全球IMERG卫星反演和ERA5陆面再分析降水在四川地区的适用性研究

doi:10.3969/j.issn.1673-503X.2024.03.008

Abstract

Abstract:

Using precipitation observation data from China Meteorological Administration ground stations from 2019 to 2020, six quantitative evaluation indicators including correlation coefficients (CCs), mean bias errors (MBEs), root mean square errors (RMSEs), probability of detections (PODs), false alarm rates (FARs), and critical success indices (CSIs) were used to analyze the accuracy and regional applicability of the IMERG multi-satellite remote sensing retrieval of the Global New Generation Global Precipitation Measurement Program (GPM) and the European Centre for Medium-Range Weather Forecasts (ECMWF) Fifth Generation Land Surface Reanalysis (ERA5L) precipitation products in Sichuan region, China. The results show that the two products have a strong precipitation zone on the eastern side of the western Sichuan Plateau, roughly distributed in a quasi north-south direction, and that ERA5L can capture heavy precipitation centers more accurately compared to IMERG. The consistency between station observations within the basin is better than in the surrounding mountainous areas. The precipitation of IMERG and ERA5L was 15.2% and 33.3%, respectively, higher than that observed by the station, respectively. The two products have a relatively high ability to capture precipitation events in the western Sichuan Plateau, with low FAR. From the perspective of time test statistical indicators, the trends and magnitude changes observed by the two products and stations are basically consistent, with relatively high relative station observations being the main trend. Compared to IMERG, ERA5L has a high CC with site observations, a high POD, a high CSI, and a low deviation, but a relatively high FAR. Overall, both IMERG and ERA5L precipitation products have shown certain potential for application in Sichuan province, but there are significant differences in accuracy under different precipitation intensities and terrain conditions, requiring product correction.

Key words: Precipitation, Satellite retrieval, Land surface reanalysis, Integrated Multi-satellite Retrievals for GPM (IMERG), European Fifth Generation Land Surface Reanalysis (ERA5L), Accuracy evaluation

CLC Number:

P426.6

Xiaolong HUANG,Xiaoming XIANG,Liwei WANG,Shiying LI,Yuhe JIANG. Research on the applicability of IMERG satellite retrieval and ERA5 land reanalysis precipitation products in Sichuan region, China[J]. Journal of Meteorology and Environment, 2024, 40(3): 65-75.

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降水产品	日平均降水量/(mm·d^-1)	台站日平均降水量/(mm·d^-1)	CC	MBE/(mm·d^-1)	RMSE/(mm·d^-1)	POD	FAR	CSI
IMERG	3.8	3.3	0.674	0.504	9.0	0.724	0.361	0.514
ERA5L	4.4	3.3	0.621	1.14	8.9	0.963	0.442	0.546

降水强度/(mm·d^-1)	样本数	占比/(%)	IMERG日平均降水量/(mm·d^-1)	ERA5L日平均降水量/(mm·d^-1)	台站观测日平均降水量/(mm·d^-1)
0.1~9.9	1 075 391	33.17	3.6	5.1	2.3
10.0~24.9	187 498	5.78	14.7	14.1	15.6
25.0~49.9	63 965	1.97	28.9	23.9	34.4
≥50.0	31 246	0.96	60.4	43.2	84.0

降水强度/(mm·d^-1)	降水产品	CC	MBE/(mm·d^-1)	RMSE/(mm·d^-1)	POD	FAR	CSI
0.1~9.9	IMERG	0.313	1.225	6.9	0.563	0.501	0.359
0.1~9.9	ERA5L	0.329	2.733	7.0	0.821	0.544	0.415
10.0~24.9	IMERG	0.198	-0.865	16.2	0.315	0.72	0.174
10.0~24.9	ERA5L	0.187	-1.471	12.2	0.444	0.723	0.206
25.0~49.9	IMERG	0.186	-5.444	26.8	0.274	0.774	0.141
25.0~49.9	ERA5L	0.159	-10.502	22.3	0.279	0.756	0.15
≥50.0	IMERG	0.373	-23.556	52.3	0.51	0.589	0.295
≥50.0	ERA5L	0.389	-40.735	59.6	0.29	0.596	0.203

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Research on the applicability of IMERG satellite retrieval and ERA5 land reanalysis precipitation products in Sichuan region, China

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