A simplified model for the baroclinic and barotropic ocean response to moving tropical cyclones: 2. Model and Simulations

Type Article
Date 2019-05
Language English
Author(s) Kudryavtsev Vladimir1, 2, Monzikova Anna1, Combot Clement3, Chapron BertrandORCID1, 3, Reul NicolasORCID3
Affiliation(s) 1 : Satellite Oceanography Laboratory, Russian State Hydrometeorological University Saint‐Petersburg, Russia
2 : Remote Sensing Department, Marine Hydrophysical Institute Sebastopol, Russia
3 : Laboratoire d’Oceanographie Physique et Spatiale, Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Plouzané ,France
Source Journal Of Geophysical Research-oceans (2169-9275) (American Geophysical Union (AGU)), 2019-05 , Vol. 124 , N. 5 , P. 3462-3485
DOI 10.1029/2018JC014747
WOS© Times Cited 9
Keyword(s) tropical cyclones, simplified mode of ocean response, simulation of satellite observations

A simplified analytical model is developed to describe the baroclinic and barotropic ocean response to moving Tropical cyclones (TC) and their associated pycnocline erosions. The model builds on classical mixed layer (ML) models and linear models of ocean response to transient events. As suggested, disturbances of the upper ocean stratification caused by the ML development shall not strongly impact the dynamics of baroclinic modes. Accordingly, the baroclinic response can be estimated using the pre‐storm ocean stratification condition. To the contrary, the ML is strongly coupled with these interior motions, through the TC‐induced upwelling response which affects the entrainment velocity. The ML temperature is then strongly dependent on the local temperature gradient in the upper layer. The model is represented by a set of analytical relationships providing rapid calculations for the ocean response to TC, given a prescribed wind velocity field traveling over an ocean with arbitrary stratification. Compared to satellite observations, simulations demonstrate the model ability to quantitatively reproduce the observed shape and magnitudes of the sea surface height (SSH) and the surface temperature (SST) anomalies. Remarkably, the model is robust and efficient for a wide range of variability of TC characteristics (max wind speed, radius, shape of wind profile, translation velocity), parameters of the ocean stratification, and Coriolis parameter. Simulations provide solid evidences about the key role of TC‐induced upwelling in the ML cooling and formation of SST wake. Cross‐track advection by wind driven currents, though small compared with TC translation velocity, can significantly contribute to broaden the shape and offset of the SST wake. Given its effectiveness and low computational burden, the proposed model can be introduced as a computational module into atmospheric numerical models of TC coupled‐evolution with the ocean, through the resulting local changes of surface enthalpy fluxes.

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Kudryavtsev Vladimir, Monzikova Anna, Combot Clement, Chapron Bertrand, Reul Nicolas (2019). A simplified model for the baroclinic and barotropic ocean response to moving tropical cyclones: 2. Model and Simulations. Journal Of Geophysical Research-oceans, 124(5), 3462-3485. Publisher's official version : https://doi.org/10.1029/2018JC014747 , Open Access version : https://archimer.ifremer.fr/doc/00491/60251/