09 Aug 2023
 | 09 Aug 2023
Status: this preprint is open for discussion and under review for Atmospheric Measurement Techniques (AMT).

Lidar depolarization characterization using a reference system

Alkistis Papetta, Franco Marenco, Rodanthi-Elisavet Mamouri, Argyro Nisantzi, Ioana Elisabeta Popovici, Philippe Goloub, Maria Kezoudi, Stephane Victori, and Jean Sciare

Abstract. In this study, we will present a new approach for the determination of depolarization parameters of the Nicosia CIMEL CE376 lidar system, using the PollyXT in Limassol as a reference instrument. The method is applied retrospectively to the valuable measurements obtained during the 2021 Cyprus Fall campaign. Lidar depolarization measurements represent valuable information for aerosol typing and for the quantification of some specific aerosol types such as dust and volcanic ash. An accurate characterization is required for quality measurements and to remove instrumental artefacts. This article uses the PollyXT reference calibrated depolarization lidar to evaluate our system's gain ratio and channel cross-talk. This approach uses observations of transported dust from desert regions, with layers in the free troposphere. Above the boundary layer and the highest terrain elevation of the region, we can expect that for long transport aerosols local effects should not affect the aerosol mixture so that we can expect similar depolarization properties at the two stations (separated by ∼60 km). Algebraic equations are used to derive depolarization parameters from the comparison of the volume depolarization ratio measured by the two systems. The applied methodology offers a promising opportunity to evaluate the depolarization parameters of a lidar system, in cases where a priori knowledge of the cross-talk parameters is not available.

Alkistis Papetta et al.

Status: open (until 04 Oct 2023)

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  • RC1: 'Comment on egusphere-2023-1338', Anonymous Referee #1, 13 Sep 2023 reply

Alkistis Papetta et al.

Alkistis Papetta et al.


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Short summary
Method for determining the depolarization parameters using observations from a reference instrument at a nearby location. Needed for systems where a priori knowledge of the cross-talk parameters is not available. Uses 3-parameter equations to compare VDR between two co-located lidars at dust and molecular layers. It can be applied retrospectively to existing valuable data acquired during campaigns. Its application on CIMEL CE376 corrected VDR bias at high and low depolarizing layers.