Hydrol. Earth Syst. Sci., 24, 5439–5451, 2020 https://doi.org/10.5194/hess-24-5439-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Accelerated hydrological cycle over the Sanjiangyuan region induces more streamflow extremes at different global warming levels Peng Ji1,2, Xing Yuan3, Feng Ma3, and Ming Pan4 1Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 2College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China 3School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China 4Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey, USA Correspondence: Xing Yuan (
[email protected]) Received: 7 July 2020 – Discussion started: 24 July 2020 Revised: 12 October 2020 – Accepted: 13 October 2020 – Published: 20 November 2020 Abstract. Serving source water for the Yellow, Yangtze and tance of ecological processes in determining future changes Lancang-Mekong rivers, the Sanjiangyuan region affects 700 in streamflow extremes and suggests a “dry gets drier, wet million people over its downstream areas. Recent research gets wetter” condition over the warming headwaters. suggests that the Sanjiangyuan region will become wetter in a warming future, but future changes of streamflow ex- tremes remain unclear due to the complex hydrological pro- cesses over high-land areas and limited knowledge of the in- 1 Introduction fluences of land cover change and CO2 physiological forc- ing. Based on high-resolution land surface modeling dur- Global temperature has increased at a rate of 0.17◦C per ing 1979–2100 driven by the climate and ecological projec- decade since 1970, contrary to the cooling trend over the past tions from 11 newly released Coupled Model Intercompari- 8000 years (Marcott et al., 2013).