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| Structures and characteristics of the atmospheric boundary layer in winter of the Tianjin suburb |
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Abstract Based on the observation data that have been obtained, the vertically characteristic of wind field and temperature field in winter of Tianjin city have been studied. The results showed that, during the testing time, the direction of wind as the height increased a clockwise rotation, by East, Southeast gradually turn right, turn to the southwest wind, west wind, following the Eckman spiral pattern; different height level wind changed in the appearance of different laws daily. In general, at low height the wind speed was bigger at the day than the night, but at the more height was contrast; the grounding inverse temperature generated about 20:00. With increasing of the time the inverse temperature enhanced, and on the 02:00 of the second day, the inverse temperature were the most; the height of the mixed boundary was thinner in the early morning, thicker in the afternoon, which was beneficial to the spread of pollutants. The daily variation of the wind speed were the same between the urban and the suburban of the same height at 10m and 100m; but it was different at the 200m; the urban wind speed fluctuation was smaller than the suburb with time daily.
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Received: 18 February 2012
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