Estimation of Watershed Hydrochemical Responses to Future Climate Changes Based on CMIP6 Scenarios in the Tianhe River (China)

The impacts of future climate changes on watershed hydrochemical processes were assessed based the newest Shared Socioeconomic Pathways (SSP) scenarios in Coupled Model Intercomparison Project Phase 6 (CMIP6) Tianhe River middle area China. monthly spatial downscaled outputs General Circulation Models (GCMs) used, and a new Python procedure was developed to batch pick up site-scale change information. A combined modeling approach proposed estimate responses streamflow Total Dissolved Nitrogen (TDN) fluxes four during periods. Long Ashton Research Station Weather Generator (LARS-WG) used generate synthetic daily weather series, which further Regional Nutrient Management (ReNuMa) model for scenario analyses process responses. results showed that there would be 2–3% decreases annual by end this century most except SSP 1-26. More is expected summer months, responding scenarios. TDN continue increase under uncontrolled scenarios, with more non-point source contributions high-flow periods summer. intensities flux increasing emission-controlled relatively moderate, turning point around 2070s, indicating positive policies could effective mitigating processes.