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SUMMARY:Rivers and climate change: three short stories of their partnershi
 p - Andrew Wickert\, University of Minnesota
DTSTART:20170523T110000Z
DTEND:20170523T120000Z
UID:TALK70495@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:Ask any geomorphologist about the effect of climate change on 
 river systems\, and you'll soon be deep in a conversation about valleys\, 
 terraces\, sediment supply\, floods\, and the forces that climate change c
 an exert on the fluvial system. Mention rivers to global climate scientist
 s\, and you may hear how changing patterns of freshwater discharge to the 
 ocean through the global river networks can drastically affect ocean circu
 lation and global climate. These two links between the fluvial and climate
  systems\, in which they each have their turn in the driver's seat\, are o
 ften investigated in isolation by practitioners of these two subfields wit
 hin Earth Sciences. In my talk\, I will link them through three vignettes.
  First\, I will present how ice-sheet advance and retreat rerouted rivers 
 across North America (and the globe)\, changing positions of meltwater dis
 charge to the sea\, and therefore impacting the climate that fed back into
  the ice sheets and rivers. Second\, I will zoom in on the Mississippi Riv
 er\, whose modern form was created by the ice sheets\, and still aggrades 
 and incises with the pulse of ice-sheet advance and retreat and meltwater 
 delivery to the Atlantic. Finally\, I will demonstrate that the width-evol
 ution of alluvial rivers may cause different systems to evolve along diver
 gent paths\, with the Upper Mississippi and the Quebrada del Toro\, Argent
 ina\, as both inspiration and study sites for hypothesis testing.\n\n
LOCATION:Tilley Lecture Theatre\, Department of Earth Sciences
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