Mixing height determination with lidar ceilometers – results from Helsinki Testbed

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Abstract:

Helsinki Testbed is a research project of mesoscale meteorology. Data from various meteorological sensors including five lidar ceilometers situated in and around Helsinki have been collected since 2005. The ceilometers report attenuated backscatter profiles that have been evaluated in respect of mixing height determination. Two different methods, a gradient method and an idealized backscatter method have been applied for this purpose. Data examples from different meteorological situations are discussed. The enhanced single lens optical concept of the ceilometers improves their ability to detect nocturnal stable layers. Residual layers are visible up to heights exceeding 2500 m. Such layers can also be seen in data from the space-borne lidar CALIOP.

German
Im Rahmen des Forschungsprojekts ,,Helsinki Testbed" werden regionale Wetterphänomene untersucht. Seit 2005 sorgt eine Vielzahl von meteorologischen Messsystemen, darunter fünf Laser-Ceilometer, für die erforderlichen Messdaten. Ceilometer liefern Profile der durch atmosphärische Streuung geschwächten Rückstreuintensität, aus denen die Höhe der Mischungsschicht ableitbar ist. Zwei Berechnungsverfahren dazu werden vorgestellt und anhand von verschiedenen Wettersituationen diskutiert, eine Gradientenmethode und eine idealisierte Rückstreumethode. Das innovative optische Konzept der nur mit einer Linse arbeitenden Ceilometer erhöht ihre Detektionsempfindlichkeit für nächtliche bodennahe Kaltluftschichten. Residualschichten, die auch vom Weltraumlidar CALIOP gesehen wurden, sind noch in Höhen über 2500 m erkennbar.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2007/0221

Publication date: August 1, 2007

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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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