Airborne pollen observations using a multi-wavelength Raman polarization lidar in Finland: Characterization of pure pollen types - Shang, Xiaoxia; Giannakaki, Elina; Bohlmann, Stephanie; Filioglou, Maria; Saarto, Annika; Ruuskanen, Antti; Leskinen, Ari; Romakkaniemi, Sami; Komppula, Mika (Atmospheric Chemistry and Physics Discussions, 2020)