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Atmospheric circulations associated to the interannual variability of cumulonimbus cloud frequency in the southern part of Romania

✍ Scribed by M. Paraschivescu; N. Rambu; S. Stefan

Publisher: John Wiley and Sons
Year: 2011
Tongue: English
Weight: 515 KB
Volume: 32
Category: Article
ISSN: 0899-8418
DOI: 10.1002/joc.2316

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✦ Synopsis

Abstract

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

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Reply to comments by S. B. Feldstein and

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## Abstract The note by Feldstein and Robinson (hereafter referred to as FR) raises two questions. The first is whether the EOF1 of zonal wind in the numerical integrations that we carried out is correlated with the atmospheric angular velocity or with the mean angular momentum. The second is wheth