Suchergebnisse

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.

Abstract
Climate change over the territory of the Atlantic-European sector during the recent decades is studied with reference to changes in the largescale atmospheric circulation. The classification of synoptic patterns (from the class of most probably to the class of least probable fields) is given for winter and summer for the last three decades, starting from 1974-1983. The synoptic pattern of the most probable class of field sea-level pressure shows high pressure over Europe in 1974-2005, which from decade to decade occupies more and more territory in summer and winter. The high temporal stability of predominant synoptic patterns is responsible for long-lived events of extreme warm and dry weather in winter and in summer for heat waves and droughts. The synoptic patterns corresponding to such dangerous weather conditions as extreme cold, strong precipitation, glaze ice, strong winds, hail etc. are discussed as well.