21 Nov 2023
 | 21 Nov 2023
Status: this preprint is open for discussion and under review for Atmospheric Measurement Techniques (AMT).

Enhancing Mobile Aerosol Monitoring with CE376 Dual-Wavelength Depolarization Lidar

Maria Fernanda Sanchez Barrero, Ioana Elisabeta Popovici, Philippe Goloub, Stéphane Victori, Qiaoyun Hu, Benjamin Torres, Thierry Podvin, Luc Blarel, Gaël Dubois, Fabrice Ducos, Eric Bourrianne, Aliaksandr Lapionak, Lelia Proniewski, Brent Holben, David Matthew Giles, and Anthony LaRosa

Abstract. We present the capabilities of a compact dual-wavelength depolarization lidar to assess the spatio-temporal variations in aerosol properties aboard moving vectors. Our approach involves coupling the lightweight CIMEL CE376 lidar, which provides measurements at 532 nm and 808 nm and depolarization at 532 nm, with a photometer to monitor aerosol properties. The assessments, both algorithmic and instrumental, were conducted at ATOLL (ATmospheric Observatory of liLLe) platform operated by the Laboratoire d’Optique Atmosphérique (LOA), in Lille France. An early version of the CE376 lidar co-located with the CE318-T photometer and with a multi-wavelength Raman lidar were considered for comparisons and validation. We developed a modified Klett inversion method for simultaneous two-wavelength elastic lidar and photometer measurements. Using this setup, we characterized aerosols during two distinct events of Saharan dust and dust smoke aerosols transported over Lille in spring 2021 and summer 2022. For validation purposes, comparisons against the Raman lidar were performed, demonstrating good agreement in aerosols properties with relative differences of up to 12 % in the depolarization measurements. Moreover, a first dataset of CE376 lidar and photometer performing on-road measurements was obtained during the FIREX-AQ (Fire Influence on Regional to Global Environments and Air Quality) field campaign, deployed in summer 2019 over the Northwestern USA. By lidar and photometer mapping in 3D, we investigated the transport of released smoke from active fire spots at William Flats (North East WA, USA). Despite the extreme environmental conditions, our study enabled the investigation of aerosol optical properties near the fire source, distinguishing the influence of diffuse, convective, and residual smoke. Backscatter, extinction profiles, and column-integrated lidar ratios at 532 and 808 nm were retrieved for a quality-assured dataset. Additionally, Extinction Angstrom Exponent (EAE), Color Ratio (CR), Attenuated Color Ratio (ACR) and Particle Linear Depolarization Ratio (PLDR) were derived. In this study, we discuss the capabilities (and limitations) of the CE376 lidar in bridging observational gaps in aerosol monitoring, providing valuable insights for future research in this field.

Maria Fernanda Sanchez Barrero et al.

Status: open (until 27 Dec 2023)

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Maria Fernanda Sanchez Barrero et al.

Maria Fernanda Sanchez Barrero et al.


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Short summary
This study showcases the use of a compact elastic lidar to monitor aerosols aboard moving platforms. By coupling dual-wavelength and depolarization measurements with photometer data, we studied aerosols during events of Saharan dust and smoke transport. Our research, conducted in various scenarios, not only validated our methods, but also offered insights into the atmospheric dynamics near active fires. This study aids future research to fill observational gaps in aerosols monitoring.