Terrain-induced air stagnation over the southern Kanto Plain in early winter

Details Terrain-induced air stagnation over the southern Kanto Plain in early winter Terrain-induced air stagnation over the southern Kanto Plain in early winter

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994bolme..68..159y&link_type=abstract

Boundary-Layer Meteorology, Volume 68, Issue 1-2, pp. 159-172

Physics

3

Scientific paper

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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