Kosa events are visually observed and recorded as a lithometeor by the manned meteorological stations and weather stations. They are defined as a phenomenon in which a significant volume of dust originating mainly from the Loess Plateau in the continent covers the whole sky and falls toward the ground. In an extreme case, the sky looks yellow, the sun shines dim, snow on the ground is colored and the ground is covered with dust.
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Fig. 7.2.13.1 Views of Osaka city on 21 March 2010 (courtesy of Mr Kenichi Adachi, Osaka District Meteorological Observatory). |
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Fig. 7.2.13.2 Views of Osaka city on 22 March 2010 (courtesy of Mr Kenichi Adachi, Osaka District Meteorological Observatory). |
