Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 3 2007 10.5194/acpd-7-9183-2007 http://www.atmos-chem-phys-discuss.net/7/9183/2007/ http://www.atmos-chem-phys-discuss.net/7/9183/2007/acpd-7-9183-2007.html http://www.atmos-chem-phys-discuss.net/7/9183/2007/acpd-7-9183-2007.pdf 9183 9202 2007-06-28 The influence of biogenic emissions on upper-tropospheric methanol as revealed from space G. Dufour dufour@lisa.univ-paris12.fr S. Szopa D. A. Hauglustaine C. D. Boone C. P. Rinsland P. F. Bernath Laboratoire de Météorologie Dynamique/Institut Pierre Simon Laplace (LMD/IPSL), Palaiseau, France Laboratoire des Sciences du Climat et de l'Environnement (LSCE/IPSL), CNRS-CEA-UVSQ Gif-sur-Yvette, France Department of Chemistry, University of Waterloo, Ontario, N2L 3G1, Canada NASA Langley Research Center, Hampton, VA, USA Deparment of Chemistry, University of York, Heslington, York, YO10 5DD, UK now at: Laboratoire Inter-universitaire des Systèmes Atmosphériques (LISA), Universités Paris 12 et Paris 7, CNRS, Créteil, France The distribution and budget of oxygenated organic compounds in the atmosphere and their impact on tropospheric chemistry are still poorly constrained. Near-global space-borne measurements of seasonally resolved upper tropospheric profiles of methanol by the ACE Fourier transform spectrometer provide a unique opportunity to evaluate our understanding of this important oxygenated organic species. The comparison with distributions simulated by a state-of-the-art chemistry transport model shows fair agreement during the March 2004 to August 2005 period with about 50% of the measurements reproduced by the model within 50%. However, in the northern hemisphere and during summertime, the satellite measurements reveal that the emissions from the continental biosphere lead to upper-tropospheric methanol concentrations significantly higher than expected. Bernath, P. F., McElroy, C. T., Abrams, M. C., Boone, C. D., Butler, M., Camy-Peyret, C., Carleer, M., Clerbaux, C., Coheur, P.-F., Colin, R., DeCola, P., DeMazière, M., Drummond, J. R., Dufour, D., Evans, W. F. J., Fast, H., Fussen, D., Gilbert, K., Jennings, D. E., Llewellyn, E. J., Lowe, R. P., Mahieu, E., McConnell, J. C., McHugh, M., McLeod, S. D., Michaud, R., Midwinter, C., Nassar, R., Nichitiu, F., Nowlan, C., Rinsland, C. P., Rochon, Y. J., Rowlands, N., Semeniuk, K., Simon, P., Skelton, R., Sloan, J. 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