ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 39 Issue 8 > 2013,39(8):1004-1013. DOI:10.7519/j.issn.1000-0526.2013.08.007 Prev Next
Application of Bright Band Identification and Correction in Radar Based QPE over Tibetan Plateau
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Abstract:
The bright band at 0℃ level is a phenomenon of sudden enhancement of the radar reflectivity due to the melting of snowflakes or ice crystals near the 0℃ isotherm. It is an important factor for the quality of radar data, often causing the over estimation of precipitation. The altitude of Tibetan Plateau is high and the 0℃ level there is low, and the precipitation scopes under the layer are very limited, so the impact of bright band on the precipitation estimate of radar over the Tibetan Plateau is quite remarkable. Therefore, identifying and correcting the bright band automatically is of great significance to improve the precision of radar based quantitative precipitation estimation (QPE) over Tibetan Plateau. Considering the serious blockage of radar beam over Tibetan Plateau, this paper identifies the 0℃ level bright band by calculating the vertical profile of reflectivity and corrects the bright band areas, using the hybrid scan reflectivity before and after the correction to estimate QPE respectively and analyzing the effect of bright band correction on QPE errors. The results show that the height of the bright band from radar is usually several hundred meters under the 0℃ level. Before the bright band correction, the vertical profile of reflectivity curves obviously near the 0℃ layer, causing very clear over estimation of precipitation, but after the bright band correction, the obvious curve of the vertical profile of reflectivity disappears near the 0℃ level so that the radar based QPE is more consistent to the gauge observations and the QPE errors are reduced significantly.
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