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Spaceborne reflectance measurements from the POLDER instrument are used tostudy the specific directional signature close to the backscatter direction.The data analysis makes it possible to derive the extinction-to-backscatterratio (EBR), which is related to the inverse of the scattering phase functionfor an angle of 180° and is needed for a quantitativeinterpretation of lidar observations (active measurements). In addition, themultidirectional measurements are used to quantify the scattering phasefunction variations close to backscatter, which also provide some indicationof the aerosol particle size and shape. The spatial distributions of bothparameters show consistent patterns that are consistent with the aerosoltype distributions. Pollution aerosols have an EBR close to 70, desert dustvalues are on the order of 50 and EBR of marine aerosols is close to 25. Thescattering phase function shows an increase with the scattering angle closeto backscatter. The relative increase ∂ln<i>P</i>/∂γ isclose to 0.01 for dust and pollution type aerosols and 0.06 for marine typeaerosols. These values are consistent with those retrieved from Miesimulations

Aerosol extinction-to-backscatter ratio derived from passive satellite measurements