Abstract
During the recent decades, summer precipitation has increased over the western and northeastern Tibetan Plateau (TP) and decreased over the southeastern TP. This study investigates the effects of anthropogenic forcing and internal variability on summer rainfall changes over the TP during 1979–2013. It is shown that the variations in atmospheric circulation and precipitation over the TP are largely contributed by the anthropogenic forcing and oceanic boundary conditions and that the Interdecadal Pacific Oscillation (IPO) plays an important role in TP summer rainfall changes in recent decades. The anthropogenic forcing contributes to the drying trends over the southeastern TP and the wetting trends over the western and northeastern TP. The negative sea surface temperature (SST) anomalies in the tropical central-eastern Pacific induce a wave train consisting of anomalous cyclones and anticyclones over Eurasia. The anomalous anticyclone to the northeast TP weakens westerlies, facilitating the convergence of water vapor over the TP. Further analysis indicates that the IPO-related SST anomalies contribute partly to the uncertainty in simulations of summer rainfall changes over the TP in recent decades using a 40-member ensemble of the Community Earth System Model. Consequently, the IPO can be used as one of the predictive factors of the near-term TP summer rainfall projection.
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Acknowledgements
We appreciate the comments of three anonymous reviewers. This study is supported by the Second Tibetan Plateau Scientific Expedition and Research Program (2022QZKK0101, 2019QZKK1001). All CESM1 simulations are available on earthsystemgrid.org. The CMA station data were obtained from the National Meteorological Information Center (http://data.cma.cn/). The CMFD dataset was provided by the National Tibetan Plateau Data Center (http://data.tpdc.ac.cn/en/). The ERA5 reanalysis data were obtained from https://cds.climate.copernicus.eu/#!/home. The GPCC precipitation data were obtained from https://psl.noaa.gov/data/gridded/data.gpcc.html.
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Ding, Z., Zhai, P. & Wu, R. Recent change in summer rainfall over the Tibetan Plateau: roles of anthropogenic forcing and internal variability. Clim Dyn 61, 1887–1902 (2023). https://doi.org/10.1007/s00382-023-06661-6
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DOI: https://doi.org/10.1007/s00382-023-06661-6