Air-Sea exchange of biogenic volatile organic compounds and the impact on aerosol particle size distributions

作者：Kim Michelle J; Novak Gordon A; Zoerb Matthew C; Yang Mingxi; Blomquist Byron W; Huebert Barry J; Cappa Christopher D; Bertram Timothy H^*

来源：Geophysical Research Letters, 2017, 44(8): 3887-3896.

DOI：10.1002/2017GL072975

• air-sea exchange
• marine trace gases
• secondary organic aerosol

We report simultaneous, underway eddy covariance measurements of the vertical flux of isoprene, total monoterpenes, and dimethyl sulfide (DMS) over the Northern Atlantic Ocean during fall. Mean isoprene and monoterpene sea-to-air vertical fluxes were significantly lower than mean DMS fluxes. While rare, intense monoterpene sea-to-air fluxes were observed, coincident with elevated monoterpene mixing ratios. A statistically significant correlation between isoprene vertical flux and short wave radiation was not observed, suggesting that photochemical processes in the surface microlayer did not enhance isoprene emissions in this study region. Calculations of secondary organic aerosol production rates (P-SOA) for mean isoprene and monoterpene emission rates sampled here indicate that P-SOA is on average <0.1 mu gm(-3)d(-1). Despite modest P-SOA, low particle number concentrations permit a sizable role for condensational growth of monoterpene oxidation products in altering particle size distributions and the concentration of cloud condensation nuclei during episodic monoterpene emission events from the ocean.

• 出版日期2017-4-28