From May 2014 to September 2018, a laser spectrometer analyzer provided a 4.5 years continuous record of water vapor isotopic composition at Ny‐Ålesund (8 m above sea level, a.s.l.), Svalbard. It corresponds to the longest data set published in polar regions. A comparison of this data set with a parallel similar data set obtained during 20 days by a second laser spectrometer installed near Mount Zeppelin (474 m a.s.l.) shows that this data set is representative of a regional signal. In addition, the observation of insignificant diurnal cycles in the isotopic signal compared to the strong isotopic signature of synoptic events and the comparison of simultaneous measurements in the vapor and in rain or snow samples lead to the conclusion that our record reflects a large part of the regional dynamics of the atmospheric water cycle driven by large‐scale variability. This study focuses on winters dominated by the occurrence of synoptic events associated with humidity peaks. Using statistics and back trajectories calculations, we link high humidity peaks characterized by an anticorrelation between δ¹⁸O and d‐excess in the water vapor to a rapid shift of air mass source regions from the Arctic to the North Atlantic Ocean below 60°N. On the other hand, correlation between δ¹⁸O and d‐excess may be associated with a shift of air mass sources within the Arctic. These results demonstrate the added value of long‐term water vapor isotopic monitoring to better understand the moisture origin in the Arctic and the atmospheric dynamics.

中文翻译：

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斯瓦尔巴群岛水蒸气同位素组成的4.5年记录记录了冬季空气质量起源

从2014年5月到2018年9月，激光光谱仪分析仪在斯瓦尔巴特群岛Ny-Ålesund（8 m asl）连续记录了4.5年的水蒸气同位素组成。它对应于在极地地区发布的最长的数据集。该数据集与安装在齐柏林飞艇（474 m asl）附近的第二台激光光谱仪在20天之内获得的平行相似数据集的比较表明，该数据集代表了区域信号。此外，与天气事件的强同位素特征相比，观测到的同位素信号无明显的昼夜循环，同时对蒸气，雨水和雪样中的同时测量值进行比较，得出的结论是，我们的记录反映了大部分大尺度变化驱动的大气水循环区域动态。这项研究的重点是与湿度峰值有关的天气事件主导的冬季。使用统计数据和反向轨迹计算，我们可以将高湿度峰链接在一起，这些峰的特征在于δ之间的反相关¹⁸ O和过量的水蒸气导致空气质量源区域从北极迅速转移到60°N以下的北大西洋。在另一方面，δ之间的相关性¹⁸ O和d-过量可与北极内的气团源移位相关联。这些结果证明了长期水蒸气同位素监测的附加价值，可以更好地了解北极的水分起源和大气动力学。