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Free Content Impacts of the solar eclipse of 11 August 1999 on routinely recorded meteorological and air quality data in south-west Germany

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The total solar eclipse of 11 August 1999 over Central Europe was also visible in Baden-Wuerttemberg, a state in south-west Germany. To investigate the impact of the total solar eclipse on the lower planetary boundary layer, meteorological and air quality data extracted from routine measurements at six sites in Baden-Wuerttemberg were examined. The meteorological data were recorded at the Plittersdorf meteorological station (in the path of totality of the total solar eclipse) and at the Forest meteorological Site Hartheim (outside the path of totality of the total solar eclipse). The air quality data were obtained from four official air quality monitoring stations located at Freudenstadt, Karlsruhe-West, Rastatt and Welzheimer Wald, all of which lie within the path of totality of the total solar eclipse. Due to cloudiness, weather conditions on 11 August 1999 were not optimal in south-west Germany. However, the transient reduction (followed by a rise) induced by the total solar eclipse on meteorological variables including global solar radiation, upward longwave radiation, net radiation, air temperature, horizontal wind speed, elevation angle of the three-dimensional wind vector as well as turbulent sensible and latent heat fluxes was quite obvious. Despite unfavourable weather conditions, half-hourly mean values of ozone routinely measured at the above-mentioned standard official air quality monitoring stations showed a varying decline up to 27% at the urban station Rastatt and 37% at the background station Welzheimer Wald. This decline was owing mainly to the fall in global radiation during the total solar eclipse. However, additional influences by advection and deposition can not be precluded.

Die totale Sonnenfinsternis am 11. August 1999 u¨ber Mitteleuropa konnte auch im Su¨dwesten von Deutschland im Bundesland Baden-Wu¨rttemberg beobachtet werden. Ihre Auswirkung auf die untere planetare Grenzschicht wurde u¨ber Daten untersucht, die routinema¨ßig an der meteorologischen Station Plittersdorf in der Kernzone der Sonnenfinsternis und an der Forstmeteorologischen Messstelle Hartheim außerhalb der Kernzone der Sonnenfinsternis sowie an den vier amtlichen Luftmessstationen Freudenstadt, Karlsruhe-West, Rastatt und Welzheimer Wald innerhalb der Kernzone der Sonnenfinsternis erhoben werden. Obwohl am 11. August 1999 in Su¨dwestdeutschland kein Strahlungswetter herrschte, ließen sich als Folge der Sonnenfinsternis die Abnahme und anschließende Zunahme von Globalstrahlung, langwelliger Ausstrahlung der Erdoberfla¨che, Strahlungsbilanz, Lufttemperatur, horizontaler Windgeschwindigkeit, Elevationswinkel des dreidimensionalen Windvektors sowie turbulenter Stro¨me fu¨hlbarer und latenter Wa¨rme erkennen. Trotz ungu¨nstiger Wetterverha¨ltnisse zeigte sich auch bei den Halbstundenmittelwerten von Ozon, die an amtlichen Luftqualita¨tsmessstellen in der Kernzone der Sonnenfinsternis in Baden-Wu¨rttemberg routinema¨ßig gemessen werden, ha¨ufig eine Reduktion. Sie betrug an der Stadtstation Rastatt bis zu ca. 27% und an der Hintergrundstation Welzheimer Wald bis zu 37%. Ausschlaggebend dafu¨r war die tempora¨re Abnahme der Globalstrahlung durch die Sonnenfinsternis; zusa¨tzliche Advektions- und Depositionseinflu¨sse ko¨nnen jedoch nicht ausgeschlossen werden.


Document Type: Research Article


Publication date: May 1, 2001

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