DOI: 10.5194/tc-8-761-2014
Scopus记录号: 2-s2.0-84899628856
论文题名: Sea ice and the ocean mixed layer over the Antarctic shelf seas
作者: Petty A ; A ; , Holland P ; R ; , Feltham D ; L
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 2 起始页码: 761
结束页码: 783
语种: 英语
英文关键词: air-sea interaction
; heat flux
; ice shelf
; mixed layer
; regression analysis
; sea ice
; wind stress
; Southern Ocean
英文摘要: An ocean mixed-layer model has been incorporated into the Los Alamos sea ice model CICE to investigate regional variations in the surface-driven formation of Antarctic shelf waters. This model captures well the expected sea ice thickness distribution, and produces deep (> 500 m) mixed layers in the Weddell and Ross shelf seas each winter. This results in the complete destratification of the water column in deep southern coastal regions leading to high-salinity shelf water (HSSW) formation, and also in some shallower regions (no HSSW formation) of these seas. Shallower mixed layers are produced in the Amundsen and Bellingshausen seas. By deconstructing the surface processes driving the mixed-layer depth evolution, we show that the net salt flux from sea ice growth/melt dominates the evolution of the mixed layer in all regions, with a smaller contribution from the surface heat flux and a negligible input from wind stress. The Weddell and Ross shelf seas receive an annual surplus of mixing energy at the surface; the Amundsen shelf sea energy input in autumn/winter is balanced by energy extraction in spring/summer; and the Bellingshausen shelf sea experiences an annual surface energy deficit, through both a low energy input in autumn/winter and the highest energy loss in spring/summer. An analysis of the sea ice mass balance demonstrates the contrasting mean ice growth, melt and export in each region. The Weddell and Ross shelf seas have the highest annual ice growth, with a large fraction exported northwards each year, whereas the Bellingshausen shelf sea experiences the highest annual ice melt, driven by the advection of ice from the northeast. A linear regression analysis is performed to determine the link between the autumn/winter mixed-layer deepening and several atmospheric variables. The Weddell and Ross shelf seas show stronger spatial correlations (temporal mean - intra-regional variability) between the autumn/winter mixed-layer deepening and several atmospheric variables compared to the Amundsen and Bellingshausen. In contrast, the Amundsen and Bellingshausen shelf seas show stronger temporal correlations (shelf sea mean - interannual variability) between the autumn/winter mixed-layer deepening and several atmospheric variables. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74856
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Centre for Polar Observation and Modelling, Department of Earth Sciences, University College London, London, WC1E 6BT, United Kingdom; British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, United Kingdom; Centre for Polar Observation and Modelling, Department of Meteorology, University of Reading, Reading, RG6 6BB, United Kingdom; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States
Recommended Citation:
Petty A,A,, Holland P,et al. Sea ice and the ocean mixed layer over the Antarctic shelf seas[J]. Cryosphere,2014-01-01,8(2)