Dorr Lecture: Erosion Rates and Climate from the Cosmogenic Nuclide Perspective
Darryl Granger, Purdue University
Friday, March 17, 2017
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|
|Source:||Happening @ Michigan from Earth and Environmental Sciences|