Long-Term Aridity Changes in the Western United States

Author:

Cook Edward R.1234,Woodhouse Connie A.1234,Eakin C. Mark1234,Meko David M.1234,Stahle David W.1234

Affiliation:

1. Lamont-Doherty Earth Observatory, Palisades, NY 10964, USA.

2. National Oceanic and Atmospheric Administration (NOAA), National Climatic Data Center, Boulder, CO 80305, USA.

3. Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ 85721, USA.

4. Department of Geosciences, University of Arkansas, Fayetteville, AR 72701, USA.

Abstract

The western United States is experiencing a severe multiyear drought that is unprecedented in some hydroclimatic records. Using gridded drought reconstructions that cover most of the western United States over the past 1200 years, we show that this drought pales in comparison to an earlier period of elevated aridity and epic drought in AD 900 to 1300, an interval broadly consistent with the Medieval Warm Period. If elevated aridity in the western United States is a natural response to climate warming, then any trend toward warmer temperatures in the future could lead to a serious long-term increase in aridity over western North America.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference33 articles.

1. J. Lawrimore S. Stephens “Climate of 2002 annual review” (NOAA National Climatic Data Center available at http://lwf.ncdc.noaa.gov/oa/climate/research/2002/ann/events.html) 2003.

2. D. Miskus U.S. Drought Monitor (National Centers for Environmental Prediction/National Weather Service/NOAA Climate Prediction Center available at www.drought.unl.edu/dm/monitor.html) 2004.

3. Meteorological drought 1965

4. A Review of Twentieth-Century Drought Indices Used in the United States

5. Global variations in droughts and wet spells: 1900-1995

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