Department of Estuarine and Ocean Sciences MS Thesis Defense-Nishchitha Etige
When: Tuesday,
June 4, 2019
11:00 AM
-
12:00 PM
Where: > See description for location
Description: The School for Marine Science and Technology
Department of Estuarine and Ocean Sciences
MS Thesis Defense Announcement
"Understanding Thirty-Eight Years of Gulf Stream's Warm Core Rings: Variability, Regimes, and Survival"
By
Nishchitha S. Etige
Advisor
Avijit Gangopadhyay
Committee
Dr. Gavin Fay
Dr. Glen Gawarkiewicz
Tuesday, June 4, 2019
11:00 am
SMAST East Rooms 101/102
836 S. Rodney French Blvd, New Bedford
Abstract:
Gulf Stream (GS) Warm Core Rings (WCRs) play a major role in distributing heat and salt over the shelf and slope seas. A database of WCR characteristics (date and location of formation/demise, and size at formation) was developed for the time period of 1980 to 2017 using a consistent and continuous set of GS charts. Using this consistent census, multiple analyses were carried out to understand the variability of WCR formations, detect regime shifts within the 38-year study period, and determine the survival rate of WCRs. WCR formations peak in late spring and early summer and there are few rings in winter. The same pattern of seasonality persisted on a sub-regional basis. More than 2/3rd of WCRs are formed to the east of 65° W. Large interannual variability observed during the 38-year time period for WCR formation motivated an analysis of potential regime change. A significant upward regime shift was detected from the year 2000. This regime change is pervasive in all four subregions. An increasing number of WCR formation, reduction in average lifespan, and an increased WCR impact time are observed during the 2000-2017 regime. Application of multiple survival analysis methods shows a higher survival probability for WCRs formed within the 70°W - 65°W longitude band. The radius of a WCR at formation, total distance traveled during the ring’s life, and latitude of formation - all have a significant effect on the survival of WCRs when a Cox proportional hazard model is employed for all WCRs in all regions.
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To access the live broadcasting, go to https://echo360.org/directLogin and click on "Alternate login". You will have to login as "smast@umassd.edu" with the password: smastumassd.
After login you will have to click on ALL CLASSES (MAR 700-01 - DEOS Seminar or MAR 700-02 - DFO Seminar) and click on the green LIVE streaming.
To view a video of an SMAST seminar (post-October 1, 2014), go to https://www.umassd.edu/smast/events/seminar-series/ and click on a highlighted title.
For additional information, please contact Sue Silva at s1silva@umassd.edu.
Department of Estuarine and Ocean Sciences
MS Thesis Defense Announcement
"Understanding Thirty-Eight Years of Gulf Stream's Warm Core Rings: Variability, Regimes, and Survival"
By
Nishchitha S. Etige
Advisor
Avijit Gangopadhyay
Committee
Dr. Gavin Fay
Dr. Glen Gawarkiewicz
Tuesday, June 4, 2019
11:00 am
SMAST East Rooms 101/102
836 S. Rodney French Blvd, New Bedford
Abstract:
Gulf Stream (GS) Warm Core Rings (WCRs) play a major role in distributing heat and salt over the shelf and slope seas. A database of WCR characteristics (date and location of formation/demise, and size at formation) was developed for the time period of 1980 to 2017 using a consistent and continuous set of GS charts. Using this consistent census, multiple analyses were carried out to understand the variability of WCR formations, detect regime shifts within the 38-year study period, and determine the survival rate of WCRs. WCR formations peak in late spring and early summer and there are few rings in winter. The same pattern of seasonality persisted on a sub-regional basis. More than 2/3rd of WCRs are formed to the east of 65° W. Large interannual variability observed during the 38-year time period for WCR formation motivated an analysis of potential regime change. A significant upward regime shift was detected from the year 2000. This regime change is pervasive in all four subregions. An increasing number of WCR formation, reduction in average lifespan, and an increased WCR impact time are observed during the 2000-2017 regime. Application of multiple survival analysis methods shows a higher survival probability for WCRs formed within the 70°W - 65°W longitude band. The radius of a WCR at formation, total distance traveled during the ring’s life, and latitude of formation - all have a significant effect on the survival of WCRs when a Cox proportional hazard model is employed for all WCRs in all regions.
*****************************************************************************
To access the live broadcasting, go to https://echo360.org/directLogin and click on "Alternate login". You will have to login as "smast@umassd.edu" with the password: smastumassd.
After login you will have to click on ALL CLASSES (MAR 700-01 - DEOS Seminar or MAR 700-02 - DFO Seminar) and click on the green LIVE streaming.
To view a video of an SMAST seminar (post-October 1, 2014), go to https://www.umassd.edu/smast/events/seminar-series/ and click on a highlighted title.
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