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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 9
Ann. Geophys., 15, 1221–1231, 1997
https://doi.org/10.1007/s00585-997-1221-9
© European Geosciences Union 1997

Special issue: Wind Measurements

Ann. Geophys., 15, 1221–1231, 1997
https://doi.org/10.1007/s00585-997-1221-9
© European Geosciences Union 1997

  30 Sep 1997

30 Sep 1997

Mean vertical wind in the mesosphere-lower thermosphere region (80–120 km) deduced from the WINDII observations on board UARS

V. Fauliot1, G. Thuillier1, and F. Vial2 V. Fauliot et al.
  • 1Service d'Aéronomie du CNRS, Bp 3, F-91 371 Verrières le Buisson, France
  • 2Laboratoire de Metéorologie Dynamique du CNRS, Ecole Polytechnique, F-91128 Palaiseau, France

Abstract. The WINDII interferometer placed on board the Upper Atmosphere Research Satellite measures temperature and wind from the O(1S) green-line emission in the Earth's mesosphere and lower thermosphere. It is a remote-sensing instrument providing the horizontal wind components. In this study, the vertical winds are derived using the continuity equation. Mean wind annually averaged at equinoxes and solstices is shown. Ascendance and subsidence to the order of 1–2 cm s–1 present a seasonal occurrence at the equator and tropics. Zonal Coriolis acceleration and adiabatic heating and cooling rate associated to the mean meridional and vertical circulations are evaluated. The line emission rate measured together with the horizontal wind shows structures in altitude and latitude correlated with the meridional and vertical wind patterns. The effect of wind advection is discussed.

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