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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:04 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Modes of seasonal wind speed variability in Romania
Authors:
Lenuta MARIN(1,2), A.DUMITRESCU(1), M. V. BIRSAN(1), M. DIMA(2), Aristita BUSUIOC(1)
Affiliation:
1)Meteo Romania (National Meteorological Administration), Department of Climatology. Bucharest, Romania.
2)University of Bucharest, Faculty of Physics. Bucharest, Romania
E-mail
marinlenuta00@yahoo.com
Keywords:
wind speed, empirical orthogonal function, correlation
Abstract:
In order to investigate the main characteristics of the spatial and temporal variability, empirical orthogonal function (EOFs) have been applied to seasonal wind speed over Romania. Data from 104 meteorological stations from Meteo Romania, fairly spreaded over the country (both spatially and with respect to elevation), extending over the 1961-2010 period, have been used. The time series represent good quality, homogenized data series series with continuous and records. The dominant mode for all seasons has a monopolar structure with the highest magnitude over the eastern and southwestern regions and the lowest over the intra-Carpathian area. Thise results indicates large-scale mechanisms controls the seasonal wind variability in Romania. PC1 exhibits a significant downward trend for all seasons, with the highest rate for winter (0.26 m/s per year) and the lowest for summer and autumn (0.16 m/s per year). In order to investigate the physical reasons for this behaviour, a correlation analysis between the principal components of SLP and wind speed has been accomplished. The correlation between the aforementioned variables was found negative for all seasons. Considering the (positive) sign of SLP EOF1 pattern found in previous studies, a SLP PC1 increase (significant for winter and spring) suggest an increase in the frequency of anticyclonic patterns over Romania, which leads to a decrease in seasonal wind speed.
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