Marine and biomass burning aerosols in the southern Indian Ocean: Retrieval of aerosol optical properties from shipborne lidar and Sun photometer measurements

摘要: We document aerosol extinction properties in the southern Indian Ocean. A unique data set of shipborne measurements has been collected with a dual Rayleigh-Mie lidar aboard research vessel Marion Dufresne during two campaigns: one around Madagascar Southern Hemisphere late summer and close to Kerguelen Islands biomass burning (BB) season. During this latter, layer containing mix BB marine aerosols extending up ∼3 km above mean sea level (amsl) observed from [31°S, 69°E] [24°S, 59°E]. Both vertical structure optical have retrieved inversion signals. Sun photometer-derived thickness (AOT) at 355 nm is used constrain inversion. obtain integrated value backscatter-to-extinction ratio (BER) (extinction-to-backscatter ratio, or so-called LR) 0.039 ± 0.009 sr−1 (26 6 sr) 0.021 0.006 (48 12 for layer, mixing between an uncertainty (6 0.004 (9 sr), respectively. Lidar calibration inverse without any simultaneous photometer (as nighttime data), temporal evolution extension plume documented. The presence agreement Lagrangian model GIRAFE v3 (reGIonal ReAl time Fire plumEs) simulations, which show South American African origin encountered layer.