Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Optical properties and possible origins of atmospheric aerosols over LHAASO in the eastern margin of Tibetan Plateau

Junji Xia
* ,
Fengrong Zhu
* ,
Xingbing Zhao
,
Jing Liu
,
Hu Liu
ORCID logo ,
Guotao Yuan
,
Qinning Sun
,
Lei Xie
,
Min Jin
,
Long Chen
,
Yang Wang
,
Yu Liu
ORCID logo ,
Tengfei Song
ORCID logo
Version 1 : Received: 20 March 2024 / Approved: 20 March 2024 / Online: 20 March 2024 (11:03:15 CET)

How to cite: Xia, J.; Zhu, F.; Zhao, X.; Liu, J.; Liu, H.; Yuan, G.; Sun, Q.; Xie, L.; Jin, M.; Chen, L.; Wang, Y.; Liu, Y.; Song, T. Optical properties and possible origins of atmospheric aerosols over LHAASO in the eastern margin of Tibetan Plateau. Preprints 2024, 2024031206. https://doi.org/10.20944/preprints202403.1206.v1 Xia, J.; Zhu, F.; Zhao, X.; Liu, J.; Liu, H.; Yuan, G.; Sun, Q.; Xie, L.; Jin, M.; Chen, L.; Wang, Y.; Liu, Y.; Song, T. Optical properties and possible origins of atmospheric aerosols over LHAASO in the eastern margin of Tibetan Plateau. Preprints 2024, 2024031206. https://doi.org/10.20944/preprints202403.1206.v1

Abstract

The accuracy of cosmic ray observation by the Large High Altitude Air Shower Observatory Wide Field-of-view Cherenkov/fluorescence Telescope Array (LHAASO-WFCTA) is influenced by variations in aerosols in the atmosphere. The solar photometer (CE318-T) is extensively utilized within the Aerosol Robotic Network as a highly precise and reliable instrument for aerosol measurements. With this CE318-T 23, 254 sets of valid data samples in 394 days from October 2020 to October 2022 at the LHAASO site were obtained. Data analysis revealed that the baseline Aerosol Optical Depth (AOD) and A˚ngstro¨m Exponent (AE) at 440-870 nm (AE440−870nm) of the aerosols were calculated to be 0.03 and 1.07, respectively, suggesting that the LHAASO site is among the most pristine regions on Earth. The seasonality of the mean AOD are the order of spring > summer > autumn = winter. The monthly average maximum of AOD440nm occurred in April (0.11 ± 0.05) and the minimum was in December (0.03 ± 0.01). The monthly average of AE440−870nm exhibited slight variations. The seasonal characterization of aerosol types indicated that clean continental background aerosol predominated in autumn and winter, which is the optimal period for the absolute calibration of the WFCTA. Additionally, the diurnal daytime variations of AOD and AE across the four seasons are presented. Our analysis also indicates that the potential origins of aerosol over the LHAASO in four seasons were different and the atmospheric aerosols with higher AOD probably originate mainly from Northern Myanmar and Northeast India region. These results provide a baseline for comparison to the future on-site measurement of extinction coefficient profile and aerosol phase function by LHAASO-WFCTA, also enrich the valuable materials on aerosol observation in the Hengduan Mountains and Tibetan Plateau.

Keywords

Aerosol Optical Depth (AOD); sun photometer; aerosol optical properties; aerosol potential origin )

Subject

Environmental and Earth Sciences, Atmospheric Science and Meteorology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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