精品文档---下载后可任意编辑不同时间尺度珠江三角洲大气降水中稳定同位素变化特征及影响因素分析的开题报告【摘要】稳定同位素是一种重要的大气水循环指示物质,其变化特征可以反映气候、环境和人类活动等因素对水循环的影响。珠江三角洲地区是中国南方的一个经济发达地区,大气降水的稳定同位素变化特征及其影响因素讨论对于了解该地区大气水循环和区域水资源管理具有重要意义。本讨论采纳同位素比值分析方法,对珠江三角洲地区不同时间尺度(季节、年)大气降水中稳定同位素变化特征及其影响因素进行讨论。结果表明,珠江三角洲地区大气降水中 δ18O 和 δ2H 的变化特征在季节和年际尺度上均表现出较明显的差异,且受气候变化和人类活动影响明显。其中,气温对大气降水中稳定同位素变化影响较为显著,而人类活动(如城市化、工业化和农业制度转型等)对大气降水稳定同位素的影响也较为显著。【关键词】大气降水;稳定同位素;珠江三角洲;气候变化;人类活动【ABSTRACT】Stable isotopes are an important indicator of the atmospheric water cycle, and their changes can reflect the effects of climate, environment, and human activities on the water cycle. The Pearl River Delta is an economically developed region in southern China. The study of stable isotope variations and their influencing factors in atmospheric precipitation in this area is of great significance for understanding the atmospheric water cycle and regional water resources management. In this study, stable isotope ratio analysis was used to investigate the characteristics of stable isotope variations and their influencing factors in atmospheric precipitation at different time scales (seasonal and annual) in the Pearl River Delta. The results show that the characteristics of δ18O and δ2H variation in atmospheric precipitation in the Pearl River Delta are significantly different at seasonal and interannual scales, and are influenced by climate change and human activities. Among them, temperature has a significant impact on stable isotope variations in atmospheric precipitation, while human activities (such as urbanization, industrialization, and agricultural system transformation) also 精品文档---下载后可任意编辑have a significant impact on stable isotope variations in atmospheric precipitation.【KEY WORDS】atmospheric precipitation; stable isotopes; Pearl River Delta; climate change; human activities.