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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 19, issue 5
Ann. Geophys., 19, 571–580, 2001
https://doi.org/10.5194/angeo-19-571-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 19, 571–580, 2001
https://doi.org/10.5194/angeo-19-571-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 May 2001

31 May 2001

Absolute density measurements in the middle atmosphere

M. Rapp1, J. Gumbel2, and F.-J. Lübken1 M. Rapp et al.
  • 1Leibniz Institute of Atmospheric Physics, Schlossstr. 6, 18225 Kühlungsborn, Germany
  • 2Department of Meteorology, Stockholm University, 10691 Stockholm, Sweden

Abstract. In the last ten years a total of 25 sounding rockets employing ionization gauges have been launched at high latitudes ( ~ 70° N) to measure total atmospheric density and its small scale fluctuations in an altitude range between 70 and 110 km. While the determination of small scale fluctuations is unambiguous, the total density analysis has been complicated in the past by aerodynamical disturbances leading to densities inside the sensor which are enhanced compared to atmospheric values. Here, we present the results of both Monte Carlo simulations and wind tunnel measurements to quantify this aerodynamical effect. The comparison of the resulting ‘ram-factor’ profiles with empirically determined density ratios of ionization gauge measurements and falling sphere measurements provides excellent agreement. This demonstrates both the need, but also the possibility, to correct aerodynamical influences on measurements from sounding rockets. We have determined a total of 20 density profiles of the mesosphere-lower-thermosphere (MLT) region. Grouping these profiles according to season, a listing of mean density profiles is included in the paper. A comparison with density profiles taken from the reference atmospheres CIRA86 and MSIS90 results in differences of up to 40%. This reflects that current reference atmospheres are a significant potential error source for the determination of mixing ratios of, for example, trace gas constituents in the MLT region.

Key words. Middle atmosphere (composition and chemistry; pressure, density, and temperature; instruments and techniques)

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