-01,27(10)