A Preliminary Assessment of the Gauge-Adjusted Near-Real-Time GSMaP Precipitation Estimate over Mainland China
A Preliminary Assessment of the Gauge-Adjusted Near-Real-Time GSMaP Precipitation Estimate over Mainland China
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DOI：
10.3390/rs12010141
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Dekai Lu;B. Yong
中科院分区：
文献类型：
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作者：
Dekai Lu;B. Yong
近实时的卫星降水量估计是有吸引力的极端降水监测和自然灾害预警等广泛的应用。最近，制作了一个经雨量计调整的近实时全球降水测绘卫星降水估计值（GSMaP_Gauge_NRT），以提高原始GSMaP_NRT的质量。本研究利用中国大陆地区的观测资料对GSMaP_Gauge_NRT的性能进行了研究和验证。分析表明，GSMaP_NRT普遍高估了中国的降水量。校准后，GSMaP_Gauge_NRT有效地降低了这种偏差，并且与量规观察结果更加一致。GSMaP_Gauge_NRT的订正方案主要作用于卫星降水估计的命中事件，很难弥补卫星降水估计的缺失事件。最后，我们将评估扩展到全球范围，以便更广泛地了解GSMaP_Gauge_NRT。全局比较显示，GSMaP_Gauge_NRT与GSMaP_Gauge产品具有良好的一致性。总之，GSMaP_Gauge_NRT的性能优于GSMaP_NRT，是一种更可靠的近实时卫星降水产品。
The near-real-time satellite-derived precipitation estimates are attractive for a wide range of applications like extreme precipitation monitoring and natural hazard warning. Recently, a gauge-adjusted near-real-time GSMaP precipitation estimate (GSMaP_Gauge_NRT) was produced to improve the quality of the original GSMaP_NRT. In this study, efforts were taken to investigate and validate the performance of the GSMaP_Gauge_NRT using gauge observations over Mainland China. The analyses indicated that GSMaP_NRT generally overestimated the gauge precipitation in China. After calibration, the GSMaP_Gauge_NRT effectively reduced this bias and was more consistent with gauge observations. Results also showed that the correction scheme of GSMaP_Gauge_NRT mainly acted on hit events and could hardly make up the miss events of the satellite precipitation estimates. Finally, we extended the evaluation to the global scale for a broader view of GSMaP_Gauge_NRT. The global comparisons exhibited that the GSMaP_Gauge_NRT was in good agreement with the GSMaP_Gauge product. In conclusion, the GSMaP_Gauge_NRT had better performance than the GSMaP_NRT and was a more reliable near-real-time satellite precipitation product.