气候变化领域集成服务门户(CCPortal): Modeling of the Influence of Sea Ice Cycle and Langmuir Circulation on the Upper Ocean Mixed Layer Depth and Freshwater Distribution at the West Antarctic Peninsula

CCPortal

DOI	10.1029/2020JC016109
	Modeling of the Influence of Sea Ice Cycle and Langmuir Circulation on the Upper Ocean Mixed Layer Depth and Freshwater Distribution at the West Antarctic Peninsula
	Schultz C.; Doney S.C.; Zhang W.G.; Regan H.; Holland P.; Meredith M.P.; Stammerjohn S.
发表日期	2020
ISSN	21699275
卷号	125 期号:8
英文摘要	The Southern Ocean is chronically undersampled due to its remoteness, harsh environment, and sea ice cover. Ocean circulation models yield significant insight into key processes and to some extent obviate the dearth of data; however, they often underestimate surface mixed layer depth (MLD), with consequences for surface water-column temperature, salinity, and nutrient concentration. In this study, a coupled circulation and sea ice model was implemented for the region adjacent to the West Antarctic Peninsula, a climatically sensitive region which has exhibited decadal trends towards higher ocean temperature, shorter sea ice season, and increasing glacial freshwater input, overlain by strong interannual variability. Hindcast simulations were conducted with different air-ice drag coefficients and Langmuir circulation parameterizations to determine the impact of these factors on MLD. Including Langmuir circulation deepened the surface mixed layer, with the deepening being more pronounced in the shelf and slope regions. Optimal selection of an air-ice drag coefficient also increased modeled MLD by similar amounts and had a larger impact in improving the reliability of the simulated MLD interannual variability. This study highlights the importance of sea ice volume and redistribution to correctly reproduce the physics of the underlying ocean, and the potential of appropriately parameterizing Langmuir circulation to help correct for biases towards shallow MLD in the Southern Ocean. The model also reproduces observed freshwater patterns in the West Antarctic Peninsula during late summer and suggests that areas of intense summertime sea ice melt can still show net annual freezing due to high sea ice formation during the winter. ©2020. The Authors.
英文关键词	glacial runoff; Langmuir circulation; mixed layer depth; sea ice; West Antarctic Peninsula
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186751
作者单位	Department of Environmental Sciences, University of Virginia, Charlottesville, VA, United States; Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Department of Earth and Atmospheric Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Nansen Environmental and Remote Sensing Center and Bjerknes Centre for Climate Research, Bergen, Norway; British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom; Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States
推荐引用方式 GB/T 7714	Schultz C.,Doney S.C.,Zhang W.G.,et al. Modeling of the Influence of Sea Ice Cycle and Langmuir Circulation on the Upper Ocean Mixed Layer Depth and Freshwater Distribution at the West Antarctic Peninsula[J],2020,125(8).
APA	Schultz C..,Doney S.C..,Zhang W.G..,Regan H..,Holland P..,...&Stammerjohn S..(2020).Modeling of the Influence of Sea Ice Cycle and Langmuir Circulation on the Upper Ocean Mixed Layer Depth and Freshwater Distribution at the West Antarctic Peninsula.Journal of Geophysical Research: Oceans,125(8).
MLA	Schultz C.,et al."Modeling of the Influence of Sea Ice Cycle and Langmuir Circulation on the Upper Ocean Mixed Layer Depth and Freshwater Distribution at the West Antarctic Peninsula".Journal of Geophysical Research: Oceans 125.8(2020).