PollyNET / Pollynet_Processing_Chain

NRT lidar data processing program for multiwavelength polarization Raman lidar network (PollyNET)
https://polly.tropos.de/
GNU General Public License v3.0
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Implement molecular depolarization calibration for old Pollys. #93

Closed ZPYin closed 3 years ago

ZPYin commented 3 years ago

Problem

Old Polly did not have functionality for Delta-90 degree depolarization calibration, which makes molecular depolarization calibration the only applicable calibration method. But by far, the molecular depolarization calibration scheme is not implemented yet, which is essential for reprocessing all polly data.

Solution

Add a new depolarization calibration mode for depol_cali_mode to activate molecular depolarization calibration. And use Eq.(28) (Baars., 2012) to calculate depolarization calibration factor V*, in which the reference height can be obtained from the Rayleigh fitting.