Contributions of natural and anthropogenic forcing to changes in temperature extremes over the United States

Details Contributions of natural and anthropogenic forcing to changes in temperature extremes over the United States Contributions of natural and anthropogenic forcing to changes in temperature extremes over the United States

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3419709m&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 19, CiteID L19709

Physics

11

Global Change: Global Climate Models (3337, 4928), Global Change: Regional Climate Change, Global Change: Impacts Of Global Change (1225), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Geographic Location: North America

Scientific paper

Observations averaged over the U.S. for the second half of the 20th century have shown a decrease of frost days, an increase in growing season length, an increase in the number of warm nights, and an increase in heat wave intensity. For the first three, a nine member multi-model ensemble shows similar changes over the U.S. in 20th century experiments that combine anthropogenic and natural forcings, though the relative contributions of each are unclear. Here we show results from two global coupled climate models run with anthropogenic and natural forcings separately. Averaged over the continental U.S., they show that the observed changes in the four temperature extremes are accounted for with anthropogenic forcings, but not with natural forcings (even though there are some differences in the details of the forcings). This indicates that most of the changes in temperature extremes over the U.S. are likely due to human activity.

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