气候变化领域集成服务门户(CCPortal): The KPP Trigger of Rapid AMOC Intensification in the Nonlinear Dansgaard-Oeschger Relaxation Oscillation

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DOI	10.1029/2019JC015557
	The KPP Trigger of Rapid AMOC Intensification in the Nonlinear Dansgaard-Oeschger Relaxation Oscillation
	Peltier W.R.; Ma Y.; Chandan D.
发表日期	2020
ISSN	21699275
卷号	125 期号:5
英文摘要	Millennium time scale Dansgaard-Oeschger oscillations of glacial climate, clear evidence for the occurrence of which was first provided on the basis of oxygen isotopic data from a Greenland ice core 25 years ago, have recently been shown to arise naturally (without explicit freshwater forcing) in a fully coupled modern climate model description of the interactions between the overturning circulation of the oceans, the atmosphere, and sea ice under maximum glacial conditions. The fast transitions from cold stadial to warm interstadial conditions in a typical D-O oscillation are characterized by the appearance of an extensive polynya in the stadial sea ice cover of the Irminger Sea south of Denmark Strait that opens due to the onset of intense vertical mixing below the sea ice lid. Through detailed stability analysis of the water column in the region where the polynya first forms, together with analysis of the action of the KPP (Kappa Profile Parameterization) of stratified turbulence employed to represent water column diapycnal diffusivity, the authors show that the opening of the polynya is controlled by this turbulence parameterization. The relative contributions of the different components of the parameterization to polynya opening are investigated in order to better understand the rapid climate change that ensues. The authors furthermore show that the characteristic period of the model predicted Dansgaard-Oeschger oscillation is also controlled by the detailed nature of this parameterization, a characteristic of the oscillation not previously explained. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Atlantic Meridional overtruning circulation; Dansgaard-Oesxhger oscillations; diapycnal diffusivity; rapid climate change and the oceans
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/186890
作者单位	Department of Physics, University of Toronto, Toronto, ON, Canada
推荐引用方式 GB/T 7714	Peltier W.R.,Ma Y.,Chandan D.. The KPP Trigger of Rapid AMOC Intensification in the Nonlinear Dansgaard-Oeschger Relaxation Oscillation[J],2020,125(5).
APA	Peltier W.R.,Ma Y.,&Chandan D..(2020).The KPP Trigger of Rapid AMOC Intensification in the Nonlinear Dansgaard-Oeschger Relaxation Oscillation.Journal of Geophysical Research: Oceans,125(5).
MLA	Peltier W.R.,et al."The KPP Trigger of Rapid AMOC Intensification in the Nonlinear Dansgaard-Oeschger Relaxation Oscillation".Journal of Geophysical Research: Oceans 125.5(2020).