Abstract
Understanding the impacts of climate change on water quality and stream flow is important for management of water resources and environment. Miyun Reservoir is the only surface drinking water source in Beijing, which is currently experiencing a serious water shortage. Therefore, it is vital to identify the impacts of climate change on water quality and quantity of the Miyun Reservoir watershed. Based on long-time-series data of meteorological observation, future climate change scenarios for this study area were predicted using global climate models (GCMs), the statistical downscaling model (SDSM), and the National Climate Centre/Gothenburg University—Weather Generator (NWG). Future trends of nonpoint source pollution load were estimated and the response of nonpoint pollution to climate change was determined using the Soil and Water Assessment Tool (SWAT) model. Results showed that the simulation results of SWAT model were reasonable in this study area. The comparative analysis of precipitation and air temperature simulated using the SDSM and NWG separately showed that both tools have similar results, but the former had a larger variability of simulation results than the latter. With respect to simulation variance, the NWG has certain advantages in the numerical simulation of precipitation, but the SDSM is superior in simulating precipitation and air temperature changes. The changes in future precipitation and air temperature under different climate scenarios occur basically in the same way, that is, an overall increase is estimated. Particularly, future precipitation will increase significantly as predicted. Due to the influence of climate change, discharge, total nitrogen (TN) and total phosphorus (TP) loads from the study area will increase over the next 30 years by model evaluation. Compared to average value of 1961 ~ 1990, discharge will experience the highest increase (15%), whereas TN and TP loads will experience a smaller increase with a greater range of annual fluctuations of 2021 ~ 2050.
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Data source from http://www.ipcc.ch/.
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Acknowledgements
This study is funded by the National Natural Science Foundation of China (41271495) and Capacity Building for Sci-Tech Innovation—Fundamental Scientific Research Funds (025185305000/149). The authors would also like to thank the two anonymous reviews for their valuable comments, which markedly improved this manuscript.
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Wang, X., Li, Z. & Li, M. Impacts of climate change on stream flow and water quality in a drinking water source area, Northern China. Environ Earth Sci 77, 410 (2018). https://doi.org/10.1007/s12665-018-7581-5
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DOI: https://doi.org/10.1007/s12665-018-7581-5