Central European Blocking Anticyclones and the Influences Imprint over the Romania’s Climate

Open access

Abstract

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.

Austin, J. (1980). The blocking of middle latitude westerly winds by planetary waves. Quarterly Journal of the Royal Meteorological Society, 327-350.

Barry, R., & Chorley, R. (2003). Atmosphere, Weather and Climate (8th Ed.). New York: Routledge Taylor & Francis Group.

Benzi, S. W.-N. (1986). Anomalous Atmospheric Flows and Blocking (Vol. 29). Florida, USA: Academic Press.

Bluestein,, H. (1993). Synoptic-Dynamic Meteorology in Midlatitudes. Observations and Theory of Weather Systems (Vol. 2). New York, USA: Oxford University Press.

Haylock, M., Hofstra, N., Klok, J., Klein Tank, A., Jones, P., & New, M. (2008). A European daily high-resolution gridded data set of surface temperature and precipitation for 1950-2006. Journal of Geophysical Research, 113-119.

Kysely, J. (2007). Implications of enhanced persistence of atmospheric circulation for the occurrence and severity of temperature extremes. International Journal of Climatology, 689–695.

Mokhov, I., Timazhev, A., & Lupo, A. (2014). Changes in atmospheric blocking characteristics within Euro-Atlantic region and Northern Hemisphere as a whole in the 21st century from model simulations using RCP anthropogenic scenarios. Global and Planetary Change 122, 265-270.

Oliver, J. (2005). Encyclopedia of World Climatology. Cornwall: Springer.

Rex, D. (1950). Blocking action in the middle troposphere and its effect on regional climate. The climatology of blocking actions. Tellus 2, 275-301.

Rimkus, E., Kazys, J., Valiukas, D., & Stanunavicius, G. (2015). The atmospheric circulation patterns during dry periods in Lithuania. OCEANOLOGIA, 56 (2),, 223–239.

Tyrlis, E., & Hoskins, B. (2007). Aspects of a Northern Hemisphere Atmospheric Blocking Climatology. Journal of the atmospheric sciences, vol.65, 1638-1652.

Werner, P., & Gerstengarbe, F. (2010). PIK Report - Katalog der Grosswetterlagen Europas (1881-2009). Potsdam, Germania: Potsdam Institute for Climate Impact Research.

Journal Information

Metrics

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 167 167 14
PDF Downloads 78 78 8