Characterization of Aeolian Dust in East China and Japan from 2001 to 2003(<Special Issue>ADEC-Aeolian Dust Experiment on Climate Impact-)

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概要

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• In order to elucidate the variation and characterization of dust particles that originate in the arid and semi-arid regions of inland Asia and are transported to Japan, we established a sampling network system in east China and Japan and collected aeolian dust under the Japan-China joint project "ADEC". Monitoring of the total suspended particle (TSP) and size-segregated dust concentrations were carried out in Beijing, Qingdao and Hefei in China, and Fukuoka, Nagoya, Tsukuba and Naha in Japan. The seasonal variations showed the general trend that the aerosol concentration was high in spring and low in summer, though it sometimes became high in winter in Qingdao. The aerosol size distribution was bimodal. One peak at around 0.5μm diameter corresponds to particles of anthropogenic origin, in which the main components are black carbon, NH_4^+ and SO_4^<2->, and some elements such as Pb, Cd, Sn, Sb and Bi are abundant. The other peak at around 4-5μm diameter corresponds to mineral dust of soil origin, in which the main soluble components are Na^+, Ca^<2+>, NO_3^- and Cl^-. The coarser particles increased when a dust event occurred. The IOP program was conducted in the spring of 2002 (IOP-1) and 2003 (IOP-2). The dust concentration during IOP-1 was high in China, particularly in Beijing. The average dust concentration during a dust event decreased in the order of Beijing>Qingdao>Hefei and Beijing>Fukuoka>Nagoya>Tsukuba>Naha. However, there were few observable dust events during IOP-2. From the results of continuous monitoring, the dust concentration during periods without dust events seemed to be almost equal at all monitoring locations in Japan. This suggests that the segregation of dust occurs in China and fine dust particles are transported to Japan. Seasonal variations of TSP, PM_<11> (particulate size is less than 11μm), PM_<2.1> (less than 2.1μm) and mineral matter (larger than 2.1μm) contents were studied. It was shown that these values decrease with distance from the source area.

• 2005-03-31

著者

• Hayashi Masahiko

  Fukuoka Univ.

• Kai K

  Nagoya Univ. Nagoya Jpn

• OHTA ATSUYUKI

  Geological Survey of Japan, AIST

• KANAI YUTAKA

  Geological Survey of Japan, AIST

• ZHANG RENJIAN

  Institute of Atmospheric Physics, Chinese Academy of Sciences

• TERASHIMA SHIGERU

  Geological Survey of Japan, AIST

• IMAI NOBORU

  Geological Survey of Japan, AIST

• Kai Kenji

  Nagoya University

• KAMIOKA Hikari

  Geological Survey of Japan

• Hayashi Masahiko

  Fukuoka University

• Imai Noboru

  Geological Survey Of Japan Aist

• Imai Noboru

  Geological Surevey Of Japan

• Kanai Yutaka

  Geological Survey Of Japan Aist

• Ohta Atsuyuki

  Geological Survey Of Japan Aist

• Ohta A

  Nagoya Univ. Nagoya Jpn

• Ohta Atsuyuki

  Department Of Earth And Planetary Sciences Graduate School Of Environmental Studies Nagoya Universit

• Ohta Atsuyuki

  Geological Survey Of Japan Advanced Institute Of Science And Technology (aist)

• Zhang Renjian

  Institute Of Atmospheric Physics Chinese Academy Of Sciences

• Kamioka Hikari

  Geological Survey Of Japan (gsj) National Institute Of Advanced Industrial Science And Technology (a

• KANAI Michiyo

  Geological Survey of Japan (GSJ), National Institute of Advanced Industrial Science and Technology (

• SHIMIZU Hiroshi

  Hiroshima University

• TAKAHASHI Yoshio

  Hiroshima University

• SHENG Lifang

  Institute of Physical Oceanography, Ocean University of China

• Sheng Lifang

  Institute Of Physical Oceanography Ocean University Of China

• Kanai Michiyo

  Geological Survey Of Japan (gsj) National Institute Of Advanced Industrial Science And Technology (a

• Ohta A

  Geological Survey Of Japan Aist

• Takahashi Yoshio

  Graduate School Of Science Hiroshima University

• Terashima Shigeru

  Geological Survey Of Japan Aist

• Terashima Shigeru

  Geological Survey Of Japan

• Takahashi Yoshio

  Hiroshima Univ. Hiroshima Jpn

• KANAI Yutaka

  Geological Survey of Janpan (National Instiute of Advanced Industrial Science and Technology)

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