This study quantitatively analyzed the contribution rate of recycled moisture to precipitation in the basin based on the Craig-Gordon model and the three-end-member mixing model through selecting 456 precipitation sample data collected from six sampling points in the source region of the Yellow River from September 2019 to August 2021. The results showed that: the contribution rate of moisture recycling to precipitation during the growing season is 40 %, and the total contribution to local moisture recycling is equivalent to 41 mm of precipitation. The contribution rate of evaporation and transpiration has obvious seasonal variation characteristics, showing a trend of decreasing first and then increasing in the source region of the Yellow River. Spatially, the contribution rate of evaporation and transpiration showed an increasing trend from south to north. It is assumed that all the precipitation generated by moisture recycling produces runoff, and the water yield is about 51 × 108 m3, which is 25 % of the total annual average runoff. In addition, the proportion of local moisture recirculation is mainly related to altitude, topography, vegetation coverage, and meteorological factors. Moisture recirculation is one of the important sources of precipitation in the source region of the Yellow River.

中文翻译：

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水分循环对寒冷地区降水贡献的定量分析


本研究选取 2019 年 9 月至 2021 年 8 月黄河源区 6 个采样点采集的 456 份降水样本数据，基于 Craig-Gordon 模型和三端元混合模型，定量分析了流域循环水分对降水的贡献率。结果表明：生长季水分循环对降水的贡献率为 40 %，对局部水分循环的总贡献相当于 41 mm 的降水。蒸发蒸腾贡献速率具有明显的季节变化特征，在黄河源区呈现先下降后上升的趋势。在空间上，蒸发和蒸腾的贡献率呈由南向北增加的趋势。假设水分循环产生的所有降水都产生径流，产水量约为 51 × 108 m3，占年平均径流总量的 25%。此外，局地水汽再循环的比例主要与海拔、地形、植被覆盖度和气象因子有关。水汽再循环是黄河源区重要的降水来源之一。