Analysis of the precipitation and cloudiness associated with COLs occurrence in the Iberian Peninsula |
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Authors: | R Nieto L Gimeno J A Añel L De la Torre D Gallego D Barriopedro M Gallego A Gordillo A Redaño G Delgado |
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Institution: | (1) Facultad de Ciencias de Ourense, Universidad de Vigo, Ourense, Spain;(2) University of Lisbon, CGUL, IDL, Lisbon, Portugal;(3) Departamento de CC Ambientales, Universidad Pablo de Olavide de Sevilla, Sevilla, Spain;(4) Departamento de Física de la Tierra, Facultad de Físicas, Astronomía y Astrofísica, Universidad Complutense de Madrid, Ciudad Universitaria, Madrid, Spain;(5) Departamento de Física, Universidad de Extremadura, Badajoz, Spain;(6) Departamento de Astronomía y Meteorología, Universidad de Barcelona, Barcelona, Spain |
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Abstract: | Summary The Iberian Peninsula is one of the regions in the world with higher occurrence of cut-off low systems (COL). The aim of this
paper is to analyse the weather events (rainfall and cloudiness layer) associated to COLs in the Iberian Peninsula with tools
not previously used: (a) the use of the new multidecadal COLs database developed by Nieto et al (2005) that permit us to study
a 41 years period (1958–1998), (b) the checking of the expected weather events (rainfall and cloudiness layer) associated
with COLs in a conceptual model (Winkler et al, 2005) and (c) the extensive use of radiosoundings to analyse convective instability
in areas inside and close to the COL. Two points of view are used to make the analysis: (1) a source oriented method, when
a particular COL is followed and its associated precipitation and cloudiness is analysed over four quadrants in which Iberia
was divided and (2) a receptor oriented method, when the precipitation associated to COLs is analysed in given areas, defined
by patterns of precipitation. Results reveal that the precipitation and cloudiness patterns associated to COLs in the conceptual
model reproduce quite well the main characteristics found over the Iberian Peninsula. The generalized idea that most of the
COLs produce intense convective rainfall is show to be misleading. Convective phenomena are important usually when the centre
of the COL is located on the Mediterranean region. Most of the rainfall associated with COLs comes from the baroclinic shield;
specially in cases located over the west half of the Iberian Peninsula. It is shown that nearly 30% of COLs do not induce
any rainfall; most of them located in the southern half of the Peninsula, and mainly during autumn. Only 30% of COLs produce
generalized rainfall over the whole analysed territory, being most of them (about 90%) located over the western half of the
Iberian Peninsula. |
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