Global mean surface air temperature (SAT) has remained relative stagnant since the late 1990s, a phenomenon known as global warming hiatus. Despite widespread concern and discussion, there is still an open question about whether this hiatus exists, partly due to the biases in observations. The stable isotopic composition of precipitation in mid- and high-latitude continents closely tracks change of the air temperature, providing an alternative to evaluate global warming hiatus. Here we use the long-term precipitation δ¹⁸O records available to investigate changes in SAT over the period 1970–2016. The results reveal slight decline in δ¹⁸O anomaly from 1998 to 2012, with a slope of −0.000 4‰ decade⁻¹ which is significantly different from that of pre-1998 interval This downward δ¹⁸O anomaly trend suggests a slight cooling for about −0.001 oC decade⁻¹, corroborating the recent hiatus in global warming. Our work provides new evidence for recent global warming hiatus and highlights the potential of utilizing precipitation isotope for tracking climate changes.

中文翻译：

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近期全球变暖中断的稳定同位素证据

自1990年代后期以来，全球平均地面气温（SAT）一直保持相对停滞，这种现象被称为全球变暖中断。尽管存在广泛的关注和讨论，但对于这种中断是否存在仍存在一个开放的问题，部分原因是观察上的偏见。中高纬度大陆上稳定的同位素同位素组成密切跟踪着气温的变化，为评估全球变暖的中断提供了一种选择。这里我们使用的长期沉淀δ ^18条Ø提供记录在此期间2070至16年，调查SAT的变化。结果显示在δ略有下降¹⁸ ö异常1998年至2012年，有-0.000 4‰decade的斜率^-1间隔这个向下δ其是从1998年以前的的显著不同¹⁸ ö异常趋势表明轻微的冷却约-0.001摄氏度十年^-1，证实在全球变暖最近裂孔。我们的工作为近期全球变暖的中断提供了新的证据，并强调了利用降水同位素追踪气候变化的潜力。