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Does freshening trend indicate weakening thermohaline circulation?

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  • npat1@juno.com
    GEOPHYSICAL RESEARCH LETTERS, VOL. 31, L02301,doi:10.1029/2003GL018584, 2004 Does the recent freshening trend in the North Atlantic indicate a weakening
    Message 1 of 1 , Feb 5, 2004
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      GEOPHYSICAL RESEARCH LETTERS, VOL. 31,
      L02301,doi:10.1029/2003GL018584, 2004

      Does the recent freshening trend in the North Atlantic indicate a
      weakening thermohaline circulation?

      Peili Wu, Richard Wood, and Peter Stott
      Met Office, Hadley Centre for Climate Prediction and Research,
      United Kingdom

      Abstract
      [1] It is widely expected that the thermohaline circulation of the
      ocean will slow down as greenhouse gas concentration in the atmosphere
      increases. This is partly due to an intensified hydrological cycle in a
      warmer climate. Is the recent observed freshening trend in the North
      Atlantic an indication of what has been expected? We report a similar
      freshening trend reproduced in an ensemble of four coupled model
      simulations with all major historical external (natural and
      anthropogenic) forcings. The modelled freshening trend originates from
      the Arctic Ocean where sea ice decrease and river runoffs increase with
      the same trend. Instead of weakening, we find an upward trend in the
      North Atlantic meridional overturning circulation.

      Forward from ClimateChangeDebate - Ben P

      Pat

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