Evaluation of satellite-based precipitation products from GPM IMERG and GSMaP over the three-river headwaters region, China

The three-river headwaters region (TRHR) is the birthplace of the Yangtze River, the Yellow River and the Lantsang River in China. Based on the grid surface precipitation data released by China Meteorological Administration (CMA), this paper evaluated the accuracy and error components of four near-r...

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Main Authors: Hua Wang, Yixian Yuan, Suikang Zeng, Wuyan Li, Xiaobo Tang
Format: Article
Language:English
Published: IWA Publishing 2021-12-01
Series:Hydrology Research
Subjects:
Online Access:http://hr.iwaponline.com/content/52/6/1328
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author Hua Wang
Yixian Yuan
Suikang Zeng
Wuyan Li
Xiaobo Tang
author_facet Hua Wang
Yixian Yuan
Suikang Zeng
Wuyan Li
Xiaobo Tang
author_sort Hua Wang
collection DOAJ
description The three-river headwaters region (TRHR) is the birthplace of the Yangtze River, the Yellow River and the Lantsang River in China. Based on the grid surface precipitation data released by China Meteorological Administration (CMA), this paper evaluated the accuracy and error components of four near-real-time satellite precipitation products (GSMaP-NRT, GSMaP-MVK, IMERG-Early and IMERG-Late) in the era of a GPM (Global Precipitation Measurement) in TRHR. The conclusions are as follows: (1) The precipitation in TRHR is concentrated in the east and south, and the precipitation in the west is very low. IMERG (Early and Late) has a good spatial distribution of precipitation, while GSMaP has an obvious spatial smoothing of precipitation distribution, and does not better highlight the local precipitation characteristics. (2) The inversion accuracy of the satellite products is the best in the source region of the Lantsang River, followed by the source region of the Yellow River. The satellite products all show the lower correlation coefficient and serious underestimation of precipitation in the west of the TRHR. In addition, the closer to the west of the TRHR, the lower hit rate and the higher false alarm rate of the satellite products, especially the NRT and MVK products. In the eastern margin of the Yellow River headwater region and the Lantsang River headwater Region, RMSE and overestimated precipitation were higher in NRT and MVK, and FAR was higher in spite of higher POD and CSI. (3) The errors of GSMaP in the source region of the Yellow River and the Lantsang River are mainly caused by misreporting precipitation and overestimating the precipitation level, while the errors of GSMaP in the west of the TRHR are mainly caused by missing measurements of precipitation events. The underestimated precipitation of IMERG mainly comes from the missed measurement of precipitation and the underestimate of precipitation level, and there is no large false precipitation. (4) In addition, we found that the satellite products in the lake distribution area of the TRHR have serious missed precipitation errors, indicating that the GPM satellite products have the poor detection ability of precipitation near plateau lakes. On the whole, the precipitation inversion accuracy of IMERG (Early and Late) products is higher, which can better detect the occurrence of precipitation events, but the estimation of precipitation level is still not accurate. The precision of precipitation of satellite products near inland lakes on the plateau is poor, so the algorithm improvement of new products needs to be further solved in the future. HIGHLIGHTS The error performance of IMERG and GSMaP products over the three-river headwaters region in China.; IMERG has a good spatial distribution of precipitation.; The satellite products all show the lower correlation coefficient in the west of the study area.; The estimation of precipitation level of IMERG is still not accurate.; GPM satellite products have the poor detection ability of precipitation near plateau lakes.;
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spelling doaj.art-e8abad0c17e64a859ce9f6d7b94ce5d22022-12-21T19:37:07ZengIWA PublishingHydrology Research1998-95632224-79552021-12-015261328134310.2166/nh.2021.029029Evaluation of satellite-based precipitation products from GPM IMERG and GSMaP over the three-river headwaters region, ChinaHua Wang0Yixian Yuan1Suikang Zeng2Wuyan Li3Xiaobo Tang4 Zhejiang University of Finance and Economics Dongfang College, Haining 314408, China Zhejiang University of Finance and Economics Dongfang College, Haining 314408, China POWERCHINA Sichuan Electric Power Engineering Co., Ltd, Chengdu 610041, China Zhejiang University of Finance & Economics, Hangzhou 310018, China Zhejiang University of Finance and Economics Dongfang College, Haining 314408, China The three-river headwaters region (TRHR) is the birthplace of the Yangtze River, the Yellow River and the Lantsang River in China. Based on the grid surface precipitation data released by China Meteorological Administration (CMA), this paper evaluated the accuracy and error components of four near-real-time satellite precipitation products (GSMaP-NRT, GSMaP-MVK, IMERG-Early and IMERG-Late) in the era of a GPM (Global Precipitation Measurement) in TRHR. The conclusions are as follows: (1) The precipitation in TRHR is concentrated in the east and south, and the precipitation in the west is very low. IMERG (Early and Late) has a good spatial distribution of precipitation, while GSMaP has an obvious spatial smoothing of precipitation distribution, and does not better highlight the local precipitation characteristics. (2) The inversion accuracy of the satellite products is the best in the source region of the Lantsang River, followed by the source region of the Yellow River. The satellite products all show the lower correlation coefficient and serious underestimation of precipitation in the west of the TRHR. In addition, the closer to the west of the TRHR, the lower hit rate and the higher false alarm rate of the satellite products, especially the NRT and MVK products. In the eastern margin of the Yellow River headwater region and the Lantsang River headwater Region, RMSE and overestimated precipitation were higher in NRT and MVK, and FAR was higher in spite of higher POD and CSI. (3) The errors of GSMaP in the source region of the Yellow River and the Lantsang River are mainly caused by misreporting precipitation and overestimating the precipitation level, while the errors of GSMaP in the west of the TRHR are mainly caused by missing measurements of precipitation events. The underestimated precipitation of IMERG mainly comes from the missed measurement of precipitation and the underestimate of precipitation level, and there is no large false precipitation. (4) In addition, we found that the satellite products in the lake distribution area of the TRHR have serious missed precipitation errors, indicating that the GPM satellite products have the poor detection ability of precipitation near plateau lakes. On the whole, the precipitation inversion accuracy of IMERG (Early and Late) products is higher, which can better detect the occurrence of precipitation events, but the estimation of precipitation level is still not accurate. The precision of precipitation of satellite products near inland lakes on the plateau is poor, so the algorithm improvement of new products needs to be further solved in the future. HIGHLIGHTS The error performance of IMERG and GSMaP products over the three-river headwaters region in China.; IMERG has a good spatial distribution of precipitation.; The satellite products all show the lower correlation coefficient in the west of the study area.; The estimation of precipitation level of IMERG is still not accurate.; GPM satellite products have the poor detection ability of precipitation near plateau lakes.;http://hr.iwaponline.com/content/52/6/1328accuracy evaluationerror decompositiongsmapimergthe three-river headwaters region
spellingShingle Hua Wang
Yixian Yuan
Suikang Zeng
Wuyan Li
Xiaobo Tang
Evaluation of satellite-based precipitation products from GPM IMERG and GSMaP over the three-river headwaters region, China
Hydrology Research
accuracy evaluation
error decomposition
gsmap
imerg
the three-river headwaters region
title Evaluation of satellite-based precipitation products from GPM IMERG and GSMaP over the three-river headwaters region, China
title_full Evaluation of satellite-based precipitation products from GPM IMERG and GSMaP over the three-river headwaters region, China
title_fullStr Evaluation of satellite-based precipitation products from GPM IMERG and GSMaP over the three-river headwaters region, China
title_full_unstemmed Evaluation of satellite-based precipitation products from GPM IMERG and GSMaP over the three-river headwaters region, China
title_short Evaluation of satellite-based precipitation products from GPM IMERG and GSMaP over the three-river headwaters region, China
title_sort evaluation of satellite based precipitation products from gpm imerg and gsmap over the three river headwaters region china
topic accuracy evaluation
error decomposition
gsmap
imerg
the three-river headwaters region
url http://hr.iwaponline.com/content/52/6/1328
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AT suikangzeng evaluationofsatellitebasedprecipitationproductsfromgpmimergandgsmapoverthethreeriverheadwatersregionchina
AT wuyanli evaluationofsatellitebasedprecipitationproductsfromgpmimergandgsmapoverthethreeriverheadwatersregionchina
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