Résumé. Nous présentons une étude pour la prédiction des trajectoires de cyclones dans l’océan Atlantique Nord à partir de données issues d’images satellites. On y extrait des mesures de vitesses de vent, de vorticité, d’humidité (base JRA-25) et des mesures de latitude, de longitude et de vitesse de vent instantanée des cyclones toutes les 6 heures (base IBTrACS). Les modèles de référence à ce...

Central to tropical cyclogenesis is the changing behavior of moist convection as the cyclone evolves. Based on a cumulus ensemble model run in weak temperature gradient mode, we suggest that the mid-level vortex created by early-stage convection stabilizes the environment in way that favors further development. In particular, modeled convection occurring in the more stable environment produces ...

Daily flow records, rainfall data and tropical cyclone maps during 19701998 are used to document the impact of tropical cyclones (TCs) on floods in the Rewa River system, Viti Levu, Fiji. Floods are large, brief, isolated events caused by TCs and non-TC tropical rainstorms. More floods are caused by tropical rainstorms than by TCs, but TC floods are larger. The log Pearson Type III distribution...

Cold nutrient-rich water from below the shallow seasonal thermocline is sometimes injected into the surface layer when a storm passes in a warm season. Decrease in sea surface temperature (SST) and increase in chlorophyll-a concentration (Chl-a) in a short period due to storm passages have been clearly captured by satellite observations [1]. Understanding the short-term Chl-a increase phenomena...

Introduction: Atmospheric dust plays an important role in regulating the climate of Mars and strongly influences the deposition of incoming solar energy and outgoing infrared radiation, thereby affecting atmospheric dynamics through heating. The lifting of dust from the surface is fundamentally a result of atmospheric circulations, and this provides an opportuntity for feedback between atmosphe...

In this work we consider a helical flow organization on small and large space scales in a forming tropical cyclone and offer a quantitative analysis for early stages in evolution of large-scale helical vortex based on diagnosis of a set of integral helical and energetic characteristics. Using the data from a near cloud-resolving numerical simulation by Regional Atmospheric Modeling System (RAMS...

A numerical experiment for the study of the development and the structure of tropical cyclones is performed with a 13-layer model. The total amount of latent heat released in a vertical column of air is specified by the horizontal mass convergence in the friction layer, as proposed by Ooyama (1964) . The vertical distribution of released latent heat is assumed to be proportional to the temperat...

Using Moderate Resolution Imaging Spectroradiometer and an extratropical cyclone database, the climatological distribution of aerosol optical depth (AOD) in extratropical cyclones is explored based solely on observations. Cyclone-centered composites of aerosol optical depth are constructed for the Northern Hemisphere midlatitude ocean regions, and their seasonal variations are examined. These c...