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On the appearance of inertia-gravity waves on the north-easterly side of an anticyclone

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Abstract:

The appearance of inertia-gravity waves over Northern Germany between the 17 and the 19 December 1999 is investigated. During this period a diffluent region downstream of the jet and north-eastwards of an anticyclone occurs in connection with the second phase of a poleward Rossby wave breaking event over the North Atlantic European region. A series of 3-hourly radiosonde ascents and a permanent measuring VHF-radar are used to examine the properties of inertia-gravity waves. The diagnostic results based on a linear theory show a characteristic horizontal wavelength of about 890 km and a vertical wavelength of about 2–3 km in the stratosphere and about 3.3 km in the troposphere. The inertia-gravity waves were amplified downstream of the jet. The phase propagation was upstream with an oscillation period of about 12.5 hr, but the energy propagation was upward in the stratosphere and downward in the troposphere with an energy source in the tropopause region. The inertia-gravity waves propagated through the middle stratosphere because strong zonal winds occurred over the whole altitude region due to the location on the edge of the polar vortex.



Das Auftreten von Tra¨gheitsschwerewellen u¨ber Norddeutschland vom 17.–19. Dezember 1999 wurde untersucht. Wa¨hrend dieser Periode existierte auf der nordo¨stlichen Seite einer Antizyklone ein diffluenter Bereich stromabwa¨rts vom Strahlstrom in Verbindung mit der 2. Phase einer polwa¨rts brechenden Rossby-Welle u¨ber der Nordatlantik-Europa Region. Eine Serie von 3-stu¨ndlichen Radiosondenaufstiegen und ein kontinuierlich messendes VHF-Radar wurden benutzt, um die Eigenschaften von Tra¨gheitsschwerewellen zu bestimmen. Eine Auswertung basierend auf einer linearen Theorie ergab eine typische horizontale Wellenla¨nge von 890 km und eine vertikale Wellenla¨nge von etwa 2–3 km in der Stratospha¨re sowie etwa 3,3 km in der Tropospha¨re. Die Tra¨gheitsschwerewellen versta¨rkten sich stromabwa¨rts vom Strahlstrom. Die beobachtete Phasenausbreitung war stromaufwa¨rts mit einer Schwingungsperiode von etwa 12,5 h, aber die Energieausbreitung war aufwa¨rts in der Stratospha¨re und abwa¨rts in der Tropospha¨re mit einer Energiequelle im Tropopausenbereich. Die Tra¨gheitsschwerewellen breiteten sich durch die mittlere Stratospha¨re aus, weil starke Zonalwinde u¨ber dem gesamten Ho¨henbereich durch die Lage am Rand des Polarwirbels auftraten.

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Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2003/0012-0025

Publication date: January 1, 2003

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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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