Ceilometer: Time-Height Cross Sections
Quicklook and Archive

Range Corrected Signal: 06.11.2022

Munich: MIM-Ceilometer Lufft CHM15kx (blueYALIS) @ 1064 nm

Munich: MIM-Ceilometer Lufft CHM8k (redYALIS) @ 905 nm (+)

Schneefernerhaus: UFS-Ceilometer Lufft CHM15kx @ 1064 nm

  Data from 06.11.2022

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Archive: November 2022


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Quicklooks of the „range corrected signal“ of our ALC (Automatic low-power lidar and ceilometer) testbed operated in the framework of ACTRIS:

In addtion, the Vaisala CL61 provides measurements of the Volume Linear Depolarization Ratio at 910 nm.

The instruments are usually located on the roof of the Meteorological Institute (MIM) of the Ludwig-Maximilians-Universität (48.148 N, 11.573 E, altitude 539 m), unless otherwise stated in the case of calibration or measurement campaigns.

We are grateful that we are allowed to process the corresponding data (since 1. June 2010) of the CHM15k ceilometer located at the Umweltforschungsstation Schneefernerhaus on Zugspitze (UFS, altitude 2712 m, 93 km south of Munich), owned by the UFS and operated by the German Weather Service for comparison.

Range corrected signal

The range corrected signal is proportional to the attenuated backscatter, and in first approximation proportional to the backscatter coefficient of particles. The backscatter coefficient is an indication for the „amount of aerosols“. The signals at 903 nm (redYALIS) are also influenced by water vapor absorption. The images show clouds in white (very strong backscatter signal) and aerosols in green and yellow (medium strong signal). Extended white and red areas down to the ground indicate rain. Note, that „steps“ in the colored areas (visible until 27. October 2014 for the blueYALIS measurements) are due to automatically changed settings of the ceilometer's detection unit.

History of blueYALIS

History of redYALIS


Examples with explanations are shown here

Further reading