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Van Tuyl Lecture: Frank Pavia, CalTech
December 1, 2022 @ 4:00 pm - 5:00 pm
Frank Pavia, CalTech
Berthoud 241/ Zoom, Thursday, December 1, 2022
New Helium Isotope Tracers of Polar Ice Dynamics
Abstract: Understanding how both sea ice and ice sheets respond to climatic change is hampered by a paucity of sedimentary proxies ice dynamics for the geologic past. In this talk I will present new work calibrating and applying geochemical proxies for sea ice coverage and ice sheet melt rates based on measurements of helium isotopes in marine sediments. The first part of this work demonstrates how helium isotopes can be used to distinguish intervals of permanent sea ice coverage, and presents a history of Arctic Ocean sea ice coverage for the last 50,000 years. The second part of this talk will show the first steps toward using helium isotopes in ice proximal sediments near the West Antarctic Ice Sheet to constrain past melting rates.
This lecture is scheduled in a hybrid format. If you would like to join the meeting please:
Join from PC, Mac, Linux, iOS or Android: https://mines.zoom.us/j/98439391529?pwd=d3hGZFVVWjlWb1RtK3VMWXMxSytDdz09
Password: 611070
The Van Tuyl lectures are scheduled at 4-5pm in BE 241/ Zoom (hybrid format), and after the lecture there will be a get-together from 5-6pm in BE 243 with pizza and sodas.