Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 10 2 2010 10.5194/acpd-10-3173-2010 http://www.atmos-chem-phys-discuss.net/10/3173/2010/ http://www.atmos-chem-phys-discuss.net/10/3173/2010/acpd-10-3173-2010.html http://www.atmos-chem-phys-discuss.net/10/3173/2010/acpd-10-3173-2010.pdf 3173 3187 2010-02-05 Co-located column and in situ measurements of CO₂ in the tropics compared with model simulations T. Warneke warneke@iup.physik.uni-bremen.de A. K. Petersen C. Gerbig A. Jordan C. Rödenbeck M. Rothe R. Macatangay J. Notholt O. Schrems Institute of Environmental Physics, University of Bremen, Bremen, Germany Max Planck Institute for Biogeochemistry (MPI-BGC), Jena, Germany Alfred Wegener Institute for Polar and Marine Research (AWI), Bremerhaven, Germany The first ground-based remote sensing measurements of the column averaged volume mixing ratio of CO₂ (XCO₂) for the inner tropics have been obtained at Paramaribo, Suriname (5.8° N, 55.2° W). The remote sensing observations are complemented by surface air-samples collected at the site, analyzed for CO₂ and ¹³CO₂. The surface in-situ measurements are strongly influenced by local sources. From the isotopic composition of the air samples the local source component is suggested to be dominated by the terrestrial biosphere. Using δ¹³C from the NOAA/ESRL stations Ascension Is. (ASC), 7.9° S, 14.4° W, and Ragged Point (RPB), 7.9° S, 14.4° W, the data has been corrected for the local source component. 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