Increasing prevalence of extreme summer temperatures in the U.S.
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Human-caused climate change can affect weather and climate extremes, as well as mean climate properties. Analysis of observations and climate model results shows that previously rare (5th percentile) summertime average temperatures are presently occurring with greatly increased frequency in some regions of the 48 contiguous United States. Broad agreement between observations and a mean of results based upon 16 global climate models suggests that this result is more consistent with the consequences of increasing greenhouse gas concentrations than with the effects of natural climate variability. This conclusion is further supported by a statistical analysis based on resampling of observations and model output. The same climate models project that the prevalence of previously extreme summer temperatures will continue to increase, occurring in well over 50% of summers by mid-century.
- Increasing prevalence of extreme summer temperatures in the U.S.
Volume 111, Issue 2 , pp 487-495
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- 1. Lawrence Livermore National Laboratory, L-103, P. O. Box 808, Livermore, CA, 94550, USA
- 2. Climate Central, Inc., 895 Emerson St., Palo Alto, CA, 94301, USA
- 3. National for Atmospheric Research, P. O. Box 3000, Boulder, CO, 80305, USA