Atmospheric Chemistry and Physics Chemistry, transport and dry deposition of trace gases in the boundary layer over the tropical Atlantic Ocean and the Guyanas during the GABRIEL field campaign (original) (raw)
We present a comparison of different Lagrangian and chemical box model calculations with measurement data obtained during the GABRIEL campaign over the tropical Atlantic Ocean and the Amazon rainforest in the Guyanas, October 2005. Lagrangian modelling of boundary layer (BL) air constrained by measurements is used to derive a horizontal gradient (≈5.6 pmol/mol km −1) of CO from the ocean to the rainforest (east to west). This is signifi-cantly smaller than that derived from the measurements (16– 48 pmol/mol km −1), indicating that photochemical produc-tion from organic precursors alone cannot explain the ob-served strong gradient. It appears that HCHO is overesti-mated by the Lagrangian and chemical box models, which include dry deposition but not exchange with the free tropo-sphere (FT). The relatively short lifetime of HCHO implies substantial BL-FT exchange. The mixing-in of FT air af-fected by African and South American biomass burning at an estimated rate of 0.12 h −1 increases...
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