Raman lidar and in-situ aircraft measurements of free tropospheric aerosol particles over Japan

Tetsu Sakai; Takashi Shibata; Keichiro Hara; Mizuka Kido; Kazuo Osada; Masahiko Hayashi; Katsuji Matsunaga; Yasunobu Iwasaka

doi:10.1117/12.417091

13 February 2001 Raman lidar and in-situ aircraft measurements of free tropospheric aerosol particles over Japan

Tetsu Sakai, Takashi Shibata, Keichiro Hara, Mizuka Kido, Kazuo Osada, Masahiko Hayashi, Katsuji Matsunaga, Yasunobu Iwasaka

Author Affiliations +

Proceedings Volume 4153, Lidar Remote Sensing for Industry and Environment Monitoring; (2001) https://doi.org/10.1117/12.417091
Event: Second International Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 2000, Sendai, Japan

Abstract

A comparative measurement of the free tropospheric aerosol particles using a ground-based Raman lidar and in-situ sampling instruments on board an aircraft was made over central part of Japan (35-36?N, 136-137?E) in the Asian dust period on April 23, 1996. We compared the aerosol properties measured with the lidar (aerosol backscattering coefficients and the depolarization ratio at the wavelength of 532 nm) and those obtained with the aircraft-based instruments (aerosol shape and surface feature, number size distribution, and chemical composition). The aerosol backscattering coefficients calculated from the aerosol size distribution obtained with the airborne optical particle counters (OPCs) showed good agreements (mean relative difference of 22%) with those measured with the lidar above the altitude of 3.1 km and showed large difference (mean relative of 50%) below 3.1 km. The aerosol depolarization ratios correlated well with the fractions of the backscattering coefficient of the coarse mode particles (radius>0.5 ?m) in the total aerosol backscattering coefficient calculated from the OPCs data above 3.4 km. This suggests that the coarse mode particles that considered mainly of nonspherical mineral dust particles predominantly contributed the depolarized signals in this altitude region. The aerosol depolarization ration of the coarse mode particles was estimated to be 16?4% at 5.3 km.

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Tetsu Sakai, Takashi Shibata, Keichiro Hara, Mizuka Kido, Kazuo Osada, Masahiko Hayashi, Katsuji Matsunaga, and Yasunobu Iwasaka "Raman lidar and in-situ aircraft measurements of free tropospheric aerosol particles over Japan", Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); https://doi.org/10.1117/12.417091

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