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Free Content Doppler lidar observations of sensible heat flux and intercomparisons with a ground-based energy balance station and WRF model output

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Abstract:

During the Convective and Orographically induced Precipitation Study (COPS), a scanning Doppler lidar was deployed at Achern, Baden-Wüttemberg, Germany from 13 June to 16 August 2007. Vertical velocity profiles ('rays') through the boundary layer were measured every 3 seconds with vertical profiles of horizontal wind velocity being derived from performing azimuth scans every 30 minutes. During Intense Observation Periods radiosondes were launched from the site. In this paper, a case study of convective boundary layer development on 15 July 2007 is investigated. Estimates of eddy dissipation rate are made from the vertically pointing lidar data and used as one input to the velocity-temperature co-variance equation to estimate sensible heat flux. The sensible heat flux values calculated from Doppler lidar data are compared with a surface based energy balance station and output from the Weather Research and Forecasting (WRF) model.

German
Während der Studie zu konvektiven und orographisch induzierten Niederschlägen (Convective and Orographically induced Precipitation Study - COPS) wurde das 1,5 μm scannende Doppler-Lidar der Organisation UFAM (Universities' Facility for Atmospheric Measurement) an seinem Messstandort in Achern, Baden-Württemberg, Deutschland vom 13. Juni bis zum 16. August 2007 von der Universität Salford, UK, betrieben. Vertikale Windgeschwindigkeitsprofile der atmosphärischen Grenzschicht wurden alle 3 Sekunden gemessen. Aus 30-minütigen Azimut-Scans wurden die Horizontalgeschwindigkeitsprofile abgeleitet. Während der intensiven Beobachtungsperioden wurden zusätzlich Radiosonden vom Messplatz gestartet. Im vorliegenden Artikel wird eine konvektive Fallstudie am 15. Juli 2007 näher untersucht. Vom vertikal gerichteten Lidar wird die Eddy-Dissipationsrate abgeschätzt. Sie wird in der Kovarianzgleichung zwischen Windgeschwindigkeit und Temperatur zur Abschätzung des fühlbaren Wärmeflusses verwendet. Die verwendeten Annahmen werden explizit erwähnt. Der für die verwendete Methode benötigte Grad der atmosphärischen Instabilität wird durch den Vergleich mit den Radiosondendaten bestätigt. Die abgeleiteten Ergebnisse stimmen gut mit den Daten der Energiebilanzstation und des WRF Modells überein.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2009/0367

Publication date: April 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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