In order to investigate the spatiotemporal distribution and influencing factors of global precipitation chemistry, we conducted a comprehensive analysis using multiple data sources, revealing the impact of human activities on the natural environment. The results indicate a decreasing trend in global precipitation acidity over the past 20 years. The distribution of global precipitation is influenced by both natural and anthropogenic factors. Alkaline cation concentrations are higher in desert and arid regions, while high concentrations of SO and NO are primarily found in industrial areas, and agricultural areas exhibit higher NH concentrations. Coastal regions have higher Na and Cl concentrations compared to inland areas. However, the increased Na + and Cl concentrations due to inland salinization should not be overlooked. Additionally, influenced by atmospheric circulation, transboundary pollution from South Asia leads to higher SO and NO concentrations in precipitation over the Tibetan Plateau. Meteorological factors have a weaker influence on precipitation chemistry compared to geographical and human activity factors, although ion concentrations in snowfall are higher than in rainfall.

中文翻译：

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全球主要人类活动区域的大气降水化学和环境意义

为了研究全球降水化学的时空分布和影响因素，我们利用多个数据源进行了综合分析，揭示了人类活动对自然环境的影响。结果表明，过去20年全球降水酸度呈下降趋势。全球降水量的分布受自然因素和人为因素的影响。沙漠和干旱地区碱性阳离子浓度较高，而高浓度SO和N2O主要出现在工业区，农业区NH浓度较高。与内陆地区相比，沿海地区的 Na 和 Cl 浓度较高。然而，内陆盐碱化导致的 Na + 和 Cl 浓度增​​加不容忽视。此外，受大气环流影响，来自南亚的跨境污染导致青藏高原降水中SO和NO浓度较高。尽管降雪中的离子浓度高于降雨中的离子浓度，但与地理和人类活动因素相比，气象因素对降水化学的影响较弱。