DOI: 10.1002/grl.50640
论文题名: The role of the geothermal heat flux in driving the abyssal ocean circulation
作者: Mashayek A. ; Ferrari R. ; Vettoretti G. ; Peltier W.R.
刊名: Geophysical Research Letters
ISSN: 0094-8894
EISSN: 1944-8625
出版年: 2013
卷: 40, 期: 12 起始页码: 3144
结束页码: 3149
语种: 英语
英文关键词: abyssal circulation
; abyssal mixing
; geothermal heat flux
; ocean mixing
Scopus关键词: Abyssal circulation
; Abyssal mixing
; Antarctic Bottom Water
; Depth dependence
; Diapycnal diffusivity
; Ocean circulation
; Ocean mixing
; Vertical variation
; Geothermal heating
; Mixing
; Oceanography
; Heat flux
; abyssal circulation
; bottom water
; data set
; eddy
; geothermal energy
; heat flux
; mixing
; solid Earth
; stratification
; Southern Ocean
英文摘要: The results presented in this paper demonstrate that the geothermal heat flux (GHF) from the solid Earth into the ocean plays a non-negligible role in determining both abyssal stratification and circulation strength. Based upon an ocean data set, we show that the map of upward heat flux at the ocean floor is consistent (within a factor of 2) with the ocean floor age-dependent map of GHF. The observed buoyancy flux above the ocean floor is consistent with previous suggestions that the GHF acts to erode the abyssal stratification and thereby enhances the strength of the abyssal circulation. Idealized numerical simulations are performed using a zonally averaged single-basin model which enables us to address the GHF impact as a function of the depth dependence of diapycnal diffusivity. We show that ignoring this vertical variation leads to an under-prediction of the influence of the GHF on the abyssal circulation. Independent of the diffusivity profile, introduction of the GHF in the model leads to steepening of the Southern Ocean isopycnals and to strengthening of the eddy-induced circulation and the Antarctic bottom water cell. The enhanced circulation ventilates the GHF derived heating to shallow depths, primarily in the Southern Ocean. Key Points Geothermal heat flux plays a key role in setting the abyssal circulation Interplay of abyssal mixing and geothermal heat flux needs further investigation Role of Geothermal flux has implication for certain paleooceanographic events ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880566867&doi=10.1002%2fgrl.50640&partnerID=40&md5=c4fa49d7ed7f9acf9a109a99df8a42d4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6158
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
Recommended Citation:
Mashayek A.,Ferrari R.,Vettoretti G.,et al. The role of the geothermal heat flux in driving the abyssal ocean circulation[J]. Geophysical Research Letters,2013-01-01,40(12).