Friday, 31 August 2007
5.PS-131
Interdecadal change of troposperic circulation in Southern Hemisphere extratropics during the recent warming episode at the Antarctic Peninsula region
Vazira F. Martazinova and Vladislav E. Tymofeyev. Climate Research and Long-Range Weather Forecasts, Ukrainian research Hydrometeorological Institute, Prospekt Nauki, 37, Kiev, Ukraine
Main features of atmospheric circulation are specified in austral extratropics with main purpose to explain reasons of recent intensive near-surface warming at the Antarctic Peninsula (AP) region. Results were compared with conclusions obtained early for the North Atlantic-European sector. Average mean sea level pressure fields as well as so-called etalon weather patterns have been analyzed. Typical positions of main barometric formations were specified for 1990s, close to Antarctic Peninsula. Area of cyclogenesis has widened at western Antarctic sector along with eastward shift of wedge close to AP. Present-day circulation at this region can be described as more stable and predictable than in mid-XX century maintaining warmer conditions in the region.