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Stratomesospheric CO measured by a ground-based Fourier Transform Spectrometer over Poker Flat, Alaska: Comparisons with Odin/SMR and a 2-D model

N. Jones ; Y. Kasai ; E. Dupuy ; Y. Murayama ; Joachim Urban (Institutionen för radio- och rymdvetenskap, Global miljömätteknik) ; B. Barret ; M. Sinnhuber ; A. Kagawa ; T. Koshiro ; P. Ricaud ; Donal P. Murtagh (Institutionen för radio- och rymdvetenskap, Global miljömätteknik)
Journal of Geophysical Research - Atmospheres (0148-0227). Vol. 112 (2007), D20,
[Artikel, refereegranskad vetenskaplig]

The interseasonal variability of stratomesospheric CO is reported from Poker Flat, Alaska, using spectra from a ground-based Fourier Transform Spectrometer (gb-FTS) for the time period from 2000 to 2004. The CO spectra were analyzed using an optimal estimation technique that separates the tropospheric and stratospheric/mesospheric components into partial columns. The distribution of CO in the polar winter is such that the gb-FTS retrieved partial column is weighted to the mesosphere. The gb-FTS data are compared with measurements of partial column CO from the Sub-Millimeter Radiometer on board the Odin satellite and shown to be in very good agreement despite the relatively small sample size. The mean difference of the two data sets indicates a small positive bias (7.6 +/- 6%) in favor of the Odin data, with a correlation coefficient, r(2) = 0.91. The gb-FTS data indicate that there is a strong seasonal dependence of the CO partial column that is consistent with known winter polar thermospheric descent of CO enriched air. Year-to-year variability is explained in terms of mesospheric wind dynamics, which show 2004 and components of 2002 were affected by earlier than expected breakdown (30 +/- 13 d) of the winter polar circulation compared with 2000 to 2003. Finally, the measured CO data is compared with a 2-D chemical transport model that gives support to the idea that springtime polar mesospheric CO is driven by meridional winds.

Nyckelord: Stratosphere, Mesosphere, Atmospheric circulation, Carbon monoxide, Odin Sub-Millimetre Radiometer, Fourier Transform Infrared Spectroscopy

Denna post skapades 2007-10-22. Senast ändrad 2014-09-02.
CPL Pubid: 56287


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Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Global miljömätteknik (2005-2008)


Geovetenskap och miljövetenskap
Meteorologi och atmosfärforskning

Chalmers infrastruktur