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Free Content A modified Bowen ratio method to determine sensible and latent heat fluxes

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The sensible heat flux (H) and the latent heat flux (λE) were measured above a grassland during June, 1997 (LINEX-97/1 Experiment), using the eddy covariance method (EC) and the Bowen ratio/Energy balance method (BREB). The results indicate that HBREB is about (30 ± 20) Wm-2 higher than HEC, and λEBREB is about (180 ± 40) Wm-2 higher than λEEC during the daytime, and this is mainly caused by an imbalance in the closure of the surface energy balance in the BREB. In order to avoid the inaccuracies associated with the surface energy balance method, we propose a modified Bowen ratio method (MBR) to determine sensible and latent heat fluxes without using the surface energy balance equation. The results and error analysis show that MBR can give more accurate results than BREB. For the MBR, a measurement system using a sonic anemometer together with temperature and humidity measurements at two levels is being recommended to obtain sensible and latent heat fluxes.

Der fühlbare (H) und der latente (λE) Wärmestrom wurden während des Experimentes LINEX-97/1 im Juni 1997 über Grasland mit der Eddy-Kovarianz-Methode (EC) und der Bowen-Ratio-/Energiebilanz-Methode (BREB) erfasst. Die Ergebnisse zeigten, dass am Tage HBREB etwa (30 ± 20) Wm-2 höher als HEC liegt und λEBREB etwa (180 ± 40) Wm-2 höher als λEEC, was im wesentlichen auf einer Unausgeglichenheit in der Schließung der Energiebilanz am Boden bei BREB zurückgeführt werden kann. Um diese Unsicherheiten in der Energiebilanz auszuschließen, wird ein modifiziertes Bowen-Ratio-Verfahren (MBR) zur Bestimmung des fühlbaren und latenten Wärmestromes vorgeschlagen, welches die Energiebilanzgleichung nicht nutzt. Die Fehleranalyse zeigt, dass die MBR-Methode geringere Fehler aufweist als BREB. Für die MBR werden ein Messsystem aus einem Ultraschallanemometer und Messungen der Temperatur und Feuchte in zwei Niveaus benötigt.

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Document Type: Research Article

Affiliations: 1: University of Bayreuth, Department of Micrometeorology, Bayreuth, Germany and Department of Geophysics, Peking University, China 2: University of Bayreuth, Department of Micrometeorology, Bayreuth, Germany

Publication date: 2001-01-01

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