Three-channel single-wavelength lidar depolarization calibration
Linear depolarization measurement capabilities were added to the CANDAC Rayleigh–Mie–Raman lidar (CRL) at Eureka, Nunavut, in the Canadian High Arctic in 2010. This upgrade enables measurements of the phases (liquid versus ice) of cold and mixed-phase clouds throughout the year, including during pol...
Published in: | Atmospheric Measurement Techniques |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00007315 2023-05-15T15:06:59+02:00 Three-channel single-wavelength lidar depolarization calibration McCullough, Emily M. Sica, Robert J. Drummond, James R. Nott, Graeme J. Perro, Christopher Duck, Thomas J. 2018-02 electronic https://doi.org/10.5194/amt-11-861-2018 https://noa.gwlb.de/receive/cop_mods_00007315 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007272/amt-11-861-2018.pdf https://amt.copernicus.org/articles/11/861/2018/amt-11-861-2018.pdf eng eng Copernicus Publications Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-11-861-2018 https://noa.gwlb.de/receive/cop_mods_00007315 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007272/amt-11-861-2018.pdf https://amt.copernicus.org/articles/11/861/2018/amt-11-861-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/amt-11-861-2018 2022-02-08T22:58:34Z Linear depolarization measurement capabilities were added to the CANDAC Rayleigh–Mie–Raman lidar (CRL) at Eureka, Nunavut, in the Canadian High Arctic in 2010. This upgrade enables measurements of the phases (liquid versus ice) of cold and mixed-phase clouds throughout the year, including during polar night. Depolarization measurements were calibrated according to existing methods using parallel- and perpendicular-polarized profiles as discussed in ). We present a new technique that uses the polarization-independent Rayleigh elastic channel in combination with one of the new polarization-dependent channels, and we show that for a lidar with low signal in one of the polarization-dependent channels this method is superior to the traditional method. The optimal procedure for CRL is to determine the depolarization parameter using the traditional method at low resolution (from parallel and perpendicular signals) and then to use this value to calibrate the high-resolution new measurements (from parallel and polarization-independent Rayleigh elastic signals). Due to its use of two high-signal-rate channels, the new method has lower statistical uncertainty and thus gives depolarization parameter values at higher spatial–temporal resolution by up to a factor of 20 for CRL. This method is easily adaptable to other lidar systems which are considering adding depolarization capability to existing hardware. Article in Journal/Newspaper Arctic Eureka Nunavut polar night Niedersächsisches Online-Archiv NOA Arctic Eureka ENVELOPE(-85.940,-85.940,79.990,79.990) Nunavut Atmospheric Measurement Techniques 11 2 861 879 |
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English |
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article Verlagsveröffentlichung McCullough, Emily M. Sica, Robert J. Drummond, James R. Nott, Graeme J. Perro, Christopher Duck, Thomas J. Three-channel single-wavelength lidar depolarization calibration |
topic_facet |
article Verlagsveröffentlichung |
description |
Linear depolarization measurement capabilities were added to the CANDAC Rayleigh–Mie–Raman lidar (CRL) at Eureka, Nunavut, in the Canadian High Arctic in 2010. This upgrade enables measurements of the phases (liquid versus ice) of cold and mixed-phase clouds throughout the year, including during polar night. Depolarization measurements were calibrated according to existing methods using parallel- and perpendicular-polarized profiles as discussed in ). We present a new technique that uses the polarization-independent Rayleigh elastic channel in combination with one of the new polarization-dependent channels, and we show that for a lidar with low signal in one of the polarization-dependent channels this method is superior to the traditional method. The optimal procedure for CRL is to determine the depolarization parameter using the traditional method at low resolution (from parallel and perpendicular signals) and then to use this value to calibrate the high-resolution new measurements (from parallel and polarization-independent Rayleigh elastic signals). Due to its use of two high-signal-rate channels, the new method has lower statistical uncertainty and thus gives depolarization parameter values at higher spatial–temporal resolution by up to a factor of 20 for CRL. This method is easily adaptable to other lidar systems which are considering adding depolarization capability to existing hardware. |
format |
Article in Journal/Newspaper |
author |
McCullough, Emily M. Sica, Robert J. Drummond, James R. Nott, Graeme J. Perro, Christopher Duck, Thomas J. |
author_facet |
McCullough, Emily M. Sica, Robert J. Drummond, James R. Nott, Graeme J. Perro, Christopher Duck, Thomas J. |
author_sort |
McCullough, Emily M. |
title |
Three-channel single-wavelength lidar depolarization calibration |
title_short |
Three-channel single-wavelength lidar depolarization calibration |
title_full |
Three-channel single-wavelength lidar depolarization calibration |
title_fullStr |
Three-channel single-wavelength lidar depolarization calibration |
title_full_unstemmed |
Three-channel single-wavelength lidar depolarization calibration |
title_sort |
three-channel single-wavelength lidar depolarization calibration |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/amt-11-861-2018 https://noa.gwlb.de/receive/cop_mods_00007315 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007272/amt-11-861-2018.pdf https://amt.copernicus.org/articles/11/861/2018/amt-11-861-2018.pdf |
long_lat |
ENVELOPE(-85.940,-85.940,79.990,79.990) |
geographic |
Arctic Eureka Nunavut |
geographic_facet |
Arctic Eureka Nunavut |
genre |
Arctic Eureka Nunavut polar night |
genre_facet |
Arctic Eureka Nunavut polar night |
op_relation |
Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-11-861-2018 https://noa.gwlb.de/receive/cop_mods_00007315 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007272/amt-11-861-2018.pdf https://amt.copernicus.org/articles/11/861/2018/amt-11-861-2018.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/amt-11-861-2018 |
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Atmospheric Measurement Techniques |
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11 |
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2 |
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861 |
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879 |
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