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Atmospheric circulations associated to the interannual variability of cumulonimbus cloud frequency in the southern part of Romania
Author(s) -
Paraschivescu M.,
Rambu N.,
Stefan S.
Publication year - 2012
Publication title -
international journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0899-8418
DOI - 10.1002/joc.2316
Subject(s) - climatology , advection , atmospheric circulation , environmental science , thunder , atmospheric sciences , meteorology , geography , geology , physics , thermodynamics
Especially in summer time, Romania is affected by deep convections associated with severe weather phenomena (hail, wind gusts, flash floods, frequent thunder). The interannual variability of the Cb (cumulonimbus) cloud frequency recorded at 20 weather stations from the southern part of Romania in the 1961–2007 interval was investigated in connection with the atmospheric circulation variability. Using the Canonical Correlation Analysis (CCA) three types of atmospheric circulations have been identified that control about 60% of the interannual variability of the Cb cloud frequency. The three types of identified circulations facilitate warm and moist air advection from the Mediterranean, and cold air advection from northern Europe towards the south of Romania, creating conditions for Cb clouds to occur. Copyright © 2011 Royal Meteorological Society