气候变化领域集成服务门户(CCPortal): Quantifying the Impact of Wind-Current Feedback on Mesoscale Variability in Forced Simulation Experiments of the Agulhas Current Using an Eddy-Tracking Algorithm

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DOI	10.1029/2019JC015365
	Quantifying the Impact of Wind-Current Feedback on Mesoscale Variability in Forced Simulation Experiments of the Agulhas Current Using an Eddy-Tracking Algorithm
	Braby L.; Backeberg B.; Krug M.; Reason C.
发表日期	2020
ISSN	21699275
卷号	125 期号:1
英文摘要	The variability in the source regions of the Agulhas Current is influenced by mesoscale eddies. While existing numerical models are successfully able to capture many aspects of the Agulhas Current, many models are unable to accurately represent the observed eddy dissipation and interaction processes, affecting our understanding of mesoscale variability within the current. In this study, we compare two forced simulation experiments in a regional Hybrid Coordinate Ocean Model (HYCOM), where we change the wind forcing, and using an eddy-tracking algorithm quantify the local effect of the changed wind stress on source region eddies and their interaction with the northern Agulhas Current. There is an overall reduction in eddy kinetic energy (EKE) over the domain, and the representation of Agulhas Current velocities are improved. This study shows that the contribution of meanders and small eddies to the total EKE of the region is greater than the EKE contribution from tracked mesoscale eddies. Changes in eddy properties resulting from the change in forcing from absolute to relative winds (the wind speed relative to the current speed) have resulted in significantly different mesoscale eddy properties. Finally, the evolution of meanders in the Agulhas Current, including the frequency and dissipation of smaller meanders and Natal Pulse type meanders, was assessed using HYCOM experiments and compared to satellite observations. The simulated frequency of smaller meanders compares more favorably to the observations with the change in wind forcing. However, larger Agulhas Current meanders are now too infrequent in the regional HYCOM. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	Agulhas Current; eddy kinetic energy; eddy tracking; meanders; mesoscale eddies; wind forcing
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/187018
作者单位	Department of Oceanography, University of Cape Town, Cape Town, South Africa; Nansen Environmental and Remote Sensing Center, Bergen, Norway; Nansen-Tutu Centre for Marine Environmental Research, University of Cape Town, Cape Town, South Africa; Ecosystem Earth Observation Research Group, Council for Scientific and Industrial Research, Natural Resources and the Environment, Cape Town, South Africa
推荐引用方式 GB/T 7714	Braby L.,Backeberg B.,Krug M.,et al. Quantifying the Impact of Wind-Current Feedback on Mesoscale Variability in Forced Simulation Experiments of the Agulhas Current Using an Eddy-Tracking Algorithm[J],2020,125(1).
APA	Braby L.,Backeberg B.,Krug M.,&Reason C..(2020).Quantifying the Impact of Wind-Current Feedback on Mesoscale Variability in Forced Simulation Experiments of the Agulhas Current Using an Eddy-Tracking Algorithm.Journal of Geophysical Research: Oceans,125(1).
MLA	Braby L.,et al."Quantifying the Impact of Wind-Current Feedback on Mesoscale Variability in Forced Simulation Experiments of the Agulhas Current Using an Eddy-Tracking Algorithm".Journal of Geophysical Research: Oceans 125.1(2020).