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Science 6 April 2001:
Vol. 292. no. 5514, pp. 90 - 92
DOI: 10.1126/science.1058582

Reports

Tropical Origins for Recent North Atlantic Climate Change

Martin P. Hoerling,1 James W. Hurrell,2 Taiyi Xu1

Evidence is presented that North Atlantic climate change since 1950 is linked to a progressive warming of tropical sea surface temperatures, especially over the Indian and Pacific Oceans. The ocean changes alter the pattern and magnitude of tropical rainfall and atmospheric heating, the atmospheric response to which includes the spatial structure of the North Atlantic Oscillation (NAO). The slow, tropical ocean warming has thus forced a commensurate trend toward one extreme phase of the NAO during the past half-century.

1 Climate Diagnostics Center, National Oceanic and Atmospheric Administration-Environmental Research Laboratories, Boulder, CO 80303, USA.
2 National Center for Atmospheric Research, Post Office Box 3000, Boulder, CO 80307, USA.
To whom correspondence should be addressed. E-mail: mph{at}cdc.noaa.gov


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Science. ISSN 0036-8075 (print), 1095-9203 (online)