POAEMM

The project is to develop a feasibility model for predicting the spatial and temporal variation of aerosols optical properties in marine coastal environment. Taking into account the evolution of this environmental phenomenon created by the effect of wind on the sea surface is achieved by coupling the MEDEX model (LSEET) and the fine mesh model AROME developed by Meteo-France. MEDEX estimates the concentration of marine aerosol particle size depending on wind speed, relative humidity and "fetch". "Fetch" represents the distance the wind has spread over the sea. AROME provides spatial and temporal variation of the wind field in coastal environment The project is divided in three parts. The first step is to make the semi-automation of the marine aerosols measuring station on the Porquerolles Island . The modification of the LSEET's experimental station offers a remote capacity for size concentration measurements. The choice of the measurement period will be made according to environmental and weather conditions provided by AROME. This approach allows to improve the marine aerosol modeling in the second step of the project. Based on a large number of local measurements, semi-empirical formulations of MEDEX are revised in order to take better account of oceanographic and meteorologic conditions. The final step is the realization of the feasibility model, integrating MEDEX and AROME. From the spatial and temporal variation of different meteorological fields provided by AROME and aerosols granulometric spectrum from MEDEX, the horizontal distribution of marine aerosols optical properties is estimated. An experimental validation based on radiance measurements of a black body is conducted to demonstrate the need to take into account precisely the marine aerosols mapping in tools for predicting optoelectronic sensors performances.