globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-016-3193-5
Scopus记录号: 2-s2.0-84973125334
论文题名:
Spatio-temporal characteristics of Agulhas leakage: a model inter-comparison study
作者: Holton L.; Deshayes J.; Backeberg B.C.; Loveday B.R.; Hermes J.C.; Reason C.J.C.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期:2017-07-08
起始页码: 2107
结束页码: 2121
语种: 英语
英文关键词: Agulhas leakage ; Agulhas system ; Climate ; Model inter-comparison ; Ocean variability
英文摘要: Investigating the variability of Agulhas leakage, the volume transport of water from the Indian Ocean to the South Atlantic Ocean, is highly relevant due to its potential contribution to the Atlantic Meridional Overturning Circulation as well as the global circulation of heat and salt and hence global climate. Quantifying Agulhas leakage is challenging due to the non-linear nature of this process; current observations are insufficient to estimate its variability and ocean models all have biases in this region, even at high resolution. An Eulerian threshold integration method is developed to examine the mechanisms of Agulhas leakage variability in six ocean model simulations of varying resolution. This intercomparison, based on the circulation and thermohaline structure at the Good Hope line, a transect to the south west of the southern tip of Africa , is used to identify features that are robust regardless of the model used and takes into account the thermohaline biases of each model. When determined by a passive tracer method, 60 % of the magnitude of Agulhas leakage is captured and more than 80 % of its temporal fluctuations, suggesting that the method is appropriate for investigating the variability of Agulhas leakage. In all simulations but one, the major driver of variability is associated with mesoscale features passing through the section. High resolution (< 1 / 10 ∘) hindcast models agree on the temporal (2–4 cycles per year) and spatial (300–500 km) scales of these features corresponding to observed Agulhas Rings. Coarser resolution models (< 1 / 4 ∘) reproduce similar time scale of variability of Agulhas leakage in spite of their difficulties in representing the Agulhas rings properties. A coarser resolution climate model (2 ∘) does not resolve the spatio-temporal mechanism of variability of Agulhas leakage. Hence it is expected to underestimate the contribution of Agulhas Current System to climate variability. © 2016, Springer-Verlag Berlin Heidelberg.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53294
Appears in Collections:过去全球变化的重建

Files in This Item:

There are no files associated with this item.


作者单位: Department of Oceanography, University of Cape Town, Cape Town, South Africa; Laboratoire LOCEAN/IPSL, Sorbonne Universits (UPMC Univ, Paris 06)-CNRS-IRD-MNHN, 4 Place Jussieu, Paris, France; ICEMASA, Department of Oceanography, University of Cape Town, Cape Town, South Africa; Nansen-Tutu Centre for Marine Environmental Research, Marine Research Institute, Bergen, Norway; Nansen Environmental and Remote Sensing Center, Bergen, Norway; Remote Sensing Group, Plymouth Marine Laboratory, Prospect Place, Plymouth, United Kingdom; Coastal Systems Research Group, Council for Scientific and Industrial Research, Natural Resources and the Environment, Cape Town, South Africa; South African Environmental Observation Network, Grahamstown, South Africa

Recommended Citation:
Holton L.,Deshayes J.,Backeberg B.C.,et al. Spatio-temporal characteristics of Agulhas leakage: a model inter-comparison study[J]. Climate Dynamics,2017-01-01,48(2017-07-08)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Holton L.]'s Articles
[Deshayes J.]'s Articles
[Backeberg B.C.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Holton L.]'s Articles
[Deshayes J.]'s Articles
[Backeberg B.C.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Holton L.]‘s Articles
[Deshayes J.]‘s Articles
[Backeberg B.C.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.