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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:03 |
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Conference: Bucharest University Faculty of Physics 2012 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Evolution trends of dry periods in
southwestern romania from observational data
Authors:
Cristina BURADA (1,2), Sabina STEFAN (1)
Affiliation:
(1) University of Bucharest, Faculty of Physics, Dept. of Atmospheric Physics, P.O.Box. Mg-11 Magurele, Bucharest, Romania,
(2) Senior Forecaster, National Meteorological Administration, Craiova, Romania
E-mail
burada_cristina@yahoo.com
Keywords:
drought, south-western Romania, WASP, trends
Abstract:
The aim of this paper is to determine the potential impact of climate changes in southwestern Romania in the last fifty years. In order to achieve this objective we analised precipitation amounts using Weighted Anomaly Standardized Precipitation index, which is a method reccomended by WMO (World Meteorological Organization)both for the significant results obtained and for the ease of calculation. Then we found the drought periods and the areas affected by dryness (and/or aridity, if case, using also Angot Index) and then we calculated and we analysed the annual, semestrial and seasonal frequencies of these periods and their tendencies of evolution. At the annual time step we observed a slow increase for the whole inteval 1961-2010, more intense between 1961-1990 and 1971-2000, and a decrease between 1981 and 2010. In the cold semester there is the same trend like for the annual step time. For the warm semester, we observed a decrease between 1961 and 2010 and also between 1981 and 2010 (but one order of higher magnitude) and an increase for the 1961-1990 and 1971-2000 intervals. At the seasonal time step we found an increase during the winter and the spring and a decrease during summer and autumn between 1961 and 2010, an increase for all seasons between 1961 and 1990 and 1971 and 2000, a decrease for all seasons between 1981 and 2010. We found the higher growth rate of dry months in spring between 1971 and 2000 and the largest decrease of them in autumn between 1981 and 2010.
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