ON THE ROLE OF TROPOSPHERIC CIRCULATION IN RECENT CLIMATE CHANGES IN THE ANTARCTIC PENINSULA REGION

Vladislav E. Tymofeyev

DOI: http://dx.doi.org/10.2478/2292

Abstract


The state of tropospheric circulation in the West Antarctic sector  (WAS) is considered during 1990s, the warmest decade in the Antarctic  Peninsula (AP) region. Regional warming has progressed almost coherently  with the second phase of global warming and is related to oceanic variability,  specifically PDO-ENSO conditions. Atmospheric circulation in 1990s  comprises a prevailing cyclogenesis west of the Antarctic Peninsula sector  along with frequent weather modifications (the winter season in particular  is examined) and the ridge of high pressure to the east. Predominant atmospheric  circulation types for the recent decade are found to be stable in time  causing smaller air temperature oscillations on different time scales. The  circulation background responsible for the stabilization of air temperature  growth in the AP region immediately after the turn of the millennium is  shown.   


Keywords


regional warming; Antarctic Peninsula; predominant circulation type; criterion of similarity

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