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Regional climate modeling to understand Tibetan heating remote impacts on East China precipitation

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Abstract

The Tibetan Plateau, as a major elevated heat source, plays a critical role in the Asian monsoon and global climate. Observational data revealed significant correlations between spring surface air temperature in the Tibetan Plateau and downstream summer precipitation interannual variations. Sensitivity experiments using the regional Climate-Weather Research and Forecasting model (CWRF) were conducted to understand the physical processes and mechanisms underlying such delayed teleconnections. A positive temperature forcing was imposed over the plateau on the surface and subsurface soil layers only at the initial conditions around May 1st, 2003. This regional forcing quickly induces positive perturbations in local air temperature and, more importantly, maintains its signal in local soil, especially deep layers, for several months. Consequently, the soil temperature serves as a charged capacitor to modulate the planetary atmospheric circulation and through Rossby wave chains to cause significant summer precipitation anomalies over broad regions. This relayed teleconnection pattern is consistent with that identified from observational data records and CWRF climate simulations during 1980–2015. Diagnostic analyses of observations and simulations suggest that the Tibetan Plateau heating significantly impacts summer East Asian monsoon climate through influencing the South Asian High and shifting the East Asian jet.

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Data availability

Observational data and model simulations used in this study are accessible online (ftp://earthserver.umd.edu/pub/TP_heating).

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Acknowledgements

The research was supported by the U.S. National Science Foundation Innovations at the Nexus of Food, Energy and Water Systems under Grant EAR1903249 and the China Meteorological Administration/National Climate Center research subcontract 2211011816501. The simulations and analyses were conducted on computers in the Maryland Advanced Research Computing Center and the National Center for Atmospheric Research Computational and Information Systems Lab.

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Prof. Xin-Zhong Liang have National Science Foundation (EAR1903249), China Meteorological Administration (2211011816501).

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Correspondence to Xin-Zhong Liang.

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Xu, H., Liang, XZ. & Xue, Y. Regional climate modeling to understand Tibetan heating remote impacts on East China precipitation. Clim Dyn 62, 2683–2701 (2024). https://doi.org/10.1007/s00382-022-06266-5

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  • DOI: https://doi.org/10.1007/s00382-022-06266-5

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