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Free Content Depiction of complex airflow near Hong Kong International Airport using a Doppler LIDAR with a two-dimensional wind retrieval technique

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Abstract:

The Hong Kong Observatory (HKO) operates a Doppler LIght Detection And Ranging (LIDAR) system at the Hong Kong International Airport (HKIA) to monitor the airflow around the airport area. The LIDAR measures the radial component of the wind field. To better visualize the airflow, a variational method which has been successfully applied to Doppler Radar data is adopted in this study to retrieve the two-dimensional wind field based on the LIDAR measurements. The wind field so obtained is found to reveal many salient features of terrain-induced airflow disturbances at HKIA, such as mountain waves and vortices. Its application to the detection of low-level windshear is demonstrated through selected cases. With a simple extension of the variational method, dual-Doppler analysis is also carried out using the radial velocity data from both the LIDAR and a Terminal Doppler Weather Radar (TDWR) to retrieve the wind field at the airport area in a gust front event.

German
Das Hong Kong Observatorium (HKO) betreibt am Internationalen Flughafen von Hong Kong (HKIA) ein Doppler-LIDAR-System zur Überwachung des Windfeldes im Bereich des Flughafens. Das LIDAR misst nur die radiale Komponente des Windfeldes. Für eine bessere Visualisierung der Strömung ist daher in dieser Studie erfolgreich eine Variationsmethode auf die Doppler-Radar-Daten angewendet worden, um das zweidimensionale Windfeld aus den LIDAR-Messungen abzuleiten. Das so erhaltene Windfeld enthält viele charakteristische Strukturen wie Schwerewellen und Wirbel, die auf Geländestrukturen in der Nähe von HKIA zurückzuführen sind. Die Anwendung der Methode zur Aufspürung von bodennahen Windscherungen wird an einigen Beispielen demonstriert. Über eine einfache Ausweitung der Variationsmethode wird auch eine Dual-Doppler-Analyse der Daten der radialen Windkomponenten aus den LIDAR- und Terminal Doppler-Wetterradar-Messungen ausgeführt, um das Windfeld in Flughafennähe beim Durchzug einer Böenfront zu erhalten.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2007/0220

Publication date: October 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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