Satellite passive microwave measurement is a known to be a promising tool to derive surface characteristics in natural and forested ecosystems as well as to monitor the vegetation canopy by itself (vegetation biomass, plant water content or vegetation phenology). Both objectives require a good parameterization of the vegetation canopy at the scale of the passive microwave radiometer field-of-view. This communication will present a new analysis of dense boreal forest extinction and scattering effects, parameterized respectively by the transmissivity (γ) linked to the vegetation optical thickness (τ) and single scattering albedo (ω) at the Advanced Microwave Scanning Radiometer on EOS (AMSR-E) frequencies. The values of (γ-ω) couples at each frequency are retrieved simultaneously using the simplified radiative transfer model called the τ-ω model widely used in the literature. Two datasets near Sept-Iles area (Québec) were used in the retrieval of the two parameters. A first dataset using summer AMSR-E data over three dense homogenous boreal sites during summer (July, August, September) of 2005 and 2008 and a second dataset using winter airborne 19 GHz measurements of snow under forest. The new retrieved (γ-ω) values are presented and discussed against literature. They are of particular relevance for various remote sensing applications based on AMSR-E observations over boreal forests such as soil moisture retrieval and snow characteristics monitoring.