Aerosol optical characteristics in the yellow sand events observed in May, 1982 in Nagasaki : Part 1 Observations.
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概要
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Optical thicknesses and volume spectra of aerosols were retrieved from spectral extinction and aureole measurements for the yellow sand events observed during 4-8 May 1982 at Nagasaki, Japan. The results showed a dominance of large particles of several micron radius and a reduction of submicron particles. The mode radius of the column volume spectrum obtained with the aureolemeter was larger than two microns during the yellow sand events. The aerosol optical thickness at a wavelength of 0.5μm and the Angstrom's exponent α took values of 0.5-1.0 and 0.1-0.5 in contrast with their normal values of 0.2-0.8 and 0.8-1.5, respectively. Trajectory analyses from the synoptic charts as well as the elemental composition, the number density and the scattering cross section of aerosols supported consistently the prevalence of the continental air mass associated with the frontal activity during the yellow sand events.1982年5月4日から8日にかけて長崎市において観測された黄砂現象について、太陽直達光と太陽周辺光の分光観測からエアロゾルの光学的厚さと粒径分布(体積スペクトル)を求めた。その結果、半径数ミクロンの大粒子の増大とサブミクロン粒子の減少が見出された。オーリオールメータ観測から得られた黄砂の体積スペクトルのモード半径は2*mより大きかった。平時の波長0.5*mでのエアロゾルの光学的厚さが0.2～0.8、オングストローム指数*が0.8～1.5であったのに対して、黄砂時には、各々0.5～1.0、0.1～0.5と大きく変化した。地上・高層天気図を用いた流跡線解析、およびエアゾルの元素分析、数密度、散乱断面積の観測結果は、黄砂の到来が前線の移動に伴う大陸気団の卓越によることを支持した。
- Meteorogical Society of Japan,社団法人 日本気象学会,Upper Atmosphere Research Laboratory, Tohoku University,Meteorological Research Institute,Faculty of Education, Nagasaki University,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の論文
著者
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Takata Morimasa
National Institute Of Polar Research
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Shiobara Masataka
National Institute For Polar Research
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Tanaka Masayuki
Center For Atmospheric And Oceanic Studies Faculty Of Science Tohoku University
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Shiobara M
Meteorological Res. Inst. Tsukuba Jpn
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