Cristin-resultat-ID: 1868167
Sist endret: 2. februar 2022, 15:01
NVI-rapporteringsår: 2021
Resultat
Vitenskapelig artikkel
2021

On the Influence of Sea Surface Temperature distributions on the Development of Extratropical Cyclones

Bidragsytere:
  • Hai Hoang Bui og
  • Thomas Spengler

Tidsskrift

Journal of the Atmospheric Sciences
ISSN 0022-4928
e-ISSN 1520-0469
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2021
Publisert online: 2021
Trykket: 2021
Volum: 78
Sider: 1173 - 1188

Importkilder

Scopus-ID: 2-s2.0-85105059057

Klassifisering

Vitenskapsdisipliner

Meteorologi

Beskrivelse Beskrivelse

Tittel

On the Influence of Sea Surface Temperature distributions on the Development of Extratropical Cyclones

Sammendrag

The sea surface temperature (SST) distribution can modulate the development of extratropical cyclones through sensible and latent heat fluxes. However, the direct and indirect effects of these surface fluxes, and thus the SST, are still not well understood. This study tackles this problem using idealized channel simulations of moist baroclinic development under the influence of surface fluxes. The model is initialized with a zonal wind field resembling the midlatitude jet and a different SST distribution for each experiment, where the absolute SST, the SST gradient, and the meridional position of the SST front are varied. The surface latent heat flux associated with the absolute SST plays a key role in enhancing the moist baroclinic development, while the sensible heat fluxes associated with the SST gradient play a minor role that can be detrimental for the development of the cyclone. The additional moisture provided by the latent heat fluxes originates from about 1000 km ahead of the cyclone a day prior to the time of the most rapid deepening. When the SST in this region is higher than 16°C, the additional latent heat is conducive for explosive cyclone development. For SSTs above 20°C, the cyclones feature characteristics of hybrid cyclones with latent heat release close to their core, maintaining their intensity for a longer period due to continuous and extensive moisture supply from the surface. A high absolute SST with a weak SST gradient, however, can lead to a delay of the deepening stage, because of unorganized convection at early stages reducing environmental baroclinicity.

Bidragsytere

Hoang Hai Bui

Bidragsyterens navn vises på dette resultatet som Hai Hoang Bui
  • Tilknyttet:
    Forfatter
    ved Geofysisk institutt ved Universitetet i Bergen

Thomas Spengler

  • Tilknyttet:
    Forfatter
    ved Geofysisk institutt ved Universitetet i Bergen
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