Application of lidar depolarization measurement in the atmospheric boundary layer: Effects of dust and sea-salt particles

Toshiyuki Murayama, Hajime Okamoto, Naoki Kaneyasu, Hiroki Kamataki, Kazuhiko Miura

研究成果: ジャーナルへの寄稿学術誌査読

156 被引用数 (Scopus)

抄録

We intensively observed the atmospheric boundary layer with a polarization lidar, a Sun photometer, and a high-volume sampler at a coastal area of Tokyo Bay. The purpose of the observation is to investigate a phenomenon discovered in the past summer: relatively high depolarization ratio events (≈10% at peak) in the lower atmosphere associated with sea breeze. From the chemical analyses of the simultaneously sampled aerosols, we found that the depolarization ratio might be related to crystallized sea salt and dust particles. A boundary structure was clearly revealed by the depolarization ratio in the lower atmosphere, which might correspond to the mixed layer (the internal boundary layer) or the sea breeze in which crystallized sea salt and/or dust particles were diffused. We also presented the first numerical calculation on the depolarization ratio of the cubic particles to apply crystallized sea-salt (NaCl) particles by the dipole discrete approximation (DDA) method: the calculation yields 8-22% of depolarization ratio for the effective size larger than 0.8 μm at the investigated wavelength (532 nm).

本文言語英語
論文番号1999JD900503
ページ(範囲)31781-31792
ページ数12
ジャーナルJournal of Geophysical Research Atmospheres
104
D24
DOI
出版ステータス出版済み - 12月 27 1999
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 林業
  • 海洋学
  • 水圏科学
  • 生態学
  • 水の科学と技術
  • 土壌科学
  • 地球化学および岩石学
  • 地表過程
  • 大気科学
  • 地球惑星科学(その他)
  • 宇宙惑星科学
  • 古生物学

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