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Instantaneous fluctuations of temperature and moisture in the upper troposphere and tropopause region. Part 1: Probability densities and their variability

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Using nine years (1995–2003) of MOZAIC temperature and humidity data, we analyse the statistics of instantaneous fluctuations of temperature, relative and absolute humidity with various spatial resolutions. We determine the probability density functions (p.d.f.s), their low order moments up to kurtosis, and study how these quantities vary with spatial resolution and with the background mean relative humidity. Seasonal and geographical variations are considered. Bivariate distributions of joint fluctuations of temperature and relative humidity are presented as well. These investigations are thought to provide an observational basis for the validation of statistical cloud schemes for large-scale models. For instance, we can show that temperature fluctuations cannot be neglected in such a scheme and that the bivariate distributions of simultaneous fluctuations of temperature and humidity have to be taken into account.

Instantane Fluktuationen von Temperatur und relativer Feuchte auf verschiedenen räumlichen Skalen werden mit Hilfe von MOZAIC Daten aus neun Jahren (1995–2003) untersucht. Wahrscheinlichkeitsdichteverteilungen werden bestimmt, deren Momente bis zur vierten Ordnung (d.h. Varianz, Schiefe, und Wölbungsmaß), sowie die Abhängigkeit dieser Größen von der räumlichen Auflösung und der mittleren relativen Feuchte. Saisonale und geographische Unterschiede werden betrachtet. Bivariate Verteilungen gemeinsamer Fluktuationen von Temperatur und relativer Feuchte werden ebenfalls präsentiert. Diese Untersuchung soll die Datengrundlage für Validationszwecke von statistischen Wolkenschemata für groß-skalige Modelle liefern. Wir zeigen beispielsweise, dass in einem solchen Schema Temperaturfluktuationen nicht vernachlässigt werden können, und dass man die bivariaten Verteilungen gleichzeitiger Fluktuationen von Temperatur und Feuchte verwenden muss.
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Document Type: Research Article

Publication date: 2007-04-01

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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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