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Orographic gravity waves induced by variable mean winds: observations at Hofsjökull

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Surface pressure and wind observations have been collected at 19 stations spread over the glaciated mountain Hofsjökull during the campaign FLOHOF in summer 2007 in order to explore gravity wave activity due to mean flow variations in time. Hofsjökull has an almost circular shape and, in general, fairly soft slopes so that it make senses to compare simple linear steady responses to the observations in order to detect transient features. This intercomparison is performed for various covariance functions of station pressures and mean winds. There is reasonably good agreement of observations and theory at stations near the edge of the ice dome but less so at those located higher up. The relation of the meridional mountain drag and the mean flow is described quite well by the linear theory. The collected data are exposed to a POP-analysis which yields oscillatory modes with the periods of a day and more. An analysis of pressure extrema at single stations reveals that local oscillations with periods of 2-3 hrs are quite common.

Im Sommer 2007 wurden Bodendruck und Bodenwind an 19 Stationen auf und nahe dem vergletscherten Hofsjökull in Island gemessen um etwas über orographische Schwerewellen bei wechselnden Winden zu erfahren. Dieser Berg ist nahezu kreisrund und seine Abhänge sind meist sanft geneigt, so dass es sinnwoll ist, die Resultate linearer Theorien stationärer Zustände mit Beobachtungen zu vergleichen, um so zeitabhängige Phänomene zu entdecken. Der Vergleich wird für Korrelationen der Stationsdrücke mit dem mittleren Wind durchgeführt. Die Übereinstimmung von Theorie und Beobachtung ist für Stationen am Rande der Gletschers befriedigend, weniger für solche in der Höhe. Die lineare Theorie beschreibt den Zusammenhang von meridionalem Bergwiderstand und mittlerem Wind recht gut. Eine POP-Analyse findet für die Druckmessungen Schwingungen mit Perioden von einem Tag und mehr. Eine Untersuchung für einzelne Stationen ergibt Perioden von 2–3 Stunden.

Document Type: Research Article


Publication date: February 1, 2010

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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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