DBPapers
DOI: 10.5593/SGEM2015/B41/S19.138

SPECIFIC WEATHER CONDITIONS ON ROMANIAN TERRITORY FOR HESS – BREZOWSKY WESTERLY CIRCULATION TYPES

L. Sfica, A.Nita, I. Iordache, N. Ilie
Monday 28 September 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-38-4 / ISSN 1314-2704, June 18-24, 2015, Book4, 1073-1080 pp

ABSTRACT
We aim to (re)evaluate the role of oceanic influences on the climate of Romanian territory. Generally, these influences are transmitted through the western atmospheric circulations types which are known to have a major significance on Romania’s climate. In brief, the westerly circulation types are responsible for warmer air mass advections during the winter season and colder air mass advections in the summer season. Also, they bring a considerable contribution for the amounts of atmospheric precipitation recorded especially in the winter season. Westerly circulation types were considered according to western-anticyclonic type (WA) and western-cyclonic type (WZ) as described in the Hess–Brezowsky catalogue of large-scale circulation patterns. Temperature and precipitation data were derived from ROCADA gridded data set which covers all the Romanian territory for the period between 1990 and 2012. Most of the results are showing a correlation between the north-western and north-eastern region of Romania as regions where westerly circulations patterns have the largest impact on climatic conditions. The statistical significant levels of the intensity and frequency of these circulation types in reference to the recent climate change trends within the region are also analysed.

Keywords: Hess – Brezowsky catalogue, westerly circulations, temperature deviations, air mass advections, Romania, precipitation amounts.