Seasonal variation of nocturnal temperatures between 1 and 105 km altitude at 54° N observed by lidar M. Gerding1, J. Höffner1, J. Lautenbach1, M. Rauthe1,*, and F.-J. Lübken1 1Leibniz-Institute of Atmospheric Physics, Kühlungsborn, Germany *now at: Institut für Meteorologie und Klimaforschung, Universität Karlsruhe, Karlsruhe, Germany, Kühlungsborn, Germany
Abstract. Temperature soundings are performed by lidar at the mid-latitude
station of Kühlungsborn (Germany, 54° N,
12° E). The profiles cover the complete range from the
lower troposphere (~1 km) to the lower thermosphere
(~105 km) by simultaneous and co-located operation of a
Rayleigh-Mie-Raman lidar and a potassium resonance lidar.
Observations have been done during 266 nights between June 2002
and July 2007, each of 3–15 h length. This large and unique data
set provides comprehensive information on the altitudinal and
seasonal variation of temperatures from the troposphere to the
lower thermosphere. The remaining day-to-day-variability is
strongly reduced by harmonic fits at constant altitude levels and
a representative data set is achieved. This data set reveals a
two-level mesopause structure with an altitude of about 86–87 km
(~144 K) in summer and ~102 km (~170 K) during the
rest of the year. The average stratopause altitude is ~48 km
throughout the whole year, with temperatures varying between 258
and 276 K. From the fit parameters amplitudes and phases of
annual, semi-annual, and quarter-annual variations are derived.
The amplitude of the annual component is largest with amplitudes
of up to 30 K in 85 km, while the quarter-annual variation is
smallest and less than 3 K at all altitudes. The lidar data set is
compared with ECMWF temperatures below about 70 km altitude and
reference data from the NRLMSISE-00 model above. Apart from
the temperature soundings the aerosol backscatter ratio is
measured between 20 and 35 km. The seasonal variation of these
values is presented here for the first time.
Citation: Gerding, M., Höffner, J., Lautenbach, J., Rauthe, M., and Lübken, F.-J.: Seasonal variation of nocturnal temperatures between 1 and 105 km altitude at 54° N observed by lidar, Atmos. Chem. Phys., 8, 7465-7482, doi:10.5194/acp-8-7465-2008, 2008.