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Article Dans Une Revue Journal of Quantitative Spectroscopy and Radiative Transfer Année : 2007

Measurements of mid-stratospheric formaldehyde from the Odin/SMR instrument

P. Ricaud
Brice Barret
Franck Lefèvre

Résumé

Measurements of mid-stratospheric formaldehyde (H2CO) have been obtained from the limb-viewing sub-millimeter radiometer (SMR) instrument aboard the Odin satellite. The analysis is based upon the only weak (808→707) rotational transition line of H2CO that can be measured by Odin/SMR at 576.7083150 GHz in the band dedicated to the measurement of carbon monoxide (CO). The signal-to-noise ratio is increased by averaging about 1000 spectra within 2-km width vertical layers in the stratosphere over periods from 1 to 7 days and within 3 latitude bands: Southern Hemisphere (90°S–45°S), tropics (30°S–30°N), and Northern Hemisphere (45°N–90°N). The faint H2CO line can then be retrieved using the standard scientific ground-segment developed for the Odin/SMR measurements. The mid-stratospheric H2CO shows maxima in the tropics for every period considered (January 2006, February 2005, March 2005, and September 2005). The spring-time extra-tropical mid-stratospheric H2CO is more intense than the fall-time extra-tropical amounts. The simulations from the three-dimensional chemical-transport model Reprobus satisfactorily show these general features.
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hal-00138038 , version 1 (08-07-2021)

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P. Ricaud, D. Alexandre, Brice Barret, E. Le Flochmoen, Erwan Motte, et al.. Measurements of mid-stratospheric formaldehyde from the Odin/SMR instrument. Journal of Quantitative Spectroscopy and Radiative Transfer, 2007, 107 (1), pp.91-104. ⟨10.1016/j.jqsrt.2007.01.058⟩. ⟨hal-00138038⟩
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