ppcpy.qc.transCor#

Functions

transCorGHK_channel

Corrects the effect of different polarization-dependent transmission inside the total and depol channel.

transCorGHK_cube

transCor_E16_channel

transmission correction for the total channel using the Mattis 2009/Engelmann 2016 method
ppcpy.qc.transCor.transCorGHK_cube(data_cube, signal='BGCor')[source]#
ppcpy.qc.transCor.transCor_E16_channel(sigT, bgT, voldepol, HT)[source]#

transmission correction for the total channel using the Mattis 2009/Engelmann 2016 method

sigTarray

Signal in total channel (background-corrected)

bgTarray

Background in total channel

voldepolarray

Volume depolarization ratio

HTfloat

Transmission ratio of total channel in GHK notation

sigTCorarray

Signal in total channel corrected for polarization induced transmission effects

bgTCorarray

Background of total signal

Following [1] in the notation of [2]

\[P_{i, ext{corr}} = P_i\]

rac{1 + R_idelta^V}{1+delta^V}

with the signal \(P_i\), the transmission ratio \(R_i\) and the volume depolarization ratio \(delta^V\)

Clarify the background treatment. The bgTCor should not change (i.e. assuming the vdr is 0?

ppcpy.qc.transCor.transCorGHK_channel(sigT, bgT, sigC, bgC, transGT=1, transGR=1, transHT=0, transHR=-1, polCaliEta=1, polCaliEtaStd=0)[source]#

Corrects the effect of different polarization-dependent transmission inside the total and depol channel.

PollyNET/Pollynet_Processing_Chain

INPUTS:
sigT: array

Signal in total channel.

bgT: array

Background in total channel.

sigC: array

Signal in cross channel.

bgC: array

Background in cross channel.

transGT: float

G parameter in total channel.

transGR: float

G parameter in cross channel.

transHT: float

H parameter in total channel.

transHR: float

H parameter in cross channel.

polCaliEta: float

Depolarization calibration constant (eta).

polCaliEtaStd: float

Uncertainty of the depolarization calibration constant.

OUTPUTS:
sigTCor: array

Transmission corrected elastic signal.

bgTCor: array

Background of transmission corrected elastic signal.

References

Mattis, I., Tesche, M., Grein, M., Freudenthaler, V., and Müller, D.: Systematic error of lidar profiles caused by a polarization-dependent receiver transmission: Quantification and error correction scheme, Appl. Opt., 48, 2742-2751, 2009. Freudenthaler, V. About the effects of polarising optics on lidar signals and the Delta90 calibration. Atmos. Meas. Tech., 9, 4181–4255 (2016).

HISTORY:

  • 2021-05-27: First edition by Zhenping.

  • 2024-08-14: Change to GHK parameterization by Moritz.

  • 2024-12-28: AI translation

Authors: - zhenping@tropos.de, haarig@tropos.de