Recent radical shifts of atmospheric circulations and rapid changes in Arctic climate system
Xiangdong Zhang (International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, Alaska, USA), Asgeir Sorteberg (Bjerknes Centre for Climate Research, Bergen, Norway), Jing Zhang (Arctic Region Supercomputing Center, University of Alaska Fairbanks, Fairbanks, Alaska, USA), Rüdiger Gerdes (Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany), and Josefino C. Comiso (NASA Goddard Space Flight Center, Greenbelt, Maryland, USA)
Arctic climate system change has accelerated tremendously since the beginning of this century, and a strikingly extreme sea-ice loss occurred in summer 2007. However, the greenhouse-gas-emissions forcing has only increased gradually and the driving role in Arctic climate change of the positively-polarized Arctic/North Atlantic Oscillation (AO/NAO) trend has substantially weakened. Although various contributing factors have been examined, the fundamental physical process, which orchestrates these contributors to drive the acceleration and the latest extreme event, remains unknown. We report on drastic, systematic spatial changes in atmospheric circulations, showing a sudden jump from the conventional tri-polar AO/NAO to an unprecedented dipolar leading pattern, following accelerated northeastward shifts of the AO/NAO centers of action. These shifts provide an accelerating impetus for the recent rapid Arctic climate system changes, perhaps shedding light on recent arguments about a tipping point of global-warming-forced climate change in the Arctic. The radical spatial shift is a precursor to the observed extreme change event, demonstrating skilful information for future prediction.
(Received 6 August 2008; accepted 10 October 2008; published 18 November 2008.)
Citation: (2008), Recent radical shifts of atmospheric circulations and rapid changes in Arctic climate system, Geophys. Res. Lett., 35, L22701, doi:10.1029/2008GL035607.
Link to abstract: http://www.agu.org/pubs/crossref/2008/2008GL035607.shtml
No comments:
Post a Comment