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Proceedings Paper

Simultaneous observation of temporal and spatial distribution of atmospheric aerosol by means of slant-path and plan position indicator lidars
Author(s): Jamrud Aminuddin; Naohiro Manago; Nofel Lagrosas; Shin'ichiro Okude; Hiroaki Kuze
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Paper Abstract

The influence of aerosols to the atmosphere has been discussed in the context of the Earth radiation budget and global climate change. Therefore, precise monitoring of aerosol parameters is important for better understanding of their real characteristics and impacts on the environment. In this study, we report on a novel method of concurrent measurements of aerosol near the surface level by means of slant-path (SP) and plan position indicator (PPI) lidars. The SP lidar utilizes a diode-laser-pumped Nd:YAG laser operating at 532 nm, while the PPI is based on a Nd:YLF laser at 349 nm. The PPI system including the laser transmitter and telescope section is rotated over 360° for covering all the horizontal directions with the maximum observation range up to around 3 km. At the same time, the SP lidar is employed for monitoring the near surface region that cannot be covered by vertical observation lidars. Furthermore, the backscattered signals recorded by both PPI and SP lidars are analyzed using the Fernald method to retrieve aerosol extinction coefficient by employing lidar ratios for 349 and 532 nm. These values of lidar ratio are estimated by adjusting and fitting parameters in the Mie scattering calculation (mode radius, variance, and both real and imaginary parts of refractive index) to real data from ground-based sampling instruments, namely, the scattering coefficient, absorption coefficient, and size distribution observed with an integrating nephelometer, an aethalometer, and an optical particle counter, respectively. Real-time values of the extinction coefficient inside the atmospheric boundary-layer are derived as the summation of scattering and absorption coefficients. The results are then compared with those from a vertical lidar, operated by the National Institute of Environmental Studies (NIES) on the campus of Chiba University. We discuss the observed features of aerosol characteristics that vary both temporally and spatially.

Paper Details

Date Published: 24 October 2018
PDF: 9 pages
Proc. SPIE 10779, Lidar Remote Sensing for Environmental Monitoring XVI, 107790F (24 October 2018); doi: 10.1117/12.2324688
Show Author Affiliations
Jamrud Aminuddin, Chiba Univ. (Japan)
Univ. Jenderal Soedirman (Indonesia)
Naohiro Manago, Chiba Univ. (Japan)
Nofel Lagrosas, Chiba Univ. (Japan)
Shin'ichiro Okude, Chiba Univ. (Japan)
Hiroaki Kuze, Chiba Univ. (Japan)

Published in SPIE Proceedings Vol. 10779:
Lidar Remote Sensing for Environmental Monitoring XVI
Upendra N. Singh; Nobuo Sugimoto, Editor(s)

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