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Extended Hadley Circulation Produces Equable Climate1 DORIAN S. ABBOT, CHRIS C. WALKER, AND BRIAN F. FARRELL 3
 

Summary: Extended Hadley Circulation Produces Equable Climate1
in GCM2
DORIAN S. ABBOT, CHRIS C. WALKER, AND BRIAN F. FARRELL §3
Department of Geophysical Sciences, University of Chicago, Chicago, IL 606374
15 April 20105
Department of Geophysical Sciences, University of Chicago, Chicago, IL 60637
Corresponding author address: Dorian Abbot, Department of Geophsyical Sciences, 5734 South Ellis
Avenue Chicago, IL 60637. E-mail: abbot@uchicago.edu.
FAS-IT Research Computing, Harvard University, Cambridge, Massachusetts 02138
§Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138
Abstract6
The proxy climate record indicates that equable climates, which occurred during the Cretaceous,7
Paleocene, and Eocene (100 to 35 million years ago), were characterized by greatly reduced8
seasonality and pole to equator temperature contrast compared to modern values. It has proven9
difficult to simulate these climatic features, particularly in continental interiors, using global cli-10
mate models, which has prompted a search for alternative heat transport, high-latitude warming,11
or tropical cooling mechanisms. Among these alternative mechanisms is a global Hadley cir-12
culation, analogous to that responsible for the small meridional temperature gradient found on13
slowly-rotating planets such as Venus. The required extension of the symmetric circulation could14
result from an increase relative to present values in the rate at which zonal angular momentum is15

  

Source: Abbot, Dorian Schuyler - Department of Geophysical Sciences, University of Chicago

 

Collections: Geosciences