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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 8, issue 4 | Copyright
Atmos. Meas. Tech., 8, 1875-1885, 2015
https://doi.org/10.5194/amt-8-1875-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 23 Apr 2015

Research article | 23 Apr 2015

Low-level mixing height detection in coastal locations with a scanning Doppler lidar

V. Vakkari1, E. J. O'Connor1,2, A. Nisantzi3, R. E. Mamouri3, and D. G. Hadjimitsis3 V. Vakkari et al.
  • 1Finnish Meteorological Institute, Helsinki, Finland
  • 2Meteorology Department, University of Reading, Reading, UK
  • 3Cyprus University of Technology, Limassol, Cyprus

Abstract. Mixing layer height (MLH) is one of the key parameters in describing lower tropospheric dynamics and capturing its diurnal variability is crucial, especially for interpreting surface observations. In this paper we introduce a method for identifying MLH below the minimum range of a scanning Doppler lidar when operated at vertical. The method we propose is based on velocity variance in low-elevation-angle conical scanning and is applied to measurements in two very different coastal environments: Limassol, Cyprus, during summer and Loviisa, Finland, during winter. At both locations, the new method agrees well with MLH derived from turbulent kinetic energy dissipation rate profiles obtained from vertically pointing measurements. The low-level scanning routine frequently indicated non-zero MLH less than 100 m above the surface. Such low MLHs were more common in wintertime Loviisa on the Baltic Sea coast than during summertime in Mediterranean Limassol.

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