Journal article

Annual variation of strato-mesospheric carbon monoxide measured by ground-based Fourier transform infrared spectrometry

Velazco V, Wood S, Sinnhuber M, Kramer I, Jones N, Kasai Y, Notholt J, Warneke T, Blumenstock T, Hase F, Murcray F, Schrems O ...see all

Atmospheric Chemistry and Physics, vol. 7, issue 5 (2007) pp. 1305-1312

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We present long-term time-series of stratomesospheric 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. A sma ll enhancement in late summer for some stations, which we call the "summer bulge", can be seen occasionally. Generally, the mid-latitude stations show no significant annual variability of strato-mesospheric CO columns. Measurements were compared with a two-dimensional chemistry-transport model of the middle atmosphere. The annual and latitudinal variations of CO are reproduced well by a model run including thermospheric CO. Comparison with two model scenarios show that the polar winter maximum is due solely to downward transport of thermospheric CO, while CHO X chemistry in the stratosphere could probably contribute to the summer maximum.

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  • V. Velazco

  • S. W. Wood

  • M. Sinnhuber

  • I. Kramer

  • N. B. Jones

  • Y. Kasai

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