Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 7 5 2007 10.5194/acp-7-1305-2007 http://www.atmos-chem-phys.net/7/1305/2007/ http://www.atmos-chem-phys.net/7/1305/2007/acp-7-1305-2007.html http://www.atmos-chem-phys.net/7/1305/2007/acp-7-1305-2007.pdf 1305 1312 2007-02-26 Annual variation of strato-mesospheric carbon monoxide measured by ground-based Fourier transform infrared spectrometry V. Velazco voltaire@iup.physik.uni-bremen.de S. W. Wood M. Sinnhuber I. Kramer N. B. Jones Y. Kasai J. Notholt T. Warneke T. Blumenstock F. Hase F. J. Murcray O. Schrems Institute of Environmental Physics University of Bremen, Bremen, Germany National Institute of Water and Atmospheric Research Ltd, Lauder New Zealand Institute of Meteorology and Climate Research, Forschungszentrum Karlsruhe and Univ. Karlsruhe, Karlsruhe, Germany Department of Chemistry University of Wollongong, Wollongong, Australia Global Environment Division National Institute of Information and Communications Technology (NICT), Tokyo, Japan Department of Physics and Astronomy, University of Denver, Denver, Colorado, USA Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany We present long-term time-series of strato-mesospheric CO vertical columns measured from stations located in Antarctica, mid-latitudes and the Arctic, covering the period from 1997–2005. The instrument and the measurement technique allows the separation of tropospheric and strato-mesospheric contributions to the CO column, therefore providing information on the chemistry and dynamics both at low and high altitudes. Data from polar stations show a similar annual variability of strato-mesospheric CO with a strong maximum in late winter and spring. 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