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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Influence of valley winds on transport and dispersion of airborne pollutants in the Freiburg-Schauinsland area
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Influence of valley winds on transport and dispersion of airborne pollutants in the Freiburg-Schauinsland area

机译：谷风对弗赖堡-朔伊斯兰德地区空气污染物的迁移和扩散的影响

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摘要

The change of the concentration of trace gases in a natural environment depends on both chemical and meteorological conditions. To quantify the contribution of meteorological processes, such as transport and dispersion, chemical and meteorological processes must be assessed separately. In June 1996 the Schauinsland Ozone Precursor Experiment (SLOPE) was carried out to investigate the behavior of ozone and its precursors as a function of time in a valley between Freiburg in the Rhine Valley and Schauinsland in the Black Forest [Volz-Thomas et nl., this issue]. The main purpose of this contribution is to calculate the influence of transport and dispersion on the change of the concentration of airborne pollutants in a propagating air mass. Therefore (1) an inert tracer, SF6, was released, and (2) meteorological measurements were performed to investigate the valley wind regimes and the evolution of the mixed layer. Here are the main results of the experiment: Clear-sky conditions caused upvalley winds to be generated in the various valleys in the morning. These upvalley winds led to the transport of polluted air and SF6 from Freiburg through the Zarten Basin and the side valley (GroBes Tal) up to the Schauinsland hill. The propagation through the GroBes Tal took 90 +/- 5 min, which gives a propagation rate of approximately 1.3 m s(-1). The dilution factor for SF6 between the entrance and the outlet of the valley was approximately 9. This dilution factor could not only be explained by the continuous growth of the boundary layer during the propagation time of the tracer from the entrance to the outlet of the valley, but additionally by flow splitting and mountain venting [Fiedler et al., this issue]. [References: 34]
机译：自然环境中痕量气体浓度的变化取决于化学和气象条件。为了量化气象过程（例如运输和分散）的贡献，必须分别评估化学和气象过程。 1996年6月，进行了Schauinsland臭氧前体实验（SLOPE），以研究莱茵河弗莱堡和黑森林Schauinsland之间的山谷中臭氧及其前体的行为随时间的变化[Volz-Thomas等。 ， 这个问题]。该贡献的主要目的是计算传播和扩散对传播的空气质量中空气污染物浓度变化的影响。因此，（1）释放了惰性示踪剂SF6，（2）进行了气象测量，以调查谷风和混合层的演变。这是实验的主要结果：晴朗的天空条件导致早晨在各个山谷中产生上风。这些强风吹袭导致污染的空气和SF6从弗赖堡经过Zarten盆地和侧谷（GroBes Tal）到达Schauinsland山。通过GroBes Tal的传播花费了90 +/- 5分钟，这给出了大约1.3 m s（-1）的传播速率。谷的入口和出口之间的SF6稀释因子约为9。该稀释因子不仅可以用示踪剂从谷的入口到出口的传播时间内边界层的连续增长来解释。 ，但另外通过分流和山区通风[Fiedler等人，此问题]。 [参考：34]

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