Research on Downscaling and Correction of TRMM Data in Central China

Zhang, Hanbo; Dou, Shiqing; Xu, Yong; Zeyu, Nan

doi:10.1007/978-3-030-70626-5_33

Cited by 1 publication

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“…As the most active element of the atmosphere, precipitation is the basic component of the Earth's water cycle and plays an indispensable role in the atmospheric process for various space-time scales [1]. China is located in the East Asian monsoon area.…”

Section: Introductionmentioning

confidence: 99%

Precipitation Estimation Using FY-4B/AGRI Satellite Data Based on Random Forest

Huang,

Bao,

Petropoulos

et al. 2024

Remote Sensing

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Precipitation is the basic component of the Earth’s water cycle. Obtaining high-resolution and high-precision precipitation data is of great significance. This paper establishes a precipitation retrieval model based on a random forest classification and regression model during the day and at night with FY-4B/AGRI Level1 data on China from July to August 2022. To evaluate the retrieval effect of the model, the GPM IMERG product is used as a reference, and the retrieval results are compared against those of the FY-4B/AGRI operational precipitation product. In addition, the retrieval results are analyzed according to different underlying surfaces. The results showed that compared with the FY-4B/AGRI operational precipitation product, the retrieval model can better identify precipitation and capture precipitation areas of light rain, moderate rain, heavy rain and torrential rain. Among them, the probability of detection (POD) of the day model increased from 0.328 to 0.680, and the equitable threat score (ETS) increased from 0.252 to 0.432. The POD of the night model increased from 0.337 to 0.639, and the ETS score increased from 0.239 to 0.369. Meanwhile, the precipitation estimation accuracy of the day model increased by 38.98% and that of the night model increased by 40.85%. Our results also showed that due to the surface uniformity of the ocean, the model can identify precipitation better on the ocean than on the land. Our findings also indicated that for the different underlying surfaces of the land, there is no significant difference in each evaluation index of the model. This is a strong argument for the universal applicability of the model. Notably, the results showed that, especially for more vegetated areas and areas covered by water, the model is capable of estimating precipitation. In conclusion, the precipitation retrieval model that is proposed herein can better determine precipitation regions and estimate precipitation intensities compared with the FY-4B/AGRI operational precipitation product. It can provide some reference value for future precipitation retrieval research on FY-4B/AGRI.

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Section: Introductionmentioning

confidence: 99%