Experimental determination of the effect of mountain-valley breeze circulation on air pollution in the vicinity of Freiburg |
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| Institution: | 1. Climatology and Environmental Meteorology, Institute of Geoecology, Technische Universität Braunschweig, Langer Kamp 19c, 38106 Braunschweig, Germany;2. German Meteorological Service, Frankfurter Straße 135, 63067 Offenbach, Germany;1. Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China;2. Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC), Nanjing University of Information Science & Technology, Nanjing 210044, China;3. Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;4. Shaanxi Meteorological Service Center of Agricultural Remote Sensing and Economic Crops, Xi''an 710014, China;5. Institute of Eco-Chongming (IEC), Shanghai 200062, China |
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| Abstract: | Tethersonde and airship measurements were carried out in 1994 during two different seasons within the framework of the preparation of the Clean Air Plan of Freiburg. These investigations concerned the influence of the Freiburg mountain-valley wind system, the so-called Höllentäler, on Freiburg's air quality. Vertical and horizontal measurements carried out east of Freiburg in the Dreisam Valley revealed that when the mountain-valley wind system has developed during summer high-pressure weather conditions, Freiburg is supplied with low polluted air masses from the Black Forest at night up to the early morning hours. Conversely, it may occur that during stable weather conditions with low wind speeds, the polluted air masses which flow into the Black Forest during the day are transported back to Freiburg with the mountain wind, so that there is no fresh air supply. |
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