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CCN properties of pollen from selected wind pollinated plants

Aerosol particles that act as cloud condensation nuclei (CCN) inuence cloud albedo and lifetime and thereby affect the planetary radiative balance. The indirect aerosol effect on climate is still one of the largest uncertainties and especially the role of biological particles is not yet well described. Pollen grains are primary biological particles that become airborne during the blooming season of plants. Pollen from wind pollinated plants represent a seasonally signifficant portion of the organic aerosol in the atmosphere. Intact pollen grains are rather large (10-100 μm) but under conditions of high humidity pollen grains have been shown to rupture and release cytoplasmic material including a large number of particles much smaller in size (0.5-5 μm).