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http://dx.doi.org/10.3741/JKWRA.2015.48.1.57

Quantitative Rainfall Estimation for S-band Dual Polarization Radar using Distributed Specific Differential Phase  

Lee, Keon-Haeng (Department of Hydro Science and Engineering, Korea Institute of Civil Engineering and Building Technology)
Lim, Sanghun (Department of Hydro Science and Engineering, Korea Institute of Civil Engineering and Building Technology)
Jang, Bong-Joo (Department of Hydro Science and Engineering, Korea Institute of Civil Engineering and Building Technology)
Lee, Dong-Ryul (Department of Hydro Science and Engineering, Korea Institute of Civil Engineering and Building Technology)
Publication Information
Journal of Korea Water Resources Association / v.48, no.1, 2015 , pp. 57-67 More about this Journal
Abstract
One of main benefits of a dual polarization radar is improvement of quantitative rainfall estimation. In this paper, performance of two representative rainfall estimation methods for a dual polarization radar, JPOLE and CSU algorithms, have been compared by using data from a MOLIT S-band dual polarization radar. In addition, this paper presents evaluation of specific differential phase ($K_{dp}$) retrieval algorithm proposed by Lim et al. (2013). Current $K_{dp}$ retrieval methods are based on range filtering technique or regression analysis. However, these methods can result in underestimating peak $K_{dp}$ or negative values in convective regions, and fluctuated $K_{dp}$ in low rain rate regions. To resolve these problems, this study applied the $K_{dp}$ distribution method suggested by Lim et al. (2013) and evaluated by adopting new $K_{dp}$ to JPOLE and CSU algorithms. Data were obtained from the Mt. Biseul radar of MOLIT for two rainfall events in 2012. Results of evaluation showed improvement of the peak $K_{dp}$ and did not show fluctuation and negative $K_{dp}$ values. Also, in heavy rain (daily rainfall > 80 mm), accumulated daily rainfall using new $K_{dp}$ was closer to AWS observation data than that using legacy $K_{dp}$, but in light rain(daily rainfall < 80mm), improvement was insignificant, because $K_{dp}$ is used mostly in case of heavy rain rate of quantitative rainfall estimation algorithm.
Keywords
dual polarization radar; specific differential phase; quantitative rainfall estimation;
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