Measurements of coarse mode and primary biological aerosol transmission through a tropical forest canopy using a dual-channel fluorescence aerosol spectrometer

Gabey, A. M.; Gallagher, M. W.; Whitehead, J.; Dorsey, J.
September 2009
Atmospheric Chemistry & Physics Discussions;2009, Vol. 9 Issue 5, p18965
Academic Journal
Aerosol in the size range 0.8-20 μm was characterized according to optical equivalent diameter, DP , morphology and the presence of biological material, the latter determined by recording fluorescence excited by ultraviolet light pulses at two different wavelengths. Single-particle measurements were performed within and subsequently above a tropical rainforest in Borneo, Malaysia, in June and July 2008. In both locations the aerosol number size distribution exhibited a primary biological aerosol (PBA) mode sized 2 μm2 μm and possessed a wider morphological range than non-PBA. It also accounted for around 80% of the total number in the understory and 40% of the total number above canopy. Canopy transmission efficiencies for the total aerosol number and PBA are calculated to be 0.48±0.19 and 0.31±0.15 respectively, with the former appearing to peak during the daytime because of a lack of PBA emission below the canopy.


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