A comprehensive evaluation of the accuracy of satellite-based precipitation estimates over Thailand

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-04-21 DOI:10.1016/j.ejrh.2025.102380

Chanphit Kaprom , James Alexander Williams , Rajeshwar Mehrotra , Chainarong Ophaphaibun , Nutchanart Sriwongsitanon

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引用次数: 0

Abstract

Study region

Thailand

Study focus

This study assessed the performance of fifteen SPE products from the TRMM, GPM IMERG, CHIRP, CMORPH, and PERSIANN families, using 1779 gauged rainfall measurements, covering the period from 2001 to 2015, after undergoing fourteen quality control steps. Various statistical indicators ranked fifteen candidates with normalized scores, revealing performance differences across regions and products. This analysis helps to identify the most suitable products for specific objectives. It also evaluates the performance of SPEs across changes in elevation, rainfall probability, and data-scarce conditions by progressively reducing the amount of gauged rainfall data used. Finally, an ensemble product was developed.

New hydrological insights for the region under study

Firstly, CMORPH-BLD, CHIRPS-Preliminary, TRMM-3B42, and GPM IMERG-Final are the top four performers. Secondly, rainfall estimates from the SPE products were generally underestimated at rare probabilities and overestimated at more frequent ones. Their accuracy was slightly lower at elevations below 200 m, improved up to 800 m with consistent accuracy, and then decreased above 800 m, with minimal gauged rainfall stations increasing uncertainties in assessing SPE product performance at higher elevations. Thirdly, bias correction improved the performance of all SPEs, and accuracy gains were still achievable even with reduced gauged rainfall data. The ensemble of multiple SPEs reduced individual errors, demonstrating their reliability in representing precipitation in Thailand. These findings confirm the robustness of fixed simulation weights for future applications.

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泰国上空基于卫星的降水估计精度的综合评价

本研究评估了来自TRMM、GPM、IMERG、CHIRP、CMORPH和PERSIANN家族的15种SPE产品的性能，使用1779个测量降雨量，涵盖2001年至2015年，经过14个质量控制步骤。各种统计指标对15个候选人进行了标准化得分排名，揭示了不同地区和产品的表现差异。这种分析有助于确定最适合特定目标的产品。它还通过逐步减少所使用的测量降雨量数据的数量来评估spe在海拔变化、降雨概率和数据稀缺条件下的性能。最后，开发了一个集成产品。首先，cmorpho - bld、CHIRPS-Preliminary、TRMM-3B42和GPM imerge - final是表现最好的4个。其次，SPE产品的降雨量估计在罕见概率下通常被低估，而在更频繁的概率下通常被高估。在海拔200 m以下，它们的精度略低，在海拔800 m以下精度保持一致，然后在海拔800 m以上精度下降，最小测量雨量站增加了在高海拔评估SPE产品性能的不确定性。第三，偏差校正提高了所有spe的性能，即使减少了测量的降雨量数据，精度仍然可以提高。多个spe的集合减少了单个误差，证明了它们在表示泰国降水方面的可靠性。这些发现证实了固定模拟权重对未来应用的鲁棒性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.