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The Zealandia Switch: Ice age climate shifts viewed from Southern Hemisphere moraines

Seminar by David Barrell, GNS Science

A detailed chronology of Southern Alps mountain-glacier moraines from cosmogenic surface exposure dating highlights a long-standing climatic puzzle; orbitally-controlled variations in solar energy are antiphased between the hemispheres, but ice-age climate shifts were globally synchronous.

The Zealandia Switch hypothesis proposes a central role for the Southern Hemisphere mid-latitude westerly wind belt in glacial-interglacial climate shifts. Rapid spread of southern climate signatures via atmospheric and oceanic processes can account for global climate mode shifts and the so-called bipolar seesaw.

Date Wednesday, 28 July 2021
Time 1:00pm - 2:00pm
Audience Public,All University,Undergraduate students,Postgraduate students,Staff,Alumni,Other
Event Category Sciences
Event Type Seminar
CampusDunedin
DepartmentGeology
LocationBenson Common Room (Gn9), Geology Building, University of Otago, Dunedin.
CostFree
Contact NameGeology Office
Contact Emailgeology@otago.ac.nz

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