Influence of Wave State and Sea Spray on the Roughness Length: Feedback on Medicanes

摘要: Occasionally, storms that share many features with tropical cyclones, including the presence of a quasi-circular “eye” warm core and strong winds, are observed in Mediterranean. Generally, they known as Medicanes, or tropical-like cyclones (TLC). Due to intense wind forcings consequent development high waves, large number sea spray droplets—both from bubble bursting spume tearing processes—are likely be produced at surface. In order take into account this process, we implemented an additional Sea Spray Source Function (SSSF) WRF-Chem, model version 3.6.1, using GOCART (Goddard Chemistry Aerosol Radiation Transport) aerosol sectional module. Traditionally, air-sea momentum fluxes computed through classical Charnock relation does not consider wave-state effects on surface roughness explicitly. these forcing, more recent parameterization aerodynamic within WRF layer model, which may applicable both moderate conditions. The SSSF have been tested operative sequence based COAWST (Coupled Ocean Atmosphere Wave Sediment WRF-Chem. third-generation wave SWAN (Simulating Waves Nearshore), two-way coupled atmospheric framework, provided field parameters. Numerical simulations integrated WRF-Chem chemistry package, aim calculating generated by waves include its effect parametrization together state effect. A single case study is performed, considering Medicane affected south-eastern Italy 26 September 2006. Since one most deeply analysed literature, investigation can easily shed some light feedbacks between drag coefficients.