• Adv. Atmos. Sci.  2019, Vol. 36 Issue (1): 41-54    DOI: 10.1007/s00376-018-8032-7
    Evaluating the Algorithm for Correction of the Bright Band Effects in QPEs with S-, C- and X-Band Dual-Polarized Radars
    Yang CAO1, 2, 3, Debin SU2, 5, Xingang FAN2, 4, Hongbin CHEN1, *()
    1Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
    2College of Electronic Engineering, Chengdu University of Information Technology, Chengdu 610225, China
    3Sichuan Meteorological Disasters Prevention Technology Center, Chengdu 610072, China
    4Department of Geography and Geology, Western Kentucky University, Bowling Green, KY 42101, USA
    5China Meteorological Administration Key Laboratory of Atmospheric Sounding, Chengdu 610225, China
    Abstract
    Abstract  

    The bright band, a layer of enhanced radar reflectivity associated with melting ice particles, is a major source of significant overestimation in quantitative precipitation estimation (QPE) based on the Z-R (reflectivity factor-rain rate) relationship. The effects of the bright band on radar-based QPE can be eliminated by vertical profile of reflectivity (VPR) correction. In this study, we applied bright-band correction algorithms to evaluate three different bands (S-, C- and X-band) of dual-polarized radars and to reduce overestimation errors in Z-R relationship-based QPEs. After the reflectivity was corrected by the algorithms using average VPR (AVPR) alone and a combination of average VPR and the vertical profile of the copolar correlation coefficient (AVPR+CC), the QPEs were derived. The bright-band correction and resulting QPEs were evaluated in eight precipitation events by comparing to the uncorrected reflectivity and rain-gauge observations, separately. The overestimation of Z-R relationship-based QPEs associated with the bright band was reduced after correction by the two schemes for which hourly rainfall was less than 5 mm. For the verification metrics of RMSE (root-mean-square error), RMAE (relative mean absolute error) and RMB (relative mean bias) of QPEs, averaged over all eight cases, the AVPR method improved from 2.28, 0.94 and 0.78 to 1.55, 0.60 and 0.40, respectively, while the AVPR+CC method improved to 1.44, 0.55 and 0.30, respectively. The QPEs after AVPR+CC correction had less overestimation than those after AVPR correction, and similar conclusions were drawn for all three different bands of dual-polarized radars.

    Keywords dual-polarized radar      bright band      QPE      vertical profile of reflectivity     
    Corresponding Authors: Hongbin CHEN   
    Just Accepted Date: 23 August 2018   Issue Date: 01 November 2018
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    Yang CAO
    Debin SU
    Xingang FAN
    Hongbin CHEN
    Cite this article:   
    Yang CAO,Debin SU,Xingang FAN, et al. Evaluating the Algorithm for Correction of the Bright Band Effects in QPEs with S-, C- and X-Band Dual-Polarized Radars[J]. Adv. Atmos. Sci., 2019, 36(1): 41 -54 .
    URL:  
    http://159.226.119.58/aas/EN/10.1007/s00376-018-8032-7     OR     
    http://159.226.119.58/aas/EN/Y2019/V36/I1/41
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