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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:54 |
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Conference: Bucharest University Faculty of Physics 2007 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
The blocking circulation over Romania in relationship to
North Atlantic Oscillation
Authors:
Iuliana Roman, Sabina Stefan
Affiliation:
University of Bucharest , Faculty of Physics, Dept. of Atmospheric Physics,
P.O.BOX MG-11, 077125, Bucharest , Romania
E-mail
sabina_stefan@yahoo.com
aurelian_iuliana@yahoo.com
Keywords:
Blocking circulation, 2000-2005, North Atlantic Oscillation
Abstract:
The westerly flow variability and blocking are very important for generation of regional weather anomalies. In this paper, blocking as a potential generator of extreme weather in Europe is investigated. The Molteni-Tibaldi blocking index is applied to analyze daily geopotential height at 500hPa from 2000 to 2005, using fields of the NCEP/NCAR reanalysis data. The analysis is performed separately for winter (DJF), spring (MAM), summer (JJA) and autumn (SON). The time series of blocking index reveal high seasonal variability and negatively correlation to the NAO index time series. The results show that blocking events appear mostly during weak NAO (North Atlantic Oscillation) periods and the regional blocking circulation is directed by the large scale circulation.
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