Biogenic nonmethane hydrocarbon emissions estimated from tethered balloon observations

A new technique for estimating surface fluxes of trace gases, the mixed-layer gradient technique, is used to calculate isoprene and terpene emissions from forests. Profiles from the Amazon give a mean daytime emission of 3630±1400μg isoprene m^-2h^-1, where the uncertainty represents the standard deviation of the mean of eight flux estimates. Twenty profiles from Alabama give emissions of 4470±3300 μg isoprene m^-2h^-1, 1740±1060 μg alpha-pinene m^-2 h^-1, and 790±560 μg beta-pinene m^-2h^-1, respectively -from Authors