Seasonal dependence of the long-range transport and vertical distribution of free tropospheric aerosols over east Asia: On the basis of aircraft and lidar measurements and isentropic trajectory analysis

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Read Full Article (file size: 819102 bytes) Cited by JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 108, NO. D23, 8663, doi:10.1029/2002JD003266, 2003 Seasonal dependence of the long-range transport and vertical distribution of free tropospheric aerosols over east Asia: On the basis of aircraft and lidar measurements and isentropic trajectory analysis Atsushi Matsuki Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan Yasunobu Iwasaka Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan Kazuo Osada Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan Katsuji Matsunaga Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan Mizuka Kido Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan Yayoi Inomata Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan Dmitri Trochkine Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan Chiharu Nishita Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan Takayoshi Nezuka Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan Tetsu Sakai Japan Science and Technology Corporation, Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan Daizhou Zhang Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, Kumamoto, Japan Soung-An Kwon Environmental Technology Center, National Institute of Environmental Research, Seoul, Republic of Korea Abstract Seasonal changes in the vertical structure of free tropospheric aerosols over east Asia, on the basis of aircraft-borne and lidar measurements, and on the pathway of the long-range transport of Asian dust particles inferred from isentropic trajectory analysis are discussed. Aircraft-borne measurements held in situ in the free troposphere over central Japan in 2000–2001 revealed a small in scale yet steady transport of dust in the lower-middle free troposphere (2–6 km altitude) during spring including days with no evident dust outbreak. Such dust, found as background, was observed even in summer in the regions higher than 4 km under the influence of remaining westerly winds but not in the lower regions. From a series of lidar observations over Nagoya (35°N, 137°E), Japan, noticeable changes in aerosol characteristics were obtained in the free troposphere from spring to summer. Taklimakan desert is suggested as possible important source of the background dust. Received 1 December 2002; accepted 18 April 2003; published 13 August 2003. Index Terms: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801); 0368 Atmospheric Composition and Structure: Troposphere—constituent transport and chemistry; 0322 Atmospheric Composition and Structure: Constituent sources and sinks; 0312 Atmospheric Composition and Structure: Air/sea constituent fluxes (3339, 4504); 0320 Atmospheric Composition and Structure: Cloud physics and chemistry. Read Full Article (file size: 819102 bytes) Cited by Citation: Matsuki, A., et al. (2003), Seasonal dependence of the long-range transport and vertical distribution of free tropospheric aerosols over east Asia: On the basis of aircraft and lidar measurements and isentropic trajectory analysis, J. Geophys. Res., 108(D23), 8663, doi:10.1029/2002JD003266. Copyright 2003 by the American Geophysical Union.

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