Phys Ocean Lunch Seminar, 2 Dec 2020

Wednesday, December 02, 2020

Physical Oceanography Lunch Seminar
Development of ocean simulation with focuses on the interaction between the Southern Ocean and East and West Antarctic ice shelves

Yoshihiro Nakayama
Hokkaido University

12:30 P.M., via Zoom
Join Zoom Meeting (more Zoom info below the Abstract)
https://washington.zoom.us/j/94332634535

ABSTRACT:

Ice shelves and glaciers of the West Antarctic Ice Sheet are melting and thinning rapidly in the Amundsen and Bellingshausen Seas, with consequences for global sea-level rise and changes in ocean circulation and marine ecosystems. Recently, a few glaciers in the East Antarctica are receiving increasing attention for their ice loss and warm oceanographic conditions observed at their ice shelf fronts. 

The reason for the high basal melting is warm modified Circumpolar Deep Water that intrudes via submarine glacial troughs located at the continental shelf break and flows into ice shelf cavities. This warm Circumpolar Deep Water reaches the grounding line, melts the glacier, and forms a buoyant mixture of Circumpolar Deep Water and meltwater, which spreads further downstream. Although it may seem simple, many different processes (e.g., large-scale atmosphere and ocean circulations, cross-shelf exchange, thermocline depth, cavity bathymetry, and air-sea interactions) control ice-shelf melt rates and thus the evolution of ice shelves and glaciers.

In this seminar, I will present the current understanding of how Circumpolar Deep Water intrudes onto the continental shelves, how it flows into ice-shelf cavities and interacts with ice shelves, and how glacial meltwater travels out. Further, we review existing observations and results from numerical simulations and discuss past and possible future evolutions of ice shelves and glaciers in Antarctica.


Zoom Meeting ID: 943 3263 4535
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Meeting ID: 943 3263 4535
Find your local number: https://washington.zoom.us/u/abJxDsiNu
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