Remote sensing of particle matter using Sea WiFS

摘要

Over land, the Dense Dark Vegetation is used to derive in a first stage the aerosol path radiance and in a second stage to propose an aerosol product which consists of the aerosol optical thickness at 443 nm. Air quality monitoring of the particles is based on measurements of PM_(10) and PM_(2.5) which are respectively the density of particles of diameter lesser than 10μm, lesser than 2.5 μm, at the surface. The satellite aerosol product can be converted into PM_(10) and PM_(2.5), based on different assumptions: particle density and vertical distribution mainly. This first attempt to monitor PM from space can be validated with in-situ data. Another approach will simply consist in using the in-situ PM measurements to calibrate the satellite imagery. With the frame of a European project, we generated, over an area centered on Lille (50'36° N, 3'08 E, North of France), a data base with the SeaWiFS archive, and the PM data collected by the regional air quality network. The above technique will be applied and validate using this data base.