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A double-thermostad warm-core ring of the Gulf Stream

Citation

Belkin, I and Foppert, A and Rossby, T and Fontana, S and Kincaid, C, A double-thermostad warm-core ring of the Gulf Stream, Journal of Physical Oceanography, 50, (2) pp. 489-507. ISSN 0022-3670 (2020) [Refereed Article]

Copyright Statement

copyright 2020 American Meteorological Society

DOI: doi:10.1175/JPO-D-18-0275.1

Abstract

An unusual double-thermostad warm-core ring of the Gulf Stream was discovered in the Slope Sea, south of Georges Bank, during the R/V Endeavor cruise 578 in May 2016. The rings stratification was peculiar as it included two thermostads at, respectively, 100200 m (core T = 18.14C, S = 36.52) and 250500 m (core T = 16.70C, S = 36.35). Extensive use of satellite data (SST imagery and SSH maps) allowed the life history of this ring to be reconstructed, with independent SST and SSH data mutually corroborating each other. The double-thermostad ring was formed by vertical alignment of two preexisting warm-core anticyclonic rings of the Gulf Stream. The first ring spawned by the Gulf Stream in February has cooled by ~2C before merging in April with the second ring spawned by the Gulf Stream in March. During vertical alignment of these rings, the warmer ring overrode the colder ring, thereby forming the double-thermostad ring surveyed in May 2016. From ADCP sections through the ring, the upper and lower thermostads had different core relative vorticities of −0.65f and −0.77f, respectively, where f is the local Coriolis parameter. An in-depth literature survey has confirmed that this is the first report of a double-thermostad warm-core ring of the Gulf Stream and one of the best-documented cases of vertical alignment of two eddies ever observed in the World Ocean.

Item Details

Item Type:Refereed Article
Keywords:Gulf Stream, North Atlantic, eddies, eddy structure
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Understanding climate change not elsewhere classified
UTAS Author:Foppert, A (Dr Annie Foppert)
ID Code:140525
Year Published:2020
Web of Science® Times Cited:2
Deposited By:Australian Antarctic Program Partnership
Deposited On:2020-08-25
Last Modified:2020-09-10
Downloads:0

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