Impact of Gulf Stream Warm-Core Rings on Slope Water Intrusion into the Gulf of Maine

Author:

Du Jiabi1,Zhang Weifeng (Gordon)1,Li Yizhen2

Affiliation:

1. a Applied Ocean Physics and Engineering Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts

2. b CSS Inc. at NOAA/National Centers for Coastal Ocean Science, Silver Spring, Maryland

Abstract

Abstract Intruding slope water is a major source of nutrients to sustain the high biological productivity in the Gulf of Maine (GoM). Slope water intrusion into the GoM is affected by Gulf Stream warm-core rings (WCRs) impinging onto the nearby shelf edge. This study combines long-term mooring measurements, satellite remote sensing data, an idealized numerical ocean model, and a linear coastal-trapped wave (CTW) model to examine the impact of WCRs on slope water intrusion into the GoM through the Northeast Channel. Analysis of satellite sea surface height and temperature data shows that the slope sea region off the GoM is a hotspot of ring activities. A significant linear relationship is found between interannual variations of ring activities in the slope sea region off the GoM and bottom salinity at the Northeast Channel, suggesting the importance of WCRs in modulating variability of intruding slope water. Analysis of the mooring data reveals enhanced slope water intrusion through bottom-intensified along-channel flow following impingements of WCRs on the nearby shelf edge. Numerical simulations qualitatively reproduce the observed WCR impingement processes and associated episodic enhancement of slope water intrusion in the Northeast Channel. Diagnosis of the model result indicates that baroclinic CTWs excited by the ring–topography interaction are responsible for the episodically intensified subsurface along-channel inflow, which carries more slope water into the GoM. A WCR that impinges onto the shelf edge to the northeast of the Northeast Channel tends to generate stronger CTWs and cause stronger enhancement of the slope water intrusion into the GoM.

Publisher

American Meteorological Society

Subject

Oceanography

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4. Interannual variability of Gulf Stream warm-core ring interactions with the outer continental shelf and potential broad scale relationships with longfin squid (Doryteuthis pealeii) relative abundance, 1981–2004;Bisagni, J. J.,2019

5. Mechanism for the recent ocean warming events on the Scotian Shelf of eastern Canada;Brickman, D.,2018

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