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首页> 美国卫生研究院文献>Scientific Reports >Arctic cyclone water vapor isotopes support past sea ice retreat recorded in Greenland ice
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Arctic cyclone water vapor isotopes support past sea ice retreat recorded in Greenland ice

机译：北极气旋水蒸气同位素支持格陵兰冰上记录的过去海冰退缩

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摘要

Rapid Arctic warming is associated with important water cycle changes: sea ice loss, increasing atmospheric humidity, permafrost thaw, and water-induced ecosystem changes. Understanding these complex modern processes is critical to interpreting past hydrologic changes preserved in paleoclimate records and predicting future Arctic changes. Cyclones are a prevalent Arctic feature and water vapor isotope ratios during these events provide insights into modern hydrologic processes that help explain past changes to the Arctic water cycle. Here we present continuous measurements of water vapor isotope ratios (δ18O, δ2H, d-excess) in Arctic Alaska from a 2013 cyclone. This cyclone resulted in a sharp d-excess decrease and disproportional δ18O enrichment, indicative of a higher humidity open Arctic Ocean water vapor source. Past transitions to warmer climates inferred from Greenland ice core records also reveal sharp decreases in d-excess, hypothesized to represent reduced sea ice extent and an increase in oceanic moisture source to Greenland Ice Sheet precipitation. Thus, measurements of water vapor isotope ratios during an Arctic cyclone provide a critical processed-based explanation, and the first direct confirmation, of relationships previously assumed to govern water isotope ratios during sea ice retreat and increased input of northern ocean moisture into the Arctic water cycle.
机译：北极迅速变暖与重要的水循环变化有关：海冰的流失，大气湿度的增加，多年冻土的融化以及水诱导的生态系统的变化。了解这些复杂的现代过程对于解释古气候记录中保存的过去的水文变化以及预测未来的北极变化至关重要。旋风是北极普遍存在的特征，在这些事件中水汽的同位素比提供了对现代水文过程的深入了解，有助于解释北极水循环的过去变化。在这里，我们介绍了2013年飓风中北极阿拉斯加水蒸气同位素比（δ 18 O，δ 2 H，d-过量）的连续测量。该旋风导致d过量急剧下降，δ 18 O比例失调，表明北冰洋开放水汽源的湿度较高。根据格陵兰岛冰芯记录推断的过去向温暖气候的转变也显示出d-过量的急剧下降，假设这代表海冰范围减小和海洋湿度源增加到格陵兰冰盖降水。因此，北极旋风期间水汽同位素比的测量提供了一个基于处理的关键解释，并且首次直接证实了先前假定的关系，这些关系决定着海冰撤退期间以及北半球水分向北极水的输入量增加时的水同位素比。周期。

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