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Dorr Lecture: Erosion Rates and Climate from the Cosmogenic Nuclide Perspective

Darryl Granger, Purdue University
Friday, March 17, 2017
3:30-4:30 PM
1528 C.C. Little Building Map
The importance of climate in regulating erosion and weathering rates remains surprisingly controversial.  While there is little doubt that extreme climates matter--erosion is slow in hyperarid deserts and rapid in glaciated terrain--the variability of erosion in more temperate climate regimes remains difficult to constrain.  Over the past 15 years cosmogenic nuclides have been used to measure erosion rates in a variety of settings around the globe, leading to the broad conclusion that climate is far less important than previously assumed.  More recently, however, time series of paleo-erosion rates measured with cosmogenic nuclides have shown significant changes in erosion rate across glacial-interglacial transitions at mid-latitudes.  These newer studies point to changes in physical erosion processes that enhance erosion in cold climates beyond the ice margin.  I will present a synthesis of paleo-erosion rates measured at sites from a variety of climate regimes, showing that climatic effects are important at mid-latitudes but subtle in other parts of the world.
Building: C.C. Little Building
Event Type: Lecture / Discussion
Tags: Lecture
Source: Happening @ Michigan from Earth and Environmental Sciences