Meroni A. N., Renault Lionel, Parodi A., Pasquero C. (2018). Role of the oceanic vertical thermal structure in the modulation of heavy precipitations over the Ligurian Sea. Pure and Applied Geophysics, 175 (11), p. 4111-4130. ISSN 0033-4553.
Titre du document
Role of the oceanic vertical thermal structure in the modulation of heavy precipitations over the Ligurian Sea
Meroni A. N., Renault Lionel, Parodi A., Pasquero C.
Pure and Applied Geophysics, 2018,
175 (11), p. 4111-4130 ISSN 0033-4553
The importance of the upper ocean thermal vertical structure (mixed-layer depth and stratification) in the control of the precipitation during a heavy-rain-producing mesoscale convective system is investigated by means of numerical simulations. In particular, the fully compressible, nonhydrostatic Euler equations for the atmosphere and the hydrostatic Boussinesq equations for the ocean are numerically integrated to study the effect of the ocean-atmosphere coupling both with realistic initial and boundary conditions and with simpler, analytical vertical temperature profile forcing. It is found that the action of the winds associated with the synoptic system, in which the heavy precipitation event is embedded, can entrain deep and cold water in the oceanic mixed layer, generating surface cooling. In the case of a shallow mixed layer and strongly stratified water column, this decrease in sea surface temperature can significantly reduce the air column instability and, thus, the total amount of precipitation produced.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche 
Sciences du milieu 
Limnologie physique / Océanographie physique