Global measurement of the mesospheric sodium layer by the star occultation instrument GOMOS

  • Fussen D
  • Vanhellemont F
  • Bingen C
 et al. 
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{[} 1] We present the first global measurement of the sodium mesospheric
layer obtained from the processing of about 100 000 star occultations by
the GOMOS instrument onboard the ENVISAT satellite. The retrieval method
is developed on the basis of a simple DOAS retrieval applied to averaged
transmittances. The vertical inversion of the sodium slant path optical
thickness is performed by using a modified Gaussian extinction profile.
A global climatology is derived by using monthly bins of 20 degrees in
latitude. The high variability of the sodium layer is confirmed on a
global scale as well as the presence of an important modulation in the
annual cycle. Also, we present some evidence for the existence of a
diurnal cycle characterized by an increase of the sodium concentration
in daylight.

Author-supplied keywords

  • 0340 Atmospheric composition and structure: Middle atmosphere - Composition and chemistry
  • 0360 Atmospheric composition and structure: Transmission and scattering of radiation
  • 1640 Global change: Remote sensing

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