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First results of the urban climate analysis of Ljubljana

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Abstract:

Currently an urban climate analysis is performed in the basin of Ljubljana (capital of Slovenia), and the results will be used for the revision of the zoning plan. The observations reflect a high frequency of inversion layers, whereby in the surroundings of the city the frequency is higher than in the city centre. In addition low wind speeds are also quite frequent, especially in wintertime, which results in bad dispersion conditions for pollutants in that region. A further objective of that study is the description of a particular local wind system, with a flow directed towards the city centre during the night. The corresponding backward flow at higher levels above the city (approx. 130 m) was observed by means of a SODAR device. In the city planning map suggestions were made concerning areas for living and small business, taking into account the findings of the climatological analysis. Here, the first important results are discussed. The analysis will be finished by 2001, and it is planned to publish the final results.

Im Becken von Ljubljana wurde eine Stadtklimaanlanalyse durchgefu¨hrt, deren Ergebnisse fu¨r die U¨berarbeitung des Fla¨chenwidmungsplanes herangezogen werden. Die Messdaten zeigen, dass Ljubljana eine relativ hohe Inversionsgefa¨hrdung aufweist, wobei im Zentrum abgehobene Inversionen deutlich ha¨ufiger sind als im Umland. Hinzu kommt noch im Winterhalbjahr eine ausgepa¨gte Windarmut, wodurch ausgesprochen ungu¨nstige Ausbreitungsbedingungen fu¨r Luftschadstoffe vorherrschen. In der Arbeit wird ferner die Besonderheit eines lokalen zum Zentrum gerichteten Windsystems beschrieben, wobei mittels SODAR auch eine Ru¨ckfu¨hrung der Stro¨mung in der Ho¨he (oberhalb ca. 130 m u¨ber Grund) in die entgegengesetzte Richtung erfasst wurde. In Hinblick auf die Planung wurden in Abstimmung mit den klimatologischen Aspekten in der Karte der planerischen Hinweise Wohn- und Gewerbegebiete vorgeschlagen

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Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2001/0010-0273

Publication date: July 1, 2001

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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