Abstract
Simultaneous measurements are reported of the nitrate radical (NO3), nitrogen dioxide (NO2), ozone (O3), and dimethylsulfide (DMS) in the nighttime marine boundary layer over Biscayne Bay in South Florida. These field observations are analyzed and used to initialize a boundary layer box model which examines the relative importance of the various sinks for NOx in the marine boundary layer. The results show that the observed lifetime of NO3 (≤6 min.) is probably controlled both by the loss of nitrogen pentoxide (N2O5) to reaction with water vapor and aerosols and by the reaction between NO3 and DMS. The model is then extended to investigate the loss of nitrogen oxides from an air parcel that remains in the boundary layer with a constant sea‐to‐air DMS flux for several days. The principal conclusions are (1) that DMS is a much more important sink for NO3 at lower NO2 levels and (2) that the reaction between NO3 and DMS is an important sink for DMS in the marine boundary layer and could exceed that of the daytime removal by OH.
Highlights
Theupperoceanby phytoplanktoanndevadesintothemarine N205mayalsoreactveryslowlywith gas-phasHe 20 to form boundarylayer(MBL), whereitsmixingratiorangesbetween about 40 and 300 parts per trillion by volume [Saltzmanand Cooper, 1989; Andreae, 1990; Bates et al, 1992]
SinceN205is coupledtoNO3throughtheequilibrium withNO2,theselosspathwaysforN205causetheindirectloss of NO3. It shouldbe notedthat althoughNO3 reactsvery rapidlywith a varietyof unsaturatehdydrocarbon[sAtkinson, 1991;Wayneet al., 1991], theconcentrationosf thesespecies in theMBL areunlikelyto be largeenoughfor theirreaction
NO3 thendroppedawayrapidlyas the wind switchedto containingTenaxat -20øC,andthe DMS is trappedon the the SSE, and it disappearedat dawn
Summary
Theupperoceanby phytoplanktoanndevadesintothemarine N205mayalsoreactveryslowlywith gas-phasHe 20 to form boundarylayer(MBL), whereitsmixingratiorangesbetween about 40 and 300 parts per trillion by volume (pptv) [Saltzmanand Cooper, 1989; Andreae, 1990; Bates et al, 1992]. Givena constanst ea-to-airflux of DMS and this sink,the expected NO3 thendroppedawayrapidlyas the wind switchedto containingTenaxat -20øC,andthe DMS is trappedon the the SSE, and it disappearedat dawn.
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