Simulated reduction in Atlantic hurricane frequency under twenty-first-century warming conditions

Thomas R. Knutson, Joseph J. Sirutis, Stephen T. Garner, Gabriel Andres Vecchi, Isaac M. Held

Research output: Contribution to journalArticle

267 Scopus citations

Abstract

Increasing sea surface temperatures in the tropical Atlantic Ocean and measures of Atlantic hurricane activity have been reported to be strongly correlated since at least 1950 (refs 1, 2, 3, 4, 5), raising concerns that future greenhouse-gas-induced warming could lead to pronounced increases in hurricane activity. Models that explicitly simulate hurricanes are needed to study the influence of warming ocean temperatures on Atlantic hurricane activity, complementing empirical approaches. Our regional climate model of the Atlantic basin reproduces the observed rise in hurricane counts between 1980 and 2006, along with much of the interannual variability, when forced with observed sea surface temperatures and atmospheric conditions. Here we assess, in our model system, the changes in large-scale climate that are projected to occur by the end of the twenty-first century by an ensemble of global climate models, and find that Atlantic hurricane and tropical storm frequencies are reduced. At the same time, near-storm rainfall rates increase substantially. Our results do not support the notion of large increasing trends in either tropical storm or hurricane frequency driven by increases in atmospheric greenhouse-gas concentrations.

Original languageEnglish (US)
Pages (from-to)359-364
Number of pages6
JournalNature Geoscience
Volume1
Issue number6
DOIs
StatePublished - Jun 2008

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

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