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Free Content The BAYSOFI Campaign – Measurements carried out during the total solar eclipse of August 11, 1999

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Abstract:

The total solar eclipse of August 11, 1999 provided a unique opportunity to observe the input of fast day-night and night-day transitions, under high solar elevation around noon, on the earth-atmosphere-biosphere system. Within the interdisciplinary field campaign BAYSOFI, measurements of radiation, boundary layer micrometeorology and photochemistry, photosynthesis and transpiration were carried out at Freising-Weihenstephan and several locations nearby focusing on short-term effects of the eclipse. Although the overall grosswetterlage on August 11 was not favourable for viewing the eclipse, with clouds covering most of central Europe, observational conditions at Weihenstephan were fair due to a large hole in the cloud layer which appeared just half hour before totality lasting for more than one hour. Thus significant effects of the eclipse on radiation, photolysis rates, OH, the temperature, wind, turbulence structure and stratification, ozone and CO2 fluxes, photosynthesis, transpiration and sap flow of trees could be observed which are reported and discussed in the following sequence of papers.

Die totale Sonnenfinsternis am 11. August 1999 bot die einmalige Gelegenheit, den Einfluss schneller Tag-Nacht- und Nacht-Tag-Übergänge bei hohem mittäglichem Sonnenstand auf das System Erdoberfläche-Atmosphäre-Biosphäre zu beobachten. Im Rahmen der interdisziplinären Feldmesskampagne BAYSOFI wurden in Freising-Weihenstephan und einigen benachbarten Orten Messungen zur Strahlung, Grenzschicht-Mikrometeorologie und Photochemie, Photosynthese und Transpiration, die auf kurzzeitige Effekte der Sonnenfinsternis fokussiert waren, durchgeführt. Wenngleich die Großwetterlage am 11. August ungünstig und Zentraleuropa von einer mehr oder weniger dichten Wolkenschicht überdeckt war, herrschten in Weihenstephan recht gute Beobachtungsbedingungen dank eines großen Wolkenlochs, das sich eine halbe Stunde vor der Totalität auftat und über eine Stunde reichte. Dadurch konnten signifikante Effekte der Sonnenfinsternis auf Strahlung, Photolyseraten, OH, die Partitionierung von NO x , Ozon- und PAN-Produktion, Temperatur, Wind, Turbulenzstruktur und Schichtung, Ozon- und CO2-Flüsse, Photosynthese, Transpiration und Saftstrom in Bäumen beobachtet werden, die in der folgenden Sequenz von Artikeln präsentiert und diskutiert werden.

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Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2001/0010-0165

Publication date: May 1, 2001

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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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