Cloud cover analysis associated to cut-off low-pressure systems over Europe using Meteosat Imagery



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Delgado, G. and Redaño, A. and Lorente, J. and Nieto, R. and Gimeno, L. and Ribera, P. and Barriopedro Cepero, David and García Herrera, Ricardo and Serrano, A. (2007) Cloud cover analysis associated to cut-off low-pressure systems over Europe using Meteosat Imagery. Meteorology and atmospheric physics, 96 (01-feb). pp. 141-157. ISSN 0177-7971

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This paper reports a cloud cover analysis of cut-off low pressure systems (COL) using a pattern recognition method applied to IR and VIS bispectral histograms. 35 COL occurrences were studied over five years (1994-1998). Five cloud types were identified in COLs, of which high clouds (HCC) and deep convective clouds (DCC) were found to be the most relevant to characterize COL systems, though not the most numerous. Cloud cover in a COL is highly dependent on its stage of development, but a higher percentage of cloud cover is always present in the frontal zone, attributable due to higher amounts of high and deep convective clouds. These general characteristics are most marked during the first stage (when the amplitude of the geopotencial wave increases) and second stage (characterized by the development of a cold upper level low), closed cyclonic circulation minimizing differences between rearward and frontal zones during the third stage. The probability of heavy rains during this stage decreases considerably. The centres of mass of high and deep convective clouds move towards the COL-axis centre during COL evolution.

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© Springer-Verlag 2006. This work was supported by the Spanish Ministry of Science and Technology (MCYT), under grant REN2002-04558-C04-04.

Uncontrolled Keywords:Stratosphere-troposphere exchange; Automatic classification; Northern-hemisphere; Satellite Imagery; Parameters; Tracking
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
Sciences > Physics > Atmospheric physics
ID Code:24690
Deposited On:18 Mar 2014 10:15
Last Modified:10 Dec 2018 15:05

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