研究简报
王景书,余秀芬,陈竹舟.太原市大气扩散示踪试验[J].环境科学学报,1989,9(1):100-104
太原市大气扩散示踪试验
- AN INVESTIGATION ON ATMOSPHERIC DIFFUSION USING TRACER IN TAlYUAN AREA
- 摘要：太原市位于山西中部,东、西两山夹峙,汾河南北中贯,地形北部较高,南部开放,西部有一缺口,是一个封闭不完全的盆地。风速较小,1971-1980年平均风速为2.5m/s,静风频率为24％。在无系统天气过境时,近地层气象十分复杂,城南和城北、河东和河西的地面风往往不同。 近年来,太原市大气污染日趋严重,我们于1985年10-11月在太原地区进行了大气扩散示踪试验,以期能对该地区大气污染物的输送和扩散有所了解。
- Abstract：Dual-tracer experiments using SF8 and F1211 (CF2ClBr) were conduc-ted from October to November, 1985 in Taiyuan area to examine the atmospheric diffusion characteristics. The tracers were released from the tops of two 100m stacks and the samples were then collected both on ground-level (20km from the stacks) and in the air using balloons and airplane. The samples were analyzed by cooling concentrate chromato-graph with a detection limits of 10-13 for SF6 and 10-11 for F1211 respectively. The values of diffusion parameters σv and σz for 100m releasing height and σv for 50m releasing height under neutral stability condition were determined and the normalized concentration on ground level were given. The calculated σv value is close to that of Briggs's while the σz is lower.
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