Extinction coefficients of surface atmospheric aerosol above LHAASO *

Pi, Wen-Xuan; Huang, Min; Zhu, F. R.; He, Y.; Xie, Ning; Zhang, Yong; Chen, Qihui; Jia, H. Y.

doi:10.1088/1674-1137/43/8/085001

Cited by 7 publications

(5 citation statements)

References 20 publications

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“…The absorption and scattering of air molecule is described using the US Standard Atmosphere Model in the simulation. The scattering model for air molecules uses the Rayleigh scattering curve, while the scattering model for aerosols uses the Elbert model and the Longtin model under different wind speeds [18,19]. Fig.…”

Section: Pos(icrc2023)494mentioning

confidence: 99%

The end-to-end Calibration of LHAASO-WFCTA based on Nitrogen Laser System

Sun¹,

Min²,

Liu³

et al. 2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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The Wide Field-of-view Cherenkov Telescope Array (WFCTA) of Large High Altitude Air Shower Observatory (LHAASO) is designed to perform nearly calorimetric measurements of extensive air showers induced by cosmic rays with energies between 10 13 eV -10 18 eV. In order to achieve an end-to-end calibration of WFCTA and investigate properties of the atmospheric aerosol, five laser systems have been operated at LHAASO, including 3 nitrogen and 2 Nd:YAG laser devices. This work presents an overview of the laser signals received by the telescope and the monitoring of geometric information related to nitrogen laser events. Additionally, it introduces the simulation method for the LHAASO-WFCTA laser calibration system. Through prolonged and stable operation, a substantial amount of data has been accumulated, requiring further data analysis for the calibration of the telescope's absolute gain and measurement of aerosol extinction coefficients.

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Section: Pos(icrc2023)494mentioning

confidence: 99%

The end-to-end Calibration of LHAASO-WFCTA based on Nitrogen Laser System

Sun¹,

Min²,

Liu³

et al. 2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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“…Additionally, the CE-318 at Litang was installed at an urban station, whereas LHAASO is located in a field less impacted by human activities, offering a more accurate representation of atmospheric background aerosol properties in the Hengduan Mountains and the TP [12]. At LHAASO, the extinction coefficients of surface atmospheric aerosols, derived from CALIPSO data and the Longtin model, were reported in our previous work in 2019 [13]. In 2023, we investigated the mean atmospheric boundary layer height, correlating it with atmospheric aerosols [14].…”

Section: Introductionmentioning

confidence: 99%

Optical Properties and Possible Origins of Atmospheric Aerosols over LHAASO in the Eastern Margin of the Tibetan Plateau

Xia,

Zhu,

Zhao

et al. 2024

Remote Sensing

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The accuracy of cosmic ray observations 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 over 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 Ångström 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 is in 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 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 regions. These results are presented for the first time, providing a detailed analysis of aerosol seasonality and origins, which have not been thoroughly documented before in this region, also enriching the valuable materials on aerosol observation in the Hengduan Mountains and Tibetan Plateau.

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“…Thus, the calibration for WFCTA is crucial to the accuracy of the energy of the measured cosmic ray [5]. However, the distribution of the aerosol in the field of the telescope will give a challenge for the measurement by scattering the Cherenkov light with complicated function [6]. In the field of laser calibration, an end-to-end approach is adopted in Auger to measure the aerosol attenuation [7,8].…”

Section: Introductionmentioning

confidence: 99%