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Department of Fisheries Oceanography PhD Dissertation Defense by Deshuai Wang
- Location: > See description for location
- Contact: > See Description for contact information
- Description: The School for Marine Science and Technology
Department of Fisheries Oceanography
PhD Dissertation Defense Announcement
"Impacts of Climate Change on Interannual Variability of Beaufort Gyre Circulation and Freshwater Content in the Arctic Ocean"
By
Deshuai Wang
Advisor:
Dr. Changsheng Chen, Professor and Montgomery Chair,
Department of Fisheries Oceanography, School for Marine Science and Technology
Committee Members:
Dr. Geoffrey Cowles, Assoc. Professor, Department of Fisheries Oceanography,
School for Marine Science and Technology, University of Massachusetts Dartmouth
Dr. Jianhua Qi, Research Associate Professor, Department of Fisheries Oceanography, School for Marine Science and Technology, University of Massachusetts Dartmouth
Dr. Sylvia Cole, Assoc. Scientist, Department of Physical Oceanography,
Woods Hole Oceanographic Institution
Dr. Rubao Ji, Senior Scientist, Department of Biology,
Woods Hole Oceanographic Institution
Wednesday, December 22, 2021
12:00 pm
SMAST East, Rooms 101/102
836 S Rodney French Blvd, New Bedford
And via Zoom
Abstract
My Ph.D. dissertation research is aimed investigate the impact of global warming on the variability of sea ice in the Arctic Ocean and freshwater content in the Beaufort Gyre region. The seasonal and interannual variability of sea ice, current, and freshwater in the Arctic Ocean was studied using a 41-year hindcast simulation by FVCOM for the period 1978-2018. Not only in seasonal and interannual variability, but also in spatial distribution, the model-simulated sea ice was in good agreement with the observed sea ice extent, concentration, drift velocity, and thickness. The drop in both sea ice extent and thickness, as well as freshwater accumulation, has been one of the most remarkable observations in the Beaufort Gyre (BG) region of the Arctic. The results of the 41-year hindcast simulation show that the BG's major rise in freshwater accumulation began in 2007, and Ekman pumping is a primary physical mechanism for regional interannual fluctuation in freshwater content. The Community Earth System Model (CESM) predicts that the yearly-mean air temperature, net heat flux, and river runoff in the Arctic will increase by 0.12℃, 0.06 W/m2, and 0.03x104 m3/s, respectively. We used the AO-FVCOM simulation for 2025 and 2050 to project the impact of global warming on future Arctic Ocean conditions, considering the CEMS-RCP8.5-projected increases in air temperature, heat flux, and river runoff. Comparing the 2050 simulations with the 2018 situation, the sea ice extent in the Beaufort Sea will be drastically reduced, with a maximum of -6x106 km2 happening in August and September. The annual mean sea surface temperature will rise by 0.4-0.8 ℃. The Arctic Ocean will become significantly fresher. The highest salinity loss at the sea surface can surpass 2 psu, especially in the summer and autumn. Increased river runoff and a significant drop in sea ice will exacerbate coastal and slope currents up to 10 cm/s. The Beaufort Gyre will be stabilized because of global warming, which will increase the seasonal variability of the circulation in the Arctic Ocean. Freshwater content in the Beaufort Gyre region will increase because of net advective freshwater inflow from the slope in the spring and a net Ekman pumping-induced freshwater flux via the lateral freshwater flux from summer to fall.
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- Topical Areas: School for Marine Sciences and Technology, SMAST Seminar Series
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