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Spatiotemporal variations of precipitation during the rainy season over the three-rivers headwater region of tibetan plateau from 1990 to 2020

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Abstract

The Three-River Headwater Region (TRHR) has undergone significant hydrological changes and affects the water resources security in the local and downstream areas. We use multiple observational precipitation product, as well as the ERA5 reanalysis dataset to investigate the precipitation variations over the TRHR during the rainy season from 1990 to 2020, and to analyze the contributions of local evaporation and remote water vapor transport to the precipitation and its variations. The precipitation shows a significant increasing trend (17.8 mm decade−1). The precipitation variability (PV) is larger at daily scale and smaller at interannual scale. The spatial distribution of PV varies on different timescales, which reflects the different dominant regimes driving the moisture transport. The mean precipitation in the TRHR is predominantly contributed by western and southern moisture influxes, and the increasing trend of these influxes (10.8 kg s−1 decade−1) determines the precipitation increase. Local evaporation provide about 6% of water vapor for the precipitation, while it has little influence on the precipitation change. The anomalous precipitation in wet and dry years is mainly controlled by the atmospheric circulation over the Tibetan Plateau, which regulates the southwestern moisture transport towards the TRHR. Additionally, the precipitation during 1990–2020 increases by about 3.9% compared to that during 1960–1989. It is related to the higher conversion ratio of water vapor influxes to precipitation and larger evaporation over the TRHR. These findings improve our understanding of the precipitation variations in the TRHR and provide insights for policy makers to optimize water resources management to cope with the global climate change.

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Data availability

The data from the ERA5 reanalysis during this study are openly available from the European Centre for Medium-Range Weather Forecasts at http://cds.climate.copernicus.eu/cdsapp#!/search?type=datasevaporation&text=ERA5. The meteorological station data are openly available from the China Meteorological Administration at http://data.cma.cn/ as cited in Sang et al. (2013). The CMFD precipitation was provided by He et al. (2019) at https://data.tpdc.ac.cn/zh-hans/data/8028b944-daaa-4511-8769-965612652c49/. The TRMM precipitation data are provided from B.Bookhagen at http://www.geog.ucsb.edu/;bodo/TRMM/.

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Funding

This work was supported by the Second Tibetan Plateau Scientific Expedition and Research of China (Grant 2019QZKK0105) and the National Natural Science Foundation of China (Grants 91937301, 41975017 and 41905010).

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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by JZ and QD. The first draft of the manuscript was written by JZ. The manuscript were reviewed and edited by HL and Lujun Xu. All authors read and approved the final manuscript.

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Correspondence to Huizhi Liu.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Zhu, J., Liu, H., Li, Y. et al. Spatiotemporal variations of precipitation during the rainy season over the three-rivers headwater region of tibetan plateau from 1990 to 2020. Clim Dyn 61, 5551–5572 (2023). https://doi.org/10.1007/s00382-023-06870-z

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  • DOI: https://doi.org/10.1007/s00382-023-06870-z

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