【摘要】 为探究武夷山脉大气降水稳定氢氧同位素特征及其水汽来源，以武夷山西坡江西马头山森林生态系统观测研究站气象观测场收集的大气降水为研究对象，收集了2023年11月至2024年10月期间降水样品及同期气象资料，进而分析了该地区大气降水稳定氢氧同位素(δD和δ¹⁸O)组成特征及其水汽来源。通过建立当地大气降水线方程来分析降水稳定同位素组成变化及季节特征，分别联合温度、降水量和相对湿度来探讨大气降水的温度效应、降水量效应和湿度效应，分析氘盈余（d-excess）值并结合HYSPLIT后向轨迹模型来模拟当地大气降水水汽来源。结果表明：研究区大气降水稳定同位素具有明显的季节性变化，δD和δ¹⁸O值夏季（6-8月）偏负，冬季（12～次年2月）偏正，d-excess值夏季低于冬季，但其中秋季d-excess值异常偏高，说明局地蒸发占据主导，此时气团也逐步过渡到大陆性气团；当地大气降水线为δD=6.54δ¹⁸O-2.24（R²=0.85,n=85,P<0.01）,表明研究区降水过程中受二次蒸发影响较大，水汽来源复杂，可能受到来自武夷山脉地形因素形成的小范围山地雨影区带来的“温和”雨影效应和焚风效应影响；结合当地气象因子，发现研究区存在着反温度效应和弱降水量效应；运用HYSPLIT后向轨迹模型并结合大气降水线、d-excess值，得出研究区不同季节期间大气降水稳定同位素特征不仅受到复杂的水汽来源影响，还受到当地地形、气象因子的控制。更多还原

【Abstract】 To investigate the characteristics of stable hydrogen and oxygen isotopes in atmospheric precipitation and their moisture sources in the Wuyi Mountains, this study analyzed precipitation samples and concurrent meteorological data collected from the meteorological observation field of the Matoushan National Observation and Research Station of Chinese Forest Ecosystem on the western slope of the Wuyi Mountains from November 2023 to October 2024. The study focused on the composition characteristics of stable hydrogen and oxygen isotopes(δD and δ¹⁸O) in atmospheric precipitation and their moisture sources. The local meteoric water line（LMWL） was established to analyze variations in the stable isotopic composition and seasonal characteristics. The temperature effect, precipitation amount effect, and humidity effect were examined by correlating isotopic values with temperature, precipitation, and relative humidity, respectively. Meanwhile, the deuterium excess（d-excess） values were evaluated and combined with the HYSPLIT backward trajectory model to simulate moisture sources of local atmospheric precipitation. The results indicated that stable isotopes in atmospheric precipitation exhibited significant seasonal variations in the study area. The δD and δ¹⁸O values were more depleted in summer（June-August） and more enriched in winter（December-February）. The d-excess values were lower in summer and higher in winter, with an anomalously high value in autumn, indicating dominant local evaporation and a transitional influence of continental air masses. The LMWL was determined as δD = 6.54δ¹⁸O-2.24（R² = 0.85, n = 85, P < 0.01）, suggesting significant secondary evaporation during precipitation and complex moisture sources. This was likely influenced by localized orographic effects, such as a mild rain shadow and foehn effects in the Wuyi Mountains. Correlation analysis with local meteorological factors identified a significant anti-temperature effect and a weak precipitation amount effect. Using the HYSPLIT backward trajectory model and combined with the LMWL and d-excess values, it was concluded that the stable isotopic characteristics of atmospheric precipitation in different seasons were influenced not only by complex moisture sources, but also by local topography and meteorological factors.更多还原