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Titre du document / Document title

Interaction of a cold front with a sea-breeze front numerical simulations

Auteur(s) / Author(s)

RHODIN A. ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

Max-Plank-Inst. Meteorologie, 20146 Hamburg, ALLEMAGNE

Résumé / Abstract

This paper presents simulations of a front which passed the coast between the North Sea and northern Germany and thereby experienced some modifications of its mesoscale characteristics. The event was observed during the field experiment FRONTEX'89. The two-dimensional non-hydrostatic simulations presented in this paper resemble some of the observed characteristics and yield a detailed desription of the evolution of the surface front. Over the sea several narrow frontal rain bands develop in the boundary layer which becomes unstable due to the increasing sea surface temperature near the coast. The rain bands move forward relative to the front due to the cross frontal circulation which is enhanced by the release of latent heat in the ascending warm air and by the cooding of the cold air below by evaporating precipitation. Over the heated land surface a sea-breeze front develops ahead of the synoptic-scale cold front. The strong frontal gradients of the sea-breeze front mask the broader frontal zone of the cold front at the ground. The sea-breeze front triggers deep convection ahead of the cold front in the afternoon and takes over all characteristics of the synoptic-scale front in the evening. The simulations show the mechanisms that caused the observed evolution and modification of the synoptic-scale cold front. They emphasize the strong influence of the surface heat fluxes on the characteristics of fronts on the mesoscale. The most important feature of the numerical model, necessary for the proper representation of the frontal characteristics on the mesoscale, is its high resolution. The simulations are restricted by the difficulties of finding an initial state and appropriate boundary conditions so that the results fit the observations for a long time period and that spin-up problems are avoided

Revue / Journal Title

Tellus. Series A, Dynamic meteorology and oceanography    ISSN  0280-6495   CODEN TSAOD8 

Source / Source

1995, vol. 47, no4, pp. 403-420 (20 ref.)

Langue / Language

Anglais

Editeur / Publisher

Blackwell, Oxford, ROYAUME-UNI  (1983) (Revue)

Mots-clés anglais / English Keywords

Atmospheric front

;

Cold front

;

Sea breeze

;

Mesoscale

;

Numerical simulation

;

Two dimensional model

;

Coastal zone

;

Germany

;

North Sea

;

Europe

;

Mots-clés français / French Keywords

Front atmosphérique

;

Front froid

;

Brise mer

;

Mésoéchelle

;

Simulation numérique

;

Modèle 2 dimensions

;

Zone côtière

;

Allemagne

;

Mer du Nord

;

Europe

;

Mots-clés espagnols / Spanish Keywords

Frente atmosférico

;

Frente frío

;

Brisa marina

;

Mesoescala

;

Simulación numérica

;

Modelo 2 dimensiones

;

Zona costera

;

Alemania

;

Mar del Norte

;

Europa

;

Localisation / Location

INIST-CNRS, Cote INIST : 2121 A, 35400005154381.0020

Nº notice refdoc (ud4) : 3570629



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