DOI: 10.1002/2015GL063561
论文题名: Glacial ocean overturning intensified by tidal mixing in a global circulation model
作者: Schmittner A. ; Green J.A.M. ; Wilmes S.-B.
刊名: Geophysical Research Letters
ISSN: 0094-9620
EISSN: 1944-9351
出版年: 2015
卷: 42, 期: 10 起始页码: 4014
结束页码: 4022
语种: 英语
英文关键词: Last Glacial Maximum
; ocean circulation
; tidal mixing
Scopus关键词: Climate models
; Energy dissipation
; Glacial geology
; Mixing
; Oceanography
; Sea level
; Deep-ocean circulation
; Global circulation model
; Last Glacial Maximum
; Meridional overturning circulations
; Ocean circulation
; Surface boundary conditions
; Tidal mixing
; Vertical diffusivity
; Tidal power
; circulation modeling
; climate modeling
; deep sea
; energy dissipation
; energy flux
; Last Glacial Maximum
; mixing
; oceanic circulation
; overturn
; paleoclimate
; sea level
; shallow water
; tidal cycle
英文摘要: Due to lower sea levels during the Last Glacial Maximum (LGM), tidal energy dissipation was shifted from the shallow margins into the deep ocean. Here using a high-resolution tide model, we estimate that global energy fluxes below 200 m depth were almost quadrupled during the LGM. Applying the energy fluxes to a consistent tidal mixing parameterization of a global climate model results in a large intensification of mixing. Global mean vertical diffusivity increases by more than a factor of 3, and consequently, the simulated meridional overturning circulation accelerates by ∼21-46%. In the model, these effects are at least as important as those from changes in surface boundary conditions. Our findings contrast with the prevailing view that the abyssal LGM circulation was more sluggish. We conclude that changes in tidal mixing are an important mechanism that may have strongly increased the glacial deep ocean circulation and should no longer be neglected in paleoclimate simulations. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84931561104&doi=10.1002%2f2015GL063561&partnerID=40&md5=f43db12f6f12c0148236ccb9efd3015b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9235
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States
Recommended Citation:
Schmittner A.,Green J.A.M.,Wilmes S.-B.. Glacial ocean overturning intensified by tidal mixing in a global circulation model[J]. Geophysical Research Letters,2015-01-01,42(10).