globalchange  > 气候减缓与适应
DOI: 10.1002/2017JC013267
Scopus记录号: 2-s2.0-85042230948
论文题名:
Large Eddy Simulation of Heat Entrainment Under Arctic Sea Ice
作者: Ramudu E.; Gelderloos R.; Yang D.; Meneveau C.; Gnanadesikan A.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:1
起始页码: 287
结束页码: 304
语种: 英语
英文关键词: Arctic mixed layer ; heat entrainment ; ice-ocean interaction ; large eddy simulation ; Near-Surface Temperature Maximum ; Pacific Summer Water
Scopus关键词: climate modeling ; entrainment ; heat flux ; ice-ocean interaction ; large eddy simulation ; mixed layer ; sea ice ; solar radiation ; surface temperature ; temperature anomaly ; temperature profile ; turbulence ; Arctic Ocean ; Canada Basin ; Pacific Ocean
英文摘要: Arctic sea ice has declined rapidly in recent decades. The faster than projected retreat suggests that free-running large-scale climate models may not be accurately representing some key processes. The small-scale turbulent entrainment of heat from the mixed layer could be one such process. To better understand this mechanism, we model the Arctic Ocean's Canada Basin, which is characterized by a perennial anomalously warm Pacific Summer Water (PSW) layer residing at the base of the mixed layer and a summertime Near-Surface Temperature Maximum (NSTM) within the mixed layer trapping heat from solar radiation. We use large eddy simulation (LES) to investigate heat entrainment for different ice-drift velocities and different initial temperature profiles. The value of LES is that the resolved turbulent fluxes are greater than the subgrid-scale fluxes for most of our parameter space. The results show that the presence of the NSTM enhances heat entrainment from the mixed layer. Additionally there is no PSW heat entrained under the parameter space considered. We propose a scaling law for the ocean-to-ice heat flux which depends on the initial temperature anomaly in the NSTM layer and the ice-drift velocity. A case study of “The Great Arctic Cyclone of 2012” gives a turbulent heat flux from the mixed layer that is approximately 70% of the total ocean-to-ice heat flux estimated from the PIOMAS model often used for short-term predictions. Present results highlight the need for large-scale climate models to account for the NSTM layer. © 2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114810
Appears in Collections:气候减缓与适应

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作者单位: Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD, United States; Department of Mechanical Engineering, University of Houston, Houston, TX, United States; Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, United States

Recommended Citation:
Ramudu E.,Gelderloos R.,Yang D.,et al. Large Eddy Simulation of Heat Entrainment Under Arctic Sea Ice[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(1)
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