Terrain-induced air stagnation over the southern Kanto Plain in early winter |
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| Authors: | H Yoshikado T Mizuno S Shimogata |
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| Institution: | (1) National Institute for Resources and Environment, 16-3 Onogawa, 305 Tsukuba, Ibaraki, Japan |
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| Abstract: | In the southern Kanto Plain of Japan including Tokyo, the highest air pollution concentrations occur under stagnant conditions in early winter. A series of 3-dimensional observations of these episodes have been performed since 1989, three of which are analysed in this note. In every case, a surface of discontinuity covers the stagnant region, the height of which is several hundred meters, even during the daytime. A terrain-induced local front (LF) provides this structure, but in one case a synoptic-scale stationary front acts in its place.A much warmer and cleaner southwesterly flow prevails on the southern side of the LF. However, upper measurements at a mountainous site indicate that the southwesterly winds entrain pollutants from the lower stagnant layer due to very large vertical wind shear. |
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