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Influence of typhoons on the spatiotemporal variation in rainfall erosivity in the Pearl River Basin

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Abstract

A typhoon can change the rainfall pattern over its path. Exploring the impact of typhoons on rainfall erosivity (RE) is very important for the prevention and control of soil erosion in key areas of the Pearl River Basin. Based on the long-term daily rainfall products from 1960 to 2020 and the GPM high-resolution rainfall products from 2001 to 2020, the Mann-Kendall test, Bernaola Galvan segmentation algorithm, and spatial autocorrelation are used in this study to analyze the spatiotemporal variation characteristics of RE and the influence of typhoons. The results indicate that (1) RE has obvious spatiotemporal heterogeneity. The average annual RE is 11,314.10 MJ·mm·ha−2·h−1. The RE shows an upward trend of 8.63 MJ·mm·ha−2·h−1/year, and this study shows that an abrupt change point occurred in 1992. In addition, the RE decreases from southeast to northwest, showing an extremely significant agglomeration near the delta. (2) The spatiotemporal variations in typhoon RE are different from those of the RE across all periods. Typhoons slow the increase in RE, change the abrupt change points, and increase the degree of agglomeration. There are significant resonance periods between typhoons and RE. (3) RE is significantly correlated with the typhoon potential risk index. Typhoons affect RE by increasing precipitation, the rainfall duration, and rainfall kinetic energy. This study explores the importance of typhoons to the spatiotemporal variations in RE, which is crucial for identifying soil erosion risks and formulating prevention and control strategies under extreme climate impacts.

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Data availability

Daily rainfall products from 1960 to 2020 are provided by the National Meteorological Science Data Center (China) (http://data.cma.cn/). GPM precipitation products from 2001 to 2020 are provided by the National Aeronautics and Space Administration (NASA) (http://ww.nasa.gov/). The Tropical Cyclones Best Track Data and Potential Risk Index Dataset from 1960 to 2020 are provided by the China Meteorological Administration Tropical Cyclone Data Center for the western North Pacific Basin (https://tcdata.typhoon.org.cn/).

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Funding

This work was supported by the National Natural Science Foundation of China (No. 42361010); the Guiding Fund Project of Government’s Science and Technology (No. Qian Ke He Zhong Yin Di[2023]005); and the Academic Talent Plan of Guizhou Normal University (No. Qian Shi Xin Miao[2022]B31).

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Contributions

All authors contributed to the study conception and design. Conceptualization: Zhen Cao and Dayun Zhu; material preparation, data collection, and analysis: Zhen Cao, Ronghan Li, and Linjing Fu; writing—original draft: Zhen Cao; data curation: Zhigao Wu and Yingshan Zhao; visualization: Zhen Cao and Zhigao Wu. All authors have read and agreed to the published version of the manuscript.

Corresponding author

Correspondence to Dayun Zhu.

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The authors declare no competing interests.

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Cao, Z., Zhu, D., Li, R. et al. Influence of typhoons on the spatiotemporal variation in rainfall erosivity in the Pearl River Basin. Theor Appl Climatol 155, 1019–1034 (2024). https://doi.org/10.1007/s00704-023-04676-x

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  • DOI: https://doi.org/10.1007/s00704-023-04676-x

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