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Long-term spatiotemporal evaluation of CHIRPS satellite precipitation product over different climatic regions of Iran
Theoretical and Applied Climatology ( IF 3.4 ) Pub Date : 2020-10-14 , DOI: 10.1007/s00704-020-03428-5
Ali Ghozat , Ahmad Sharafati , Seyed Abbas Hosseini

Satellite precipitation products are important data sources in different spatial resolutions, time scales, and spatio-temporal coverage. In this study, the Climate Hazards Group InfraRed Precipitation with Station (CHIRPS) satellite precipitation product with a high spatial resolution (0.05°) is evaluated in the period of 1987 to 2017 over different climate regions of Iran. The accuracy of the satellite product is compared with the 68 ground-based meteorological stations over different time scales (i.e., daily, monthly, and annual) and precipitation classes. Results show that the performance of CHIRPS depends on the time scale, precipitation depth, and climate type. The best performance of the product (CC = 0.80, FRMSE = 0.57, NSE = 0.63) across the country is observed in the annual time scale, while the monthly product offers the best performance in the regional scale. The product provides inadequate performance (CC = 0.34, FRMSE = 5.72, NSE = − 0.2) in daily time scale across the country and most of the climatic regions. The product is found to be most accurate in the south and southwest of the country, while the lowest performance is observed over the Caspian coast. The CHIRPS satellite provides the best performance in detection of no/tiny precipitation (POD > 0.90) and the worst performance in light and low, moderate precipitation (POD < 0.10). It is expected that the findings of the current study can be used to manage the water resources and mitigate the disaster at the national level.



中文翻译:

伊朗不同气候区域的CHIRPS卫星降水产物的长期时空评估

卫星降水产物是具有不同空间分辨率,时间范围和时空覆盖范围的重要数据源。在这项研究中,在1987年至2017年期间,对伊朗不同气候区域的具有高空间分辨率(0.05°)的气候危害小组站内红外降水(CHIRPS)卫星降水产品进行了评估。在不同的时间尺度(即每天,每月和每年)和降水量等级上,将卫星产品的精度与68个地面气象站进行了比较。结果表明,CHIRPS的性能取决于时间尺度,降水深度和气候类型。在年度时间范围内,我们观察到了该产品在全国范围内的最佳性能(CC = 0.80,FRMSE = 0.57,NSE = 0.63),月度产品在区域范围内表现最佳。该产品在全国和大多数气候区域的每日时间范围内提供的性能不足(CC = 0.34,FRMSE = 5.72,NSE = − 0.2)。发现该产品在该国南部和西南部最准确,而在里海沿岸则观察到最低的性能。CHIRPS卫星在无/微小降水(POD> 0.90)的检测中表现最佳,而在轻度和中度降水(POD <0.10)的检测中表现最差。可以预期,本研究的结果可用于管理水资源并减轻国家一级的灾害。2)在全国和大多数气候区域的每日时间范围。发现该产品在该国南部和西南部最准确,而在里海沿岸则观察到最低的性能。CHIRPS卫星在无/微小降水(POD> 0.90)的检测中表现最佳,而在轻度和中度降水(POD <0.10)的检测中表现最差。可以预期,本研究的结果可用于管理水资源并减轻国家一级的灾害。2)在全国和大多数气候区域的每日时间范围。发现该产品在该国南部和西南部最准确,而在里海沿岸则观察到最低的性能。CHIRPS卫星在无/微小降水(POD> 0.90)的检测中表现最佳,而在轻度和中度降水(POD <0.10)的检测中表现最差。可以预期,本研究的结果可用于管理水资源并减轻国家一级的灾害。90),在轻度和中低降水量(POD <0.10)时表现最差。可以预期,本研究的结果可用于管理水资源并减轻国家一级的灾害。90),在轻度和中低降水量(POD <0.10)时表现最差。可以预期,本研究的结果可用于管理水资源并减轻国家一级的灾害。

更新日期:2020-10-14
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