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Department of Estuarine and Ocean Sciences PhD Proposal Defense by Adrienne M. Silver

When: Friday, November 12, 2021
10:00 AM - 11:00 AM
Where: > See description for location
Description: The School for Marine Science and Technology
Department of Estuarine and Ocean Sciences
PhD Proposal Defense

"A Multiscale and Multidisciplinary Look at the Gulf Stream System, Its Rings and Their Impacts"

By
Adrienne M. Silver

Advisor
Avijit Gangopadhyay, School for Marine Science and Technology, UMass Dartmouth

Committee
Steve Lohrenz, School for Marine Science and Technology, UMass Dartmouth
Gavin Fay, School for Marine Science and Technology, UMass Dartmouth
Glen Gawarkiewicz, Woods Hole Oceanographic Institution
Magdalena Andres, Woods Hole Oceanographic Institution

Friday, November 12, 2021
10:00 am to 11:00 am
SMAST East, Rooms 101,102,103
Also on Zoom

Abstract
In recent years the Gulf Stream system has been observed to undergo changes at both the climatological and synoptic time scales. The Stream has been proposed to be slowing (Caesar et al., 2021; Piecuch, 2020), the destabilization point has moved westward (Andres, 2016), and the number of annual Warm Core Ring formations has doubled after the year 2000 (Gangopadhyay et al., 2019). These changes within the Gulf Stream system have large implications for large-scale climate phenomena as well as impacting local ecosystems and coastal communities. Through this work I propose to address three main questions regarding the Gulf Stream system and its rings, each with distinct spatial and temporal scales. The first question focuses on the Gulf Stream system as a whole, examining ring formation and instability processes within the Stream. This section aims to answer the question of what drives the Stream to form a Warm versus a Cold Core Ring. Preliminary results have found several asymmetries in ring formation between Warm and Cold Core Rings at both seasonal and interannual time-scales (Silver et al., 2021a). Additionally, a Gulf Stream North Wall forecasting model was created (Silver et al., 2021b) using wind and buoyancy forcing from the previous three years. Future work will use sea surface satellite tracks and ARGO floats to examine the Stream instability processes (baroclinic and barotropic) to see what drives the observed asymmetries. To address the second question, we follow a Warm Core Ring as it moves through the Slope Sea along the Ring Corridor. This section aims to understand how ring characteristics change with age and location. Using ARGO floats and a newly generated Warm Core Ring Tracking dataset, ring properties at depth can be examined as they travel throughout the Slope Sea. The third question is focused on characterizing the impact of a Warm Core Ring hitting the shelf break. When a Warm Core Ring hits the shelf several exchange processes can occur such as shelf streamers, salinity maximum intrusions, and Pinocchio's nose intrusions. These processes can push warm salty water onto the shelf, or pull cold fresh water off the shelf. The impact of these exchange processes on Zooplankton populations will be examined using ECOMON and ARGO data along with the previously mentioned Warm Core Ring tracking dataset.
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​For additional information, please contact Sue Silva at s1silva@umassd.edu
Contact: > See Description for contact information
Topical Areas: School for Marine Sciences and Technology, SMAST Seminar Series