气候变化领域集成服务门户(CCPortal): Frontal Convergence and Vertical Velocity Measured by Drifters in the Alboran Sea

CCPortal

DOI	10.1029/2020JC016614
	Frontal Convergence and Vertical Velocity Measured by Drifters in the Alboran Sea
	Tarry D.R.; Essink S.; Pascual A.; Ruiz S.; Poulain P.-M.; Özgökmen T.; Centurioni L.R.; Farrar J.T.; Shcherbina A.; Mahadevan A.; D’Asaro E.
发表日期	2021
ISSN	21699275
卷号	126 期号:4
英文摘要	Horizontal and vertical motions associated with mesoscale (10–100 km) and submesoscale (1–10 km) features, such as fronts, meanders, eddies, and filaments, play a critical role in redistributing physical and biogeochemical properties in the ocean. This study makes use of a multiplatform data set of 82 drifters, a Lagrangian float, and profile timeseries of temperature and salinity, obtained in a ∼1-m/s semipermanent frontal jet in the Alboran Sea as part of CALYPSO (Coherent Lagrangian Pathways from the Surface Ocean to Interior). Drifters drogued at ∼1-m and 15-m depth capture the mesoscale and submesoscale circulation aligning along the perimeter of fronts due to horizontal shear. Clusters of drifters are used to estimate the kinematic properties, such as vorticity and divergence, of the flow by fitting a bivariate plane to the horizontal drifter velocities. Clusters with submesoscale length scales indicate normalized vorticity ζ/f > 1 with Coriolis frequency f and normalized divergence of (Formula presented.) (1) occurring in patches along the front, with error variance around 10%. By computing divergence from drifter clusters at two different depths, we estimate minimum vertical velocity of (Formula presented.) (−100 m day−1) in the upper 10 m of the water column. These results are at least twice as large as previous estimates of vertical velocity in the region. Location, magnitude, and timing of the convergence are consistent with behavior of a Lagrangian float subducting in the center of a drifter cluster. These results improve our understanding of frontal subduction and quantify convergence and vertical velocity using Lagrangian tools. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Alboran Sea; drifters; kinematic properties; Lagrangian float; submesoscale; vertical velocity
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/186378
作者单位	IMEDEA (CSIC-UIB), Esporles, Spain; Applied Physics Laboratory, University of Washington, Seattle, WA, United States; NATO-STO-CMRE, La Spezia, Italy; Department of Ocean Sciences, University of Miami, Miami, FL, United States; Scripps Institution of Oceanography, University of California-San Diego, La Jolla, CA, United States; Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
推荐引用方式 GB/T 7714	Tarry D.R.,Essink S.,Pascual A.,et al. Frontal Convergence and Vertical Velocity Measured by Drifters in the Alboran Sea[J],2021,126(4).
APA	Tarry D.R..,Essink S..,Pascual A..,Ruiz S..,Poulain P.-M..,...&D’Asaro E..(2021).Frontal Convergence and Vertical Velocity Measured by Drifters in the Alboran Sea.Journal of Geophysical Research: Oceans,126(4).
MLA	Tarry D.R.,et al."Frontal Convergence and Vertical Velocity Measured by Drifters in the Alboran Sea".Journal of Geophysical Research: Oceans 126.4(2021).