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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

Journal Article


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Abstract


  • 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, r2 = 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.

Authors


  •   Jones, Nicholas B.
  •   Kasai, Y (external author)
  •   Dupuy, Eric (external author)
  •   Murayama, Y. (external author)
  •   Urban, J (external author)
  •   Barret, B (external author)
  •   Sinnhuber, M (external author)
  •   Kagawa, A (external author)
  •   Koshiro, T. (external author)
  •   Ricaud, p (external author)
  •   Murtagh, D (external author)

Publication Date


  • 2007

Citation


  • Jones, N. B., Kasai, Y., Dupuy, E., Murayama, Y., Urban, J., Barret, B., Sinnhuber, M., Kagawa, A., Koshiro, T., Ricaud, p. & Murtagh, D. (2007). Stratomesospheric CO measured by a ground-based Fourier transform spectrometer over Poker Flat, Alaska: Comparisons with Odin/SMR and a 2-D model. Journal of Geophysical Research, 112 (D20), 1-16.

Scopus Eid


  • 2-s2.0-37349048454

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=6876&context=scipapers

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/3534

Has Global Citation Frequency


Number Of Pages


  • 15

Start Page


  • 1

End Page


  • 16

Volume


  • 112

Issue


  • D20

Place Of Publication


  • United States

Abstract


  • 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, r2 = 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.

Authors


  •   Jones, Nicholas B.
  •   Kasai, Y (external author)
  •   Dupuy, Eric (external author)
  •   Murayama, Y. (external author)
  •   Urban, J (external author)
  •   Barret, B (external author)
  •   Sinnhuber, M (external author)
  •   Kagawa, A (external author)
  •   Koshiro, T. (external author)
  •   Ricaud, p (external author)
  •   Murtagh, D (external author)

Publication Date


  • 2007

Citation


  • Jones, N. B., Kasai, Y., Dupuy, E., Murayama, Y., Urban, J., Barret, B., Sinnhuber, M., Kagawa, A., Koshiro, T., Ricaud, p. & Murtagh, D. (2007). Stratomesospheric CO measured by a ground-based Fourier transform spectrometer over Poker Flat, Alaska: Comparisons with Odin/SMR and a 2-D model. Journal of Geophysical Research, 112 (D20), 1-16.

Scopus Eid


  • 2-s2.0-37349048454

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=6876&context=scipapers

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/3534

Has Global Citation Frequency


Number Of Pages


  • 15

Start Page


  • 1

End Page


  • 16

Volume


  • 112

Issue


  • D20

Place Of Publication


  • United States