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Long-term changes of air temperature within a pine forest as compared to those above a grass surface

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We have analysed time series covering 30 years (1974–2003) of air temperature observations in the stand of the Hartheim pine forest (South-west Germany): daily mean values, daily maxima and minima and the diurnal range. These data, in form of monthly averages, are compared with the air temperature measurements of the Eschbach site (Deutscher Wetterdienst), which is situated in open country nearby. We discuss the differences between these two sites with particular reference to the development of the pine stand (tree height and stand density). The greatest influence upon the temperature development at both sites is that produced by oscillations of the weather. The respective curves generally run parallel to one another. The weather fluctuations are represented by the monthly mean wind at the 500 hPa level. The temperature properties of both sites Hartheim and Eschbach considered here converged during the 30-year period of observation, so that today they no longer present any notable differences.

Es werden die 30jährigen Lufttemperaturmessungen (1974–2003) im Bestand des Hartheimer Kiefernwaldes (Südwestdeutschland) analysiert am Beispiel der Tagesmittelwerte, der täglichen Maxima und Minima und der Temperaturtagesschwankung. Diese Daten werden als Monatsmittel präsentiert. Sie werden mit den Lufttemperaturmessungen an der nahegelegenen Freilandstation Eschbach des Deutschen Wetterdienstes verglichen und die Unterschiede im Zusammenhang mit der Bestandesentwicklung (Baumhöhe und Bestandsdichte) des Kiefernwaldes diskutiert. Den größten Einfluss auf die Temperaturentwicklung beider Standorte üben die Witterungsschwankungen aus. Die jeweiligen Kurven laufen im allgemeinen parallel. Die Witterungsschwankungen werden durch das Monatsmittel des Windes im 500 hPa-Niveau wiedergegeben. Alle angesprochenen Temperaturmerkmale der beiden Standorte Hartheim und Eschbach haben sich in der 30jährigen Entwicklung angeglichen, so dass heute keine bemerkenswerten Unterschiede mehr bestehen.
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Document Type: Research Article

Publication date: 2007-06-01

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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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