Abstract Sixty years of monthly data series of δ18O in precipitation revealed distinctive decadal long-term patterns and break points for the isotope composition of global precipitation. Our results showed that at the multi-decadal scale, δ18O in precipitation displayed changes due to large-scale hydroclimate processes, and particularly, from atmospheric oscillations. Break point and segmented regression trend analyses for δ18O and air temperature revealed influences of the North Atlantic Oscillation (NAO) on the long-term isotope variability for most continental stations in Northern Hemisphere. Long-term trends of δ18O and precipitation amount for Southern Hemisphere stations were mostly indicative of changes in regional hydroclimate processes driven by the larger scale Atlantic and Pacific atmospheric oscillations. For oceanic island stations, the δ18O variations could be described by sinusoidal trends with a ~ 20–40 years-time cycle and δ18O amplitude of ~1–2‰, suggesting these stations have a higher sensitivity to multi-decadal atmospheric circulation. Our findings reveal that coordinated long-term monitoring of stable isotopes in precipitation, coupled with basic meteorological parameters such as air temperature and precipitation amount, are essential to better understand the impact of larger scale hydroclimate variation on regional and local climate variability, and to help interpret long-term hydroclimatic changes of the past, present and future.

中文翻译：

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全球降水中δ18O 60年趋势揭示大尺度水文气候变化

摘要 60 年降水中δ18O 月度数据序列揭示了全球降水同位素组成的独特年代际长期模式和断点。我们的结果表明，在多年代际尺度上，降水中的 δ18O 显示出由于大规模水文气候过程，特别是大气振荡引起的变化。δ18O 和气温的断点和分段回归趋势分析揭示了北大西洋涛动 (NAO) 对北半球大多数大陆站的长期同位素变化的影响。南半球台站δ18O和降水量的长期趋势主要表明由更大规模的大西洋和太平洋大气振荡驱动的区域水文气候过程的变化。对于大洋岛站，δ18O 变化可以用~20-40 年时间周期的正弦趋势和~1-2‰ 的δ18O 幅度来描述，表明这些站点对多年代际大气环流具有更高的敏感性。我们的研究结果表明，对降水中稳定同位素的长期协调监测，加上气温和降水量等基本气象参数，对于更好地了解更大规模的水文气候变化对区域和局地气候变率的影响至关重要，并有助于解释过去、现在和未来的长期水文气候变化。