Polarimetric Rainfall Retrieval from a C-Band Weather Radar in a Tropical Environment (The Philippines)

被引:21
|
作者
Crisologo, I. [1 ]
Vulpiani, G. [2 ]
Abon, C. C. [1 ,3 ]
David, C. P. C. [1 ]
Bronstert, A. [3 ]
Heistermann, M. [1 ]
机构
[1] Univ Philippines Diliman, Natl Inst Geol Sci, Quezon City, Philippines
[2] Presidency Council Ministers, Dept Civil Protect, Rome, Italy
[3] Univ Potsdam, Inst Earth & Environm Sci, D-14476 Potsdam, Germany
关键词
Dual-Pol; weather radar; quantitative precipitation estimation; differential propagation phase; attenuation; The Philippines; DIFFERENTIAL PHASE; ALGORITHM; ATTENUATION; WSR-88D; AREAS;
D O I
10.1007/s13143-014-0049-y
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
We evaluated the potential of polarimetric rainfall retrieval methods for the Tagaytay C-Band weather radar in the Philippines. For this purpose, we combined a method for fuzzy echo classification, an approach to extract and reconstruct the differential propagation phase, Phi(DP), and a polarimetric self-consistency approach to calibrate horizontal and differential reflectivity. The reconstructed Phi(DP) was used to estimate path-integrated attenuation and to retrieve the specific differential phase, K-DP. All related algorithms were transparently implemented in the Open Source radar processing software wradlib. Rainfall was then estimated from different variables: from re-calibrated reflectivity, from re-calibrated reflectivity that has been corrected for path-integrated attenuation, from the specific differential phase, and from a combination of reflectivity and specific differential phase. As an additional benchmark, rainfall was estimated by interpolating the rainfall observed by rain gauges. We evaluated the rainfall products for daily and hourly accumulations. For this purpose, we used observations of 16 rain gauges from a five-month period in the 2012 wet season. It turned out that the retrieval of rainfall from K-DP substantially improved the rainfall estimation at both daily and hourly time scales. The measurement of reflectivity apparently was impaired by severe miscalibration while K-DP was immune to such effects. Daily accumulations of rainfall retrieved from K-DP showed a very low estimation bias and small random errors. Random scatter was, though, strongly present in hourly accumulations.
引用
收藏
页码:43 / 55
页数:13
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