DURHAM, N.C. -- High-pressure systems over oceans, which largely determine the tracks of tropical cyclones and hydrological extremes in much of the northern hemisphere, are likely to intensify this century, according to a Duke University-led study.
The study, published online this week in Nature Geoscience, suggests that as summertime near-surface high-pressure systems over the northern Pacific and Atlantic oceans strengthen, they could play an increasingly important role in shaping regional climate, particularly the occurrence of drought and extreme summer rainfall in coming years.
Wenhong Li, assistant professor of earth and ocean sciences at Duke's Nicholas School of the Environment, and colleagues used climate model simulations to predict future changes in the strength of the annually occurring North Atlantic Subtropical High, also known as the Bermuda High, and the North Pacific Subtropical High.
According to the simulations, these high-pressure systems will intensify over the 21st century as a result of increasing greenhouse-gas concentrations. The simulations suggest that an increase in the land-sea thermal contrast -- the difference between ocean and land heating as Earth's climate warms -- will fuel the systems' intensification.
The researchers used climate model simulations from the Intergovernmental Panel on Climate Change Fourth Assessment Report and 40 years of atmospheric circulation data from the European Centre for Medium-Range Weather Forecasts for the months of June, July and August to conduct their research.
Li's co-authors on the new study were Laifang Li, a Ph.D. student at the Nicholas School; Mingfang Ting of the Lamont-Doherty Earth Observatory at Columbia University's Earth Institute; and Yimin Liu of the Chinese Academy of Sciences' Institute of Atmospheric Physics.
The full study is online at http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo1590.html.
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