Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 2 2007 10.5194/acpd-7-4781-2007 http://www.atmos-chem-phys-discuss.net/7/4781/2007/ http://www.atmos-chem-phys-discuss.net/7/4781/2007/acpd-7-4781-2007.html http://www.atmos-chem-phys-discuss.net/7/4781/2007/acpd-7-4781-2007.pdf 4781 4855 2007-04-05 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 A. Stickler stickler@mpch-mainz.mpg.de H. Fischer H. Bozem C. Gurk C. Schiller M. Martinez-Harder D. Kubistin H. Harder J. Williams G. Eerdekens N. Yassaa L. Ganzeveld R. Sander J. Lelieveld Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany Department of Chemistry, York University, Toronto, Canada now at: Department of Earth System Science, University Wageningen, The Netherlands now at: Institute for Atmospheric and Climate Science, ETH Zürich, Switzerland We present a comparison of different Lagrangian and steady state box model runs with measurement data obtained during the GABRIEL campaign over the tropical Atlantic Ocean and the rainforest in the Guyanas, October 2005. Lagrangian modelling of boundary layer (BL) CO constrained by measurements of reactive trace gases and radiation is used to derive a horizontal gradient (≈5.6 pmol/mol km^−1) of this compound from the ocean to the rainforest (east to west). This is significantly smaller than that derived from the measurements (16–48 pmol/mol km^−1), indicating that photochemical production from organic precursors alone cannot explain the observed strong gradient. It appears that HCHO is overestimated by the Lagrangian and "steady state" models, which include dry deposition but not exchange with the free troposphere (FT). The relatively short lifetime of HCHO (50–100 min) implies substantial BL-FT exchange. The mixing-in of FT air affected by African and South American biomass burning at an estimated rate of 0.12 h^−1 increases the CO and lowers the HCHO mixing ratios, leading to a better agreement with measurements. A 24 h mean deposition velocity of 1.35 cm/s for H₂O₂ over the ocean as well as over the rainforest is deduced assuming BL-FT exchange adequate to the results for CO. The measured increase of the organic peroxides from the ocean to the rainforest (≈0.66 nmol/mol d^−1) is significantly overestimated by the Lagrangian model, even when using high values for the deposition velocity and the entrainment rate. 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