DOI: 10.1002/2018JC013764
Scopus记录号: 2-s2.0-85046442995
论文题名: Episodic reversal of autumn ice advance caused by release of ocean heat in the beaufort sea
作者: Smith M. ; Stammerjohn S. ; Persson O. ; Rainville L. ; Liu G. ; Perrie W. ; Robertson R. ; Jackson J. ; Thomson J.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 5 起始页码: 3164
结束页码: 3185
语种: 英语
Scopus关键词: air-sea interaction
; autumn
; heat flux
; ice cover
; ice-ocean interaction
; mixed layer
; sea ice
; storm
; upper ocean
; Arctic Ocean
; Beaufort Sea
英文摘要: High-resolution measurements of the air-ice-ocean system during an October 2015 event in the Beaufort Sea demonstrate how stored ocean heat can be released to temporarily reverse seasonal ice advance. Strong on-ice winds over a vast fetch caused mixing and release of heat from the upper ocean. This heat was sufficient to melt large areas of thin, newly formed pancake ice; an average of 10 MJ/m2was lost from the upper ocean in the study area, resulting in ~3–5 cm pancake sea ice melt. Heat and salt budgets create a consistent picture of the evolving air-ice-ocean system during this event, in both a fixed and icefollowing (Lagrangian) reference frame. The heat lost from the upper ocean is large compared with prior observations of ocean heat flux under thick, multiyear Arctic sea ice. In contrast to prior studies, where almost all heat lost goes into ice melt, a significant portion of the ocean heat released in this event goes directly to the atmosphere, while the remainder (~30–40%) goes into melting sea ice. The magnitude of ocean mixing during this event may have been enhanced by large surface waves, reaching nearly 5 m at the peak, which are becoming increasingly common in the autumn Arctic Ocean. The wave effects are explored by comparing the air-ice-ocean evolution observed at short and long fetches, and a common scaling for Langmuir turbulence. After the event, the ocean mixed layer was deeper and cooler, and autumn ice formation resumed. Plain Language Summary As Arctic Ocean temperatures drop below freezing in the autumn, sea ice begins to form, sealing off the ocean below. The ice’s southward advance throughout autumn is not linear, however, as stormevents may act to pause its progression. We observed a 4 day storm event in the western Arctic Ocean in October 2015 with strong winds (up to 20m/s) and large waves (over 4 m). As a result, heat from the upper ocean wasmixed to the surface, melting approximately 5 cm thick ice over a vast area. This event temporarily reversed autumn ice advance and resulted in a thinner winter ice cover. This study is the first to document autumn melt of sea ice by ocean heat in the thin, new ice that increasingly dominates in the Arctic Ocean. The magnitude of the heat lost is likely related to the large surface waves during this event that result from lower sea ice cover. These results highlight the importance of air-sea interactions in current and future Arctic sea ice cover. © 2018. American Geophysical Union. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113934
Appears in Collections: 气候减缓与适应
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作者单位: Applied Physics Laboratory, University of Washington, Seattle, WA, United States; Institute of Arctic & Alpine Research, University of Colorado, Boulder, CO, United States; NOAA/ESRL Physical Sciences Division, Boulder, CO, United States; Bedford Institute of Oceanography, Fisheries & Oceans Canada, Dartmouth, NS, Canada; China-ASEAN College of Marine Sciences, Xiamen University, Sepang, Selangor, Malaysia; Hakai Science, Hakai Institute, Calvert Island, BC, Canada
Recommended Citation:
Smith M.,Stammerjohn S.,Persson O.,et al. Episodic reversal of autumn ice advance caused by release of ocean heat in the beaufort sea[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(5)