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Niţă Andrei and Apostol Liviu


Blocking anticyclonic circulations from Europe are provoking climatic episodes responsible for discomfort, human and financial loses. During the summer, these episodes are known for prolonged droughts and maximum temperatures often exceeding 35 °C to 40 °C. In the cold season, the rainfalls are close to 0 while the daily minimum temperatures are low under the average period. For this study, we used a synoptic classification which is available especially for Central Europe but works similarly for Romanian territory too. We aim to follow what kind of climatic conditions these circulations are producing in Romania during their presence in Europe. ECA&D daily gridded climatic dataset was used in this study. The study period lasts from 1961 to 2012. We used the minimum and maximum daily temperatures as well the rainfall quantities recorded. Since the output volume of data was too high, we aggregated the results into yearly multiseasonal average. In order to classify the synoptic patterns as blocking anticyclones, we used two synoptic situations from Hess-Brezowsky defined as Anticyclone High Central (HM) and High British Isles (HB). We calculated the thermic anomalies as well the rainfall quantities recorded in Romania during the presence of these circulations in central Europe. The results shows a perspective over the synoptic conditions in Romania during the presence of the above mentioned synoptic types in Central Europe.

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Silvia Kohnová, Ladislav Gaál, Tomáš Bacigál, Ján Szolgay, Kamila Hlavčová, Peter Valent, Juraj Parajka and Günter Blöschl

. C., Gerstengarbe F.-W., 2010: Catalogue of weather patterns in Europe (1881-2009): After Paul Hess and Helmut Brezowsky, improved and supplemented edition (Katalog der Grosswetterlagen Europas (1881-2009) nach Paul Hess und Helmut Brezowsky, 7., verbesserte und ergänzte Auflage). PIK-Report No. 119, Potsdam Institute for Climate Impact Research, Potsdam, 146 p. (in German). Zhang L., Singh V. P., 2006: Bivariate flood frequency analysis using the copula method. Journal of Hydrologic Engineering, 11, 150-164, doi: 10.1061/(asce)1084-0699(2 006

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Irimia Liviu Mihai, Patriche Cristian Valeriu, LeRoux Renan, Quénol Herve, Tissot Cyril and Sfîcă Lucian

). Sfîcă L., Niţă A., Iordache I., Ilie N. (2015), Specific weather conditions on Romanian territory for Hess-Brezowsky westerly circulation type . 15th International Multidisciplinary Scientific Geo Conference SGEM 2015, Conference Proceedings, 4:1073-1080. Sfîcă L., Ichim P., Patriche C.V., Irimia L.M., Oană L. (2014), Cotnari vineyard - a gift of hydraulic foehn , Lucrări Științifice, Seria Agronomie, 1(57), 227-233. Stock M., Gerstengarbe F.W., Werner P.C. (2005) Reliability of climate change impact assessments for viticulture . Acta Horticulturae

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Ján Szolgay, Ladislav Gaál, Tomáš Bacigál, Silvia Kohnová, Kamila Hlavčová, Roman Výleta, Juraj Parajka and Günter Blöschl

of copula types for peak-volume flood relationships. Proc. IAHS, 370, 183–188. doi: 10.5194/piahs-370-183-2015. Vernieuwe, H., Vandenberghe, S., De Baets, B., Verhoest, N.E.C., 2015. A continuous rainfall model based on vine copulas. Hydrology and Earth System Sciences, 19, 6, 2685–2699. doi:10.5194/hess-19-2685-2015. Werner, P.C., Gerstengarbe, F.-W., 2010. Katalog der Grosswetterlagen Europas (1881–2009) nach Paul Hess und Helmut Brezowsky, 7., verbesserte und ergänzte Auflage. [Catalog of Large Weather Conditions of Europe (1881-2009), after Paul

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Zbigniew Ustrnul, Agnieszka Wypych, Julie A. Winkler and Danuta Czekierda

circulation classifications. Physics and Chemistry of the Earth 35: 429-436. DOI 10.1016/j.pce.2009.12.012. Werner P.C., Gerstengarbe F-W., 2010. Katalog der Großwetterlagen Europas (1881-2009) nach Paul Hess und Helmut Brezowsky, 7. verbesserte und ergänzte Auflage. PIK Report No. 119. Wibig J., 2001. The influence of atmospheric circulation on spatial distribution of air temperature and precipitation anomalies over Europe. Wyd. Uniwersytetu Łódzkiego, Łódź. Winkler J.A., Thornsbury S, Artavio M., Chmielewski F.M., Kirschke D

Open access

Artur Widawski

heat island circulation as a regulating factor on the nocturnal urban heat island, Int. J. of Climatol ., 19: 975-988. Hess P. and Brezowsky H. 1952. Katalog der Grosswetterlagen Europas. Ber. Dl. Wetterdienst in US-Zone, 33: 39. Hławiczka S., Dyduch B., Fudała J. 2003. Long-term changes of particulate emission in the industrial region of Upper Silesia (Poland) and their effect on the acidity of rainwater. Water, Air Soil Poll. , 142: 151-163. Kłysik K., Fortuniak K. 1999. Temporal and spatial characteristics of the urban heat island of Łódź

Open access

Kinga Kulesza

to 40 ( Schüepp 1979 ) or even 80 different predefined types (as in the classification developed by the Central Institute of Meteorology in Vienna). Most of the classifications used in Europe have between 9 and 40 types, while the most popular ones are those with 9, 18, or 27 types ( Philipp et al. 2010 ). According to Philipp et al. (2010) , circulation type classification schemes can be divided into two main groups: subjective and automated. Subjective classifications include the very well-known Grosswetterlagen classification ( Hess & Brezowsky 1952