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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:37 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Link between seasonal mean air temperature in Romania and large-scale air circulation
Authors:
Nicu BARBU (1, 2) and Sabina STEFAN (1)
Affiliation:
(1)University of Bucharest, Faculty of Physics, Atomistilor 405, P.O.BOX MG-11, Magurele, Bucharest, Romania.
(2)National Meteorological Administration, 97 Bucureºti-Ploieºti Str., Bucharest, Romania.
E-mail
nicubarbu1982@yahoo.com
Keywords:
circulation type clasifications, Romania, air temperature
Abstract:
In the context of global warming, the extreme events are expected to become more frequent, more persistent and more intense. The aim of this study is to investigate the link between seasonal mean 2 m air temperature in Romania and seasonal occurrence frequency of large-scale air circulation between 1979 and 2010. In order to achieve this, the GrossWetterTypen (GWT – Beck 2000) Catalogue developed within COST733Action (Philipp et al. 2014) was employed. Daily circulation types were used to calculate the seasonal frequencies of 18 GWT circulation types. The Pearson correlation coefficient was calculated between gridded 2 m air temperature time series extracted from ERA-Interim with a spatial resolution of 0.75 degree lat. by 0.75 degree lon. (Dee et al. 2011) and seasonal frequency of circulation types. The results show that the air temperature variations are captured for each season by different circulation types. In addition, the large-scale air circulation has different influences for different regions of the country due to local factors represented by the orography (Barbu et al. 2014).
References:
1.Barbu N, Georgescu F, Stefanescu VE, Stefan S. (2014) Large-scale mechanisms responsible to heat waves occurrence in Romania. Romanian Journal of Physics. 59(9-10):1109-1126.
2.Beck B. (2000) Zirkulationsdynamische Variabilitat im Bereich North-Atlantic-European seit 1780 (Variability of circulation dinamics in the North-Atlantic-European region). Wurzherger Geographische Arbeite 95 (in German).
3.Dee DP, Uppala SM, Simmons AJ, Berrisford P, Poli P, Kobayashi S, Andrae U, Balmaseda MA, Balsamo G, Bauer P, Bechtold P, Beljaars ACM, van de Berg L, Bidlot J, Bormann N, Delsol C, Dragani R, Fuentes M, Geer AJ, Haimberger L, Healy SB, Hersbach H, H́olm EV, Isaksen L, Kallberg P, Kohler M, Matricardi M, McNally AP, Monge-Sanz BM, Morcrette J-J, Park B-K, Peubey C, de Rosnay P, Tavolato C, Thepaut J-N, Vitart F. 2011. The ERA-Interim reanalysis: configuration and performance of the data assimilation system. Q. J. R. Meteorol. Soc. 137: 553 – 597. DOI:10.1002/qj.828
4.Philipp A, Beck C, Huth R, Jacobeit J. (2014) Development and comparison of circulation type classification using the COST733 dataset and software. Int. J. Climatol. doi:10.1002/joc.3920.
Acknowledgement:
Author N. Barbu work was supported by the strategic grant POSDRU/159/1.5/9.137750, “Project Doctoral and Postdoctoral programs support for increased competitiveness in Exact Sciences research” co-financed by the European Social Founds within the Sectoral Operational Program Human Resources Development 2007 – 2013.
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