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Semi-diurnal pressure fluctuation in the ERA40 Data

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In a regional analysis the removal of the globally present semi-diurnal pressure signal could be necessary in order to isolate the pressure signal of regional features. As soon as global reanalysis data is used an essential prerequisite is to determine the characteristic signal of this data. The semi-diurnal surface pressure fluctuations between 1958 and 2001, deduced from the ERA40 reanalysis data provided by the European Centre for Medium Range Weather Forecasts, are approximatively determined. Annual mean global structure and magnitude of the ERA40 related semi-diurnal pressure tide compare reasonably well with the structure derived from theory and other reanalysis data. However, the comparison with observed data shows regional shortcomings due to the low temporal resolution of the six-hourly ERA40 data. Along the equator the annually mean amplitude of the semi-diurnal pressure fluctuation in the ERA40 data amounts to 1.34 hPa. The seasonal values are 1.23 hPa for northern hemispheric summer and 1.39 hPa for winter.

Die halbtägig global umlaufende Druckwelle muss oft bei regionalen Analysen herausgefiltert werden, um das mit der regionalen Zirkulation verbundene, isolierte Bodendrucksignal zu erhalten. Werden globale Reanalyse Daten herangezogen, so ist es notwendig, das für diese Daten charakteristische Signal zu bestimmen. Die Amplitude der Halbtageswelle des Bodendruckes wird für die ERA40 Reanalyse Daten des European Centre for Medium Range Weather Forecasts der Periode 1958–2001 annäherungsweise bestimmt. Die globalen Jahresmittel von Struktur und Betrag der für die ERA40 Daten charakteristischen Halbtageswelle sind vergleichbar jener, wie sie sich aus Theorie und anderen Reanalyse Daten ergeben haben. Der Vergleich mit Beobachtungen zeigt jedoch regionale Mängel. Grund dafür ist die geringe zeitliche Auflösung der sechsstündigen ERA40 Daten. Für diese Daten ergibt sich entlang des Äquators eine Amplitude der mittleren jährlichen halbtägigen Bodendruckschwankungen von 1.34 hPa. Die saisonalen Werte betragen 1.23 hPa für den nordhemisphärischen Sommer und 1.39 hPa für den entsprechenden Winter.
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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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