The lower Jinsha River Basin is situated in a region impacted by dry and hot valley climate.Atmospheric precipitation plays a pivotal role in the hydrological dynamics of the basin.We scrutinized the seasonal fluctuation patterns of stable isotopic composition in precipitation within the basin,and identified its influencing factors.Fur-thermore,employing isotope tracing techniques alongside the HYSPLIT(Hybrid-Single Particle Lagrangian Inte-grated Trajectory)model,we elucidated the sources of atmospheric precipitation in the area.Findings reveal dis-tinctive seasonal trends in isotopic values,with negative values of δ2H and δ18O observed during rainy season and positive values in dry season.Temperature and rainfall emerge as primary influencers on the isotopic composition of local precipitation,while elevation exerts minimal impact.Notably,the local meteoric water line exhibits lower slope and intercept values compared to global and Chinese atmospheric precipitation lines,primarily due to non-e-quilibrium evaporation effects.Moisture sourcing analysis indicates a similarity between the precipitation origins in lower Jinsha River Basin and those in Kunming.Rainfall during the rainy season predominantly stems from the southwest and south Asian monsoons,while dry season precipitation potentially results from the westerly belt or po-lar continental air masses.These research outcomes are of substantial significance for understanding regional hydro-logical cycle within the lower Jinsha River Basin.
关键词
大气降水/氢氧稳定同位素组成/影响因素/水汽来源/金沙江下游流域
Key words
atmospheric precipitation/composition of hydrogen and oxygen stable isotopes/influence factors/at-mospheric moisture source/the Lower Jinsha River Basin
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