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Titre du document / Document title

Synergetic satellite study of a rapidly deepening cyclone over the Norwegian Sea : 13-16 February 1989

Auteur(s) / Author(s)

CLAUD C. (1) ; KATSAROS K. B. (2) ; MOGNARD N. M. (3) ; SCOTT N. A. (1) ;

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

(1) Laboratoire de Meteorologie Dynamique du CNRS, Ecole Polytechnique, Palaiseau, FRANCE
(2) Department of Atmospheric Sciences, University of Washington, Seattle, ETATS-UNIS
(3) Centre National d'Etudes Spatiales, GRGS, Toulouse, FRANCE

Résumé / Abstract

In oceanic regions, conventional meteorological observations are often insufficient for following the progression of atmospheric depressions, which generally leads to poor prediction in terms of strength and location. Since observations from polar-orbiting satellites probe nearly every region of the earth about twice a day, they can be used to track the propagation and evolution of weather systems and potentially improve the forecasts. The synoptic and mesoscale aspects ofa rapidly intensifying cyclone, which persisted over the northern Atlantic Ocean and the Norwegian Sea for four days in February 1989, are presented. A combination of three instruments was used: the TIROS-N Operational Vertical Sounder (TOVS; 19 infrared, 1 visible and 4 microwave channels), the Special Sensor Microwave/Imager(SSM/I, a passive microwave radiometer with 7 channels), and an active radar altimeter (Geosat). Atmospheric temperature and humidity profiles along with cloud information can be derived from the TOVS while SSM/I provides oceanic estimates of integrated water vapor content, integrated cloud liquid water content, rain occurrence, and surface wind speed; the Geosat radar altimeter measures marine surface wind speed and significant wave height. All sensors show the strong gradients in marine weather variables (surface wind speed, water vapor and cloud liquid water content) associated with the storm. The TOVS observations reveal that the disturbance occurred in a predominantly baroclinic environment. Furthermore, the lower stratospheric temperature fields derived from TOVS show that the rapid intensification took place when an upper-level trough with associated differential vorticity advection approached the surface low. The combination of TOVS and SSM/I provides a rough estimation of the air-sea fluxes, which are of the same order of magnitude as for rapidly intensifying storms found previously over other maritime areas. This case study confirms the value of using a combination of satellite instruments for studying weather systems in data-sparse maritime areas.

Revue / Journal Title

The Global atmosphere and ocean system    ISSN  1023-6732 

Source / Source

1995, vol. 3, no1, pp. 1-34 (1 p.3/4)

Langue / Language

Anglais

Editeur / Publisher

International Publishers Distributor, Newark, NJ, ETATS-UNIS  (1994-2003) (Revue)

Mots-clés anglais / English Keywords

Cyclogenesis

;

Cyclone depression

;

Satellite observation

;

Mesoscale

;

Synoptic scale

;

Image analysis

;

North Atlantic

;

Norwegian Sea

;

Atlantic Ocean

;

Arctic Ocean

;

Mots-clés français / French Keywords

Cyclogenèse

;

Dépression cyclonique

;

Observation par satellite

;

Mésoéchelle

;

Echelle synoptique

;

Analyse image

;

Océan Atlantique Nord

;

Mer de Norvège

;

Océan Atlantique

;

Océan Arctique

;

Mots-clés espagnols / Spanish Keywords

Ciclogénesis

;

Depresión ciclónica

;

Observación por satélite

;

Mesoescala

;

Escala sinóptica

;

Análisis imagen

;

Océano Atlántico Norte

;

Mar de Noruega

;

Océano Atlántico

;

Océano Ártico

;

Localisation / Location

INIST-CNRS, Cote INIST : 20684, 35400007351936.0010

Nº notice refdoc (ud4) : 1643721



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