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Article
Altered hydrologic feedback in a warming climate introduces a “warming hole”
Geophysical Research Letters
  • Zaitao Pan, St. Louis University
  • Raymond W. Arritt, Iowa State University
  • Eugene S. Takle, Iowa State University
  • William J. Gutowski, Jr., Iowa State University
  • Christopher J. Anderson, Iowa State University
  • Moti Segal, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
9-1-2004
DOI
10.1029/2004GL020528
Abstract
In the last 25 years of the 20th century most major land regions experienced a summer warming trend, but the central U.S. cooled by 0.2–0.8 K. In contrast most climate projections using GCMs show warming for all continental interiors including North America. We examined this discrepancy by using a regional climate model and found a circulation-precipitation coupling under enhanced greenhouse gas concentrations that occurs on scales too small for current GCMs to resolve well. Results show a local minimum of warming in the central U.S. (a “warming hole”) associated with changes in low-level circulations that lead to replenishment of seasonally depleted soil moisture, thereby increasing late-summer evapotranspiration and suppressing daytime maximum temperatures. These regional-scale feedback processes may partly explain the observed late 20th century temperature trend in the central U.S. and potentially could reduce the magnitude of future greenhouse warming in the region.
Comments

This article is from Geophysical Research Letters 31 (2004): L17109, doi:10.1029/2004GL020528. Posted with permission.

Copyright Owner
American Geophysical Union
Language
en
File Format
application/pdf
Citation Information
Zaitao Pan, Raymond W. Arritt, Eugene S. Takle, William J. Gutowski, et al.. "Altered hydrologic feedback in a warming climate introduces a “warming hole”" Geophysical Research Letters Vol. 31 Iss. 17 (2004) p. L17109
Available at: http://works.bepress.com/william-gutowski/35/