Aerosol optical characteristics in the yellow sand events observed in May, 1982 in Nagasaki : Part 2 models.

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概要

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• Phase functions of yellow sand particles were measured by a polar nephelometer during 24 April-11 May, 1982 at Nagasaki, Japan. They suggested a strong nonsphericity of the particles, which can be reconstructed by the semi-empirical theory of Pollack and Cuzzi or by Mie particles with large fictitious absorption. Spectral extinction cross section, single scattering albedo, asymmetry factor and backscattering phase function were estimated using the volume spectra retrieved from data of several instruments including the polar nephelometer data. Volume loading of yellow sand particles at the observation site was estimated as 666l/km2 at the maximum stage of the yellow sand event of 4-6 May and 183l/km2 for the secondary maximum of 8 May. Using two estimates of the absorption index (0.01 and a model variable with wavelengths), these values show that solar radiative heating from 0.08 to 0.4°C/day can be expected in the atmosphere over considerably wide area in one yellow sand event.長崎において1982年4月24日から5月11日までポーラーネフロメータによる黄砂粒子の散乱位相関数の測定を行った。Pollack and Cuzzi　の半経験的理論によるモデルや、Mie 散乱粒子に仮想的な吸収を導入したモデルは、黄砂粒子の強い非球形性を示唆した。また、ポーラーネフロメータを含む数種の測器の観測データから得られた黄砂粒子の体積スペクトルを用いて、波長別消散断面積、単一散乱アルベド、非対称因子、後方散乱関数を求めた。観測地での黄砂粒子の体積濃度は、黄砂現象の最も強かった5月4～6日には666l/km2、続く5月8日には183l/km2と推定された。複素屈折率の虚数部として0.01および波長依存するモデル値を用いると、これらの値から計算される太陽放射加熱率は0.08～0.40*/dayに達し、1回の黄砂到来により広い範囲にわたって大きな放射効果を及ぼすことが予想された。

• Meteorogical Society of Japan,社団法人 日本気象学会,Upper Atmosphere Research Laboratory, Tohoku University,Faculty of Education, Nagasaki University,EKO Instruments Co.,東北大学理学部超高層物理学研究施設,長崎大学教育学部地学教室,英弘精機株式会社の論文

著者

• Takata Morimasa

  National Institute Of Polar Research

• Shiobara Masataka

  National Institute For Polar Research

• Tanaka Masayuki

  Center For Atmospheric And Oceanic Studies Faculty Of Science Tohoku University

• Shiobara M

  Meteorological Res. Inst. Tsukuba Jpn

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