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Northern Hemisphere circulation

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  • Nathan P. Gillett

    (Climatic Research Unit, School of Environmental Sciences, University of East Anglia)

Abstract

Air pressure at sea level during winter has decreased over the Arctic and increased in the Northern Hemisphere subtropics in recent decades, a change that has been associated with 50% of the Eurasian winter warming observed over the past 30 years, with 60% of the rainfall increase in Scotland and with 60% of the rainfall decrease in Spain1. This trend is inconsistent with the simulated response to greenhouse-gas and sulphate-aerosol changes2,3, but it has been proposed that other climate influences — such as ozone depletion — could account for the discrepancy3. Here I compare observed Northern Hemisphere sea-level pressure trends with those simulated in response to all the major human and natural climate influences in nine state-of-the-art coupled climate models over the past 50 years. I find that these models all underestimate the circulation trend. This inconsistency suggests that we cannot yet simulate changes in this important property of the climate system or accurately predict regional climate changes.

Suggested Citation

  • Nathan P. Gillett, 2005. "Northern Hemisphere circulation," Nature, Nature, vol. 437(7058), pages 496-496, September.
    • Handle: RePEc:nat:nature:v:437:y:2005:i:7058:d:10.1038_437496a
    DOI: 10.1038/437496a
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    Cited by:

    1. Patrick J. Michaels, 2008. "Evidence for “Publication Bias†concerning Global Warming in Science and Nature," Energy & Environment, , vol. 19(2), pages 287-301, March.

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