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AGU: Geophysical Research Letters

 

Index Terms

  • Atmospheric Composition and Structure: Pressure, density, and temperature
  • Meteorology and Atmospheric Dynamics: Numerical modeling and data assimilation
  • Meteorology and Atmospheric Dynamics: Waves and tides

Abstract

A comparison of mesospheric temperatures from the Canadian Middle Atmosphere Model and HALOE observations: Zonal mean and signature of the solar diurnal tide

Andreas Jonsson

Department of Meteorology, Stockholm University, stockholm Sweden

Jean de Grandpré

Department of Earth and Atmospheric Science, York University, Toronto, Canada

John C. McConnell

Department of Earth and Atmospheric Science, York University, Toronto, Canada

Currently climate models are being extended to the middle atmosphere in order to investigate climate sensitivity in that region. This paper presents a comparison between the Canadian Middle Atmosphere Model (CMAM) climatology and 9 years of HALOE temperature measurements for the middle atmosphere. The analysis shows an overall agreement throughout the entire middle atmosphere with discrepancies within 10 K and less in various areas for both equinox and solstice conditions. For historical purposes, the analysis also includes a comparison with the CIRA-86 reference model. In this case, the results indicate a significant CIRA-86 warm anomaly in the upper mesosphere over the tropics which is particularly pronounced during equinox. Further analysis of the HALOE sunrise and sunset occultation measurements with the CMAM has revealed the signature of diurnal tides.

Published 15 May 2002.

Citation: Jonsson, A., J. de Grandpré, and J. C. McConnell (2002), A comparison of mesospheric temperatures from the Canadian Middle Atmosphere Model and HALOE observations: Zonal mean and signature of the solar diurnal tide, Geophys. Res. Lett., 29(9), 1346, doi:10.1029/2001GL014476.

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