气候变化领域集成服务门户(CCPortal): Decomposing Barotropic Transport Variability in a High-Resolution Model of the North Atlantic Ocean

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DOI	10.1029/2019JC015516
	Decomposing Barotropic Transport Variability in a High-Resolution Model of the North Atlantic Ocean
	Wang Y.; Greatbatch R.J.; Claus M.; Sheng J.
发表日期	2020
ISSN	21699275
卷号	125 期号:5
英文摘要	A method using a linear shallow water model is presented for decomposing the temporal variability of the barotropic stream function in a high-resolution ocean model. The method is based on the vertically averaged momentum equations and is applied to the time series of annual mean stream function from the model configuration VIKING20 for the northern North Atlantic. An important result is the role played by the nonlinear advection terms in VIKING20 for driving transport. The method is illustrated by examining how the Gulf Stream transport in the recirculation region responds to the winter North Atlantic Oscillation (NAO). While no statistically significant response is found in the year overlapping with the winter NAO index, there is a tendency for the Gulf Stream transport to increase as the NAO becomes more positive. This becomes significant in lead years 1 and 2 when the mean flow advection and eddy momentum flux contributions, associated with nonlinear momentum advection, dominate. Only after 2 years, does the potential energy term, associated with the density field, start to play a role and it is only after 5 years that the transport dependence on the NAO ceases to be significant. It is also shown that the potential energy contribution to the transport stream function has significant memory of up to 5 years in the Labrador and Irminger Seas. However, it is only around the northern rim of these seas that VIKING20 and the transport reconstruction exhibit similar memory. This is due to masking by the mean flow advection and eddy momentum flux contributions. ©2020. The Authors.
英文关键词	high-resolution model; North Atlantic; transport variability
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/186889
作者单位	Department of Oceanography, Dalhousie University, Halifax, NS, Canada; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Faculty of Mathematics and Natural Sciences, University of Kiel, Kiel, Germany
推荐引用方式 GB/T 7714	Wang Y.,Greatbatch R.J.,Claus M.,et al. Decomposing Barotropic Transport Variability in a High-Resolution Model of the North Atlantic Ocean[J],2020,125(5).
APA	Wang Y.,Greatbatch R.J.,Claus M.,&Sheng J..(2020).Decomposing Barotropic Transport Variability in a High-Resolution Model of the North Atlantic Ocean.Journal of Geophysical Research: Oceans,125(5).
MLA	Wang Y.,et al."Decomposing Barotropic Transport Variability in a High-Resolution Model of the North Atlantic Ocean".Journal of Geophysical Research: Oceans 125.5(2020).