Variation of the aerosol stratification over the Rhine Valley during Foehn development: a backscatter lidar study

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Abstract:

The vertical aerosol stratification within and above the Rhine Valley was studied with a backscatter lidar during FORM (Foehn in the Rhine Valley during MAP) IOPs 4–5, October 1–3, 1999. The lidar site was in Tr¨ubbach, 9° 28 E, 47° 04 N, 490 m asl. Two scintillometers were used to monitor the horizontal and the vertical wind velocity at 600 m above the Rhine Valley floor. A number of surface stations were operational in the valley, as well as a set of radiosounding stations. This provides a possibility to correlate the measurements of the aerosol stratification with the variation of the meteorological parameters defining the Foehn development. The backscatter lidar measurements during the Foehn development show the variation of the aerosol backscatter at different altitudes of the valley PBL. The combination of lidar signal gradient and lidar signal variance presents the cold-pool as an aerosol-rich layer and suggests a likely mechanism for cold-pool erosion by the Foehn air.

German
Die vertikale Schichtung von Aerosol in und über dem Rheintal wurde mit einem R ückstreu-Lidar im Rahmen des Projekts FORM (Foehn in the Rhine Valley during MAP) während der Intensivphasen 4 und 5 vom 1. bis 3. Oktober 1999 untersucht. Das Lidar war in Trübbach stationiert (9° 28 E, 47° 04 N, 490 m über Meer). Während FORM wurde die horizontale und vertikale Windgeschwindigkeit 600 m über dem Rheintalgrund mit zwei Szintillometern gemessen. Neben konventionellen Bodenstationen wurden auch einige Radiosondierstationen betrieben. Alle Messungen zusammen erlauben es, die Messungen der Aerosolschichtung mit der Veränderung von meteorologischen Parametern, welche die Föhnentwicklung beschreiben, zu korrelieren. Die Rückstreu-Lidar-Messungen während der Föhnphase zeigen Schwankungen der Aerosolkonzentration an der Obergrenze der Talgrenzschicht. Die Kombination des Lidarsignal-Gradienten und der Lidarsignal-Varianz weist den Kaltluftsee als eine mit Aerosolen angereicherte Schicht aus und zeigt einen wahrscheinlichen Mechanismus für die Abtragung des Kaltluftsees durch die Föhnluft auf.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2004/0013-0175

Publication date: June 1, 2004

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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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