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Department of Estuarine and Ocean Sciences Special Seminar Announcement - Tony Wang

When: Wednesday, December 8, 2021
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
Special Seminar Announcement

"The Role of Nutrient Cycling in Ocean Deoxygenation: From Late Miocene to Anthropocene"

Xingchen (Tony) Wang
Department of Earth and Environmental Sciences
Boston College

Wednesday, December 8, 2021
12:30 pm to 1:30 pm
SMAST East Rooms 101/102
And Via Zoom

Abstract
The modern Pacific Ocean hosts the largest oxygen-deficient zones (ODZs), in which nitrate is used to respire organic matter. The history of the ODZs may offer key insights into ocean deoxygenation under future global warming. In this talk, I will present a 12-million-year (Ma) foraminifera-bound nitrogen isotope record from the southeastern Pacific, which shows a >10‰ increase since late Miocene time (8-9 Ma ago), indicating large ODZs expansion. Coinciding with this change, we find a major increase in the ocean’s nutrient content, reconstructed from P and Fe measurements of hydrothermal sediments at the same site. Whereas global warming studies cast seawater O2 concentrations as mainly dependent on climate and ocean circulation, our findings indicate that modern ODZs are underpinned by historically high concentrations of seawater nutrients. I will also discuss the implications of these findings for today’s coastal hypoxic zones, which are mainly caused by the input of anthropogenic nutrients.

Biography
Xingchen (Tony) Wang is an Assistant Professor in the Department of Earth and Environmental Sciences at Boston College. He received his Ph.D. in Geosciences at Princeton University in 2016, followed by three years’ postdoctoral research at the California Institute of Technology. His research focuses on using stable isotopes to better understand the ocean’s biogeochemical cycles, their
interactions with climate, and their implications for Earth’s habitability and the evolution of life. He was a Charlotte Elizabeth Procter Honorific Fellow at Princeton University, a Schlanger Fellow of the International Ocean Discovery Program, and a Simons Foundation Postdoctoral Fellow.
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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