Articles | Volume 26, issue 5
Ann. Geophys., 26, 1083–1088, 2008
https://doi.org/10.5194/angeo-26-1083-2008

Special issue: Atmospheric studies by optical methods

Ann. Geophys., 26, 1083–1088, 2008
https://doi.org/10.5194/angeo-26-1083-2008

  28 May 2008

28 May 2008

The thermal structure at the topside and above of polar mesosphere summer echoes over Spitsbergen 78° N

J. Lautenbach, J. Höffner, F.-J. Lübken, and M. Zecha J. Lautenbach et al.
  • Leibniz-Institute of Atmospheric Physics, Schlossstraße 6, 18225 Kühlungsborn, Germany

Abstract. Simultaneous measurements of temperature and polar mesosphere summer echoes (PMSE) were performed at the polar cap (78° N) during summer 2001 and 2003. In summer time the mesopause region is characterized by extremely low temperatures around 120 K. It is remarkable that PMSE are practically never observed above 92 km although temperatures are low enough to allow the existence of ice particles. In this case study we compare the PMSE topside with temperatures measured by the potassium lidar and with frost point temperatures using water-vapor mixing ratios from models. We find striking discrepancies with our current understanding of ice particles and temperature in this region. In this case study we find that the temperature can be more than 20 K lower than the frost point temperature but no PMSE is observed above 92 km altitude. We show that the lack of PMSE does not necessarily imply that the temperature is too high.