Altered hydrologic feedback in a warming climate introduces a ``warming hole''

Details Altered hydrologic feedback in a warming climate introduces a ``warming hole'' Altered hydrologic feedback in a warming climate introduces a ``warming hole''

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3117109p&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 17, CiteID L17109

Physics

18

Global Change: Climate Dynamics (3309), Global Change: Instruments And Techniques, Meteorology And Atmospheric Dynamics: Boundary Layer Processes, Meteorology And Atmospheric Dynamics: Lightning, Meteorology And Atmospheric Dynamics: Land/Atmosphere Interactions

Scientific paper

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.

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