Geng, B., and M. Katsumata, 2020: An algorithm for detecting and removing the spurious differential phase observed by C-band polarimetric radar in the rain. J. Meteor. Soc. Japan, 98, 585-613.
Special Edition on Years of the Maritime Continent (YMC)
https://doi.org/10.2151/jmsj.2020-031 Graphical Abstract with highlights
Plain Language Summary: An algorithm is developed to detect the spurious differential phase ФDP and specific differential phase KDP in the rain. The development and validation of the algorithm was conducted using the data observed by the C-band polarimetric radar aboard the research vessel Mirai during a pilot field campaign of the Years of the Maritime Continent (YMC) project. The algorithm developed in this study facilitates the quality control of ФDP and KDP.
- The algorithm is a threshold filter that is designed based on the empirical relationship between the KDP and radar reflectivity factor at horizontal polarization ZH for raindrops.
- The positively and negatively biased KDP values can be efficiently detected by this new algorithm, while quality data, especially those with high ZH values, remain unaffected as far as possible.
- The standard deviation of the KDP in areas with relatively low ZH is also significantly reduced by applying the algorithm.