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Observations of the atmospheric surface layer parameters during the total solar eclipse of March 29th, in Greece

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Abstract:

This study examines the effect of the total solar eclipse of March 29 2006, on some parameters of the atmospheric surface layer. The eclipse effects on the mean, but also turbulent parameters of the wind were studied at Kastelorizo, a small island of southeastern Greece situated within the totality path of the eclipse. Although the eclipse effect on the mean flow was partly masked by the synoptic situation, the analysis of the intensive (high frequency) wind measurements showed a decrease of the turbulent processes with reduced values of the turbulent kinetic energy and shear stress for a short period around the maximum phase of the eclipse. The buoyancy flux decreased by one order of magnitude during the phenomenon. The power spectra of the three wind components were found to be lower by almost one order of magnitude near the total phase when compared to spectra after the end of the eclipse.

German
Diese Studie untersucht die Auswirkungen der totalen Sonnenfinsternis am 29. März 2006 auf verschiedene dynamische Parameter innerhalb der atmosphärischen Grenzschicht. Gegenstand der Untersuchungen sind Windmessungen am Standort Kastelorizo. Diese kleine Insel im Südosten von Griechenland lag unmittelbar im Kernschatten der Finsternis. Obwohl der Einfluss auf die mittlere Luftströmung durch die vorherrschende synoptische Situation verdeckt wurde, ermöglichte die Analyse der hochfrequenten Bestandteile die Beobachtung einer Abnahme von turbulenten Prozessen mit kleineren Werten für turbulente kinetische Energie sowie Scherspannung für einen kurzen Zeitraum während des maximalen Bedeckungsgrads der Sonne. Das Leistungsspektrum der drei Windkomponenten war zu dieser Zeit etwa eine Größenordnung kleiner im Vergleich zu den Spektren nach Ende der Finsternis.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2009/0406

Publication date: October 1, 2009

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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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