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Department of Estuarine and Ocean Sciences Seminar - Dr. Ke Chen

When: Wednesday, January 19, 2022
12:30 PM - 1:30 PM
Where: > See description for location
Description: The School for Marine Science and Technology
Department of Estuarine and Ocean Sciences
Seminar Announcement

"Eddies and wind drive a localized cross-shelf bottom intrusion"

Dr. Ke Chen
Physical Oceanography
Woods Hole Oceanographic Institution

Wednesday, January 19, 2022
12:30 pm to 1:30 pm
SMAST East Rooms 101/102
And Via Zoom

Observations and high-resolution numerical modeling are used to investigate the dynamical processes related to the initiation of an advective Marine Heatwave in the Middle Atlantic Bight of the Northwest Atlantic continental shelf. Both the observations and the model identify two significant cross-shelf intrusions in November 2016 and January 2017, with the latter inducing large-magnitude water mass anomalies across the shelf. Model prognostic fields reveal the importance of the combination of cyclonic eddies or ringlets and upwelling-favorable winds in producing the large-distance cross-shelf penetration and temperature/salinity anomalies. The cyclonic eddies in close proximity to the shelfbreak set up local along-isobath pressure gradients and provide favorable conditions for the intensification of the shelfbreak front, both processes driving cross-isobath intrusions of warm, salty offshore water onto the outer continental shelf. Subsequently, strong and persistent upwelling-favorable winds drive a rapid, bottom intensified cross-shelf penetration in January 2017 composed of the anomalous water mass from the cyclonic eddies. The along-shelf settings including realistic representation of bathymetric features are essential in the characteristics of the cross-shelf penetration. The results highlight the importance of smaller scale cyclonic eddies and the intricacy of the interplay between multiple processes to drive significant cross-shelf events.

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Meeting ID: 974 4006 9270
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Topical Areas: School for Marine Sciences and Technology, SMAST Seminar Series