气候变化领域集成服务门户(CCPortal): Submesoscale Features and Turbulent Mixing of an Oblique Anticyclonic Eddy in the Gulf of Alaska Investigated by Marine Seismic Survey Data

CCPortal

DOI	10.1029/2019JC015393
	Submesoscale Features and Turbulent Mixing of an Oblique Anticyclonic Eddy in the Gulf of Alaska Investigated by Marine Seismic Survey Data
	Tang Q.; Gulick S.P.S.; Sun J.; Sun L.; Jing Z.
发表日期	2020
ISSN	21699275
卷号	125 期号:1
英文摘要	Mesoscale eddies are ubiquitous in the global ocean and can be captured by marine multichannel seismic surveys. In this study, a short-lived anticyclonic eddy is characterized along the seismic line STEEP11 acquired on 30 September 2008 in northern Gulf of Alaska. Fine-scale eddy stratification with alternative strong striae and weak layers is regarded as a typical eddy structure of the study region. The eddy center dips along a NW tilted axis of 1.9 ± 0.2° from the horizontal. Submesoscale structures including fronts and filaments coexist around the eddy periphery and dominate ~70% of the eddy volume. The estimated geostrophic current is asymmetric and ageostrophic components must play a significant role in balancing the eddy system. Nonlinearity of the eddy is strong as its rotation speed is much higher than its translation speed. We suggest that Ekman transport is probably responsible for the skewed shape with regards to the asymmetric geostrophic current and asymmetric submesoscale processes. Detailed turbulent diffusivities in and around the eddy are quantified, with an average level of 6.5 × 10−5 m2 s−1. The diapycnal diffusivities show an increasing pattern from the eddy center to the surrounding water. With the pervasive submesoscale processes as the transitional dynamics, a forward cascade of energy could be expected from the mesoscale eddy to the fine-scale wave-breaking and turbulence. The irregular vortex structure may reduce the structural stability, facilitate the energy conversion, and accelerate the eddy dissipation. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	Gulf of Alaska; mesoscale structure; seismic oceanography; submesoscale feature; tilting eddy; turbulent mixing
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/187023
作者单位	CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou, China; Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, China
推荐引用方式 GB/T 7714	Tang Q.,Gulick S.P.S.,Sun J.,et al. Submesoscale Features and Turbulent Mixing of an Oblique Anticyclonic Eddy in the Gulf of Alaska Investigated by Marine Seismic Survey Data[J],2020,125(1).
APA	Tang Q.,Gulick S.P.S.,Sun J.,Sun L.,&Jing Z..(2020).Submesoscale Features and Turbulent Mixing of an Oblique Anticyclonic Eddy in the Gulf of Alaska Investigated by Marine Seismic Survey Data.Journal of Geophysical Research: Oceans,125(1).
MLA	Tang Q.,et al."Submesoscale Features and Turbulent Mixing of an Oblique Anticyclonic Eddy in the Gulf of Alaska Investigated by Marine Seismic Survey Data".Journal of Geophysical Research: Oceans 125.1(2020).