Temporal-Spatial Distribution Characteristics of Quantitative Precipitation Estimation Accuracy using X-band Multi-Parameter Radar over the Hokuriku Region

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  • 北陸地方におけるXバンドMPレーダの降水量推定精度に関する時空間分布特性
  • ホクリク チホウ ニ オケル Xバンド MP レーダ ノ コウスイリョウ スイテイ セイド ニ カンスル ジクウカン ブンプ トクセイ

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Abstract

 This study was designed to clarify the accuracy of X-band multi-parameter radar (X-MP) over the Hokuriku region using rain gauge data and quantitative precipitation estimation (QPE) by C-band radar. Moreover, this study used results of the correlation coefficient and estimate error for QPE accuracy analysis.<br> Temporal analysis revealed that X-MPs provide observation data with high accuracy for short-term downpours, but results for long-term and light rainfall or regions distant from the radar site were less accurate.<br> Spatial analysis showed the X-MP data accuracy was observable with sufficient accuracy within a range of 2.25 × 2.25 km as the center of each rain gauge station. The X-MP data accuracy has less than the C-band radar data accuracy beyond a 20 km radius from the radar site.<br> Quantitative analysis of the rainy season and snowy season, total precipitation of X-MP and C-band radar were overestimated from that of the rain gauge station, it was especially overestimated significantly during the snowy season.

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