气候变化领域集成服务门户(CCPortal): Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric-Resolution Ocean Models

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DOI	10.1029/2019JC015827
	Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric-Resolution Ocean Models
	Ajayi A.; Le Sommer J.; Chassignet E.; Molines J.-M.; Xu X.; Albert A.; Cosme E.
发表日期	2020
ISSN	21699275
卷号	125 期号:5
英文摘要	Ocean circulation is dominated by turbulent geostrophic eddy fields with typical scales ranging from 10 to 300 km. At mesoscales (>50 km), the size of eddy structures varies regionally following the Rossby radius of deformation. The variability of the scale of smaller eddies is not well known due to the limitations in existing numerical simulations and satellite capability. Nevertheless, it is well established that oceanic flows (<50 km) generally exhibit strong seasonality. In this study, we present a basin-scale analysis of coherent structures down to 10 km in the North Atlantic Ocean using two submesoscale-permitting ocean models, a NEMO-based North Atlantic simulation with a horizontal resolution of 1/60 (NATL60) and an HYCOM-based Atlantic simulation with a horizontal resolution of 1/50 (HYCOM50). We investigate the spatial and temporal variability of the scale of eddy structures with a particular focus on eddies with scales of 10 to 100 km, and examine the impact of the seasonality of submesoscale energy on the seasonality and distribution of coherent structures in the North Atlantic. Our results show an overall good agreement between the two models in terms of surface wave number spectra and seasonal variability. The key findings of the paper are that (i) the mean size of ocean eddies show strong seasonality; (ii) this seasonality is associated with an increased population of submesoscale eddies (10–50 km) in winter; and (iii) the net release of available potential energy associated with mixed layer instability is responsible for the emergence of the increased population of submesoscale eddies in wintertime. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	eddies; enstrophy; fine-scales; submesoscales; SWOT
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/186862
作者单位	Universite Grenoble Alpes /CNRS/IGE, Grenoble, France; Florida State University, Tallahassee, FL, United States
推荐引用方式 GB/T 7714	Ajayi A.,Le Sommer J.,Chassignet E.,et al. Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric-Resolution Ocean Models[J],2020,125(5).
APA	Ajayi A..,Le Sommer J..,Chassignet E..,Molines J.-M..,Xu X..,...&Cosme E..(2020).Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric-Resolution Ocean Models.Journal of Geophysical Research: Oceans,125(5).
MLA	Ajayi A.,et al."Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric-Resolution Ocean Models".Journal of Geophysical Research: Oceans 125.5(2020).