The Local Meteoric Water Line (LMWL) is essential for understanding local hydrological processes through stable isotopes in precipitation.
A nine-year study in Changwu Tableland assessed how different time frames (annual, monthly, event-based) and regression methods (OLS, MA, RMA) impact the established LMWL, revealing stable results for annual data and significant variations for monthly and event data.
The research emphasizes careful selection of data scale and regression methods to ensure accurate LMWL establishment, particularly in regions with varied precipitation characteristics, recommending the use of precipitation-weighted regression methods when data is limited.