Paleo and Polar Climate Brownbag Seminar - John Kutzbach

Early hominid migrations out of Africa: the possible role of orbitally-forced changes in NH summer monsoons and winter storm tracks on precipitation and vegetation
 
John Kutzbach
University of Wisconsin-Madison
 
Abstract:
Ongoing archeological research identifies potential corridors for migration out of Africa in the eastern Sahara or the Arabian Peninsula. The dated archeological records are far from
complete put some dates are from the last interglacial and others continue through the entire glacial period. Climate model simulations (CCSM3 and CCSM4) for times of high insolation seasonality, insolation maxima in NH summer and insolation minima in NH winter, indicate, respectively, stronger northern summer monsoons AND stronger northern winter Mediterranean storm tracks. Glacial conditions also strengthened the Med. storm track while having relatively small impacts on the African summer monsoon. The combination of these responses produced more precipitation and increased vegetation along the potential migration corridors at ~ 125, 105. 80, 60-20, and 10ka. The episodic periods of a greener north-south corridor were not necessarily the cause of the migrations, but more favorable climate/vegetation might have been a supporting factor. Paleoclimatic observations from pollen cores, marine sediment cores, and speleothems lend some support to the simulated climate.
 
Tuesday, 31 July 2018
12:00 - 1:00 pm
Mesa Lab, 1850 Table Mesa Drive, Boulder, CO
ML-239 – Damon Room
 
Seminar will not be webcast
For more information, please contact Teresa Foster, teresaf@ucar.edu, 303-497-1741
 

 

Building:

Room Number: 
ML-239 Damon Room

Type of event:

Will this event be webcast to the public by NCAR|UCAR?: 
No
Announcement Timing: 
Monday, July 9, 2018
Calendar Timing: 
Tuesday, July 31, 2018 - 12:00pm to 1:00pm

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