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Stable water isotopologue ratios in fog and cloud droplets of liquid clouds are not size-dependent

机译：雾和液态云的云滴中稳定的水同位素比率与大小无关

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In this work, we present the first observations of stable water isotopologueratios in cloud droplets of different sizes collected simultaneously. Weaddress the question whether the isotope ratio of droplets in a liquid cloudvaries as a function of droplet size. Samples were collected from a groundintercepted cloud (= fog) during the Hill Cap Cloud Thuringia 2010 campaign(HCCT-2010) using a three-stage Caltech Active Strand Cloud water Collector(CASCC). An instrument test revealed that no artificial isotopicfractionation occurs during sample collection with the CASCC. Furthermore, wecould experimentally confirm the hypothesis that the δ values of clouddroplets of the relevant droplet sizes (μm-range) were notsignificantly different and thus can be assumed to be in isotopic equilibriumimmediately with the surrounding water vapor. However, during the dissolutionperiod of the cloud, when the supersaturation inside the cloud decreased andthe cloud began to clear, differences in isotope ratios of the differentdroplet sizes tended to be larger. This is likely to result from the cloud'sheterogeneity, implying that larger and smaller cloud droplets have beencollected at different moments in time, delivering isotope ratios fromdifferent collection times.
机译：在这项工作中，我们提出了在同时收集的不同大小的云滴中稳定水的同位素的初步观察。我们解决了一个问题，即液态云中液滴的同位素比率是否随液滴大小而变化。在Hill Cap Cloud图林根州2010活动（HCCT-2010）期间，使用三阶段Caltech主动链云集水器（CASCC）从地面截断的云（=雾）中收集了样本。仪器测试显示，在使用CASCC进行样品收集期间没有发生人工同位素分离。此外，我们可以通过实验证实以下假设：相关液滴尺寸（μm范围）的云滴δ值无显着差异，因此可以假定与周围水蒸气立即处于同位素平衡。然而，在云的溶解期中，当云内部的过饱和度降低并且云开始清除时，不同液滴尺寸的同位素比率的差异趋向于更大。这很可能是由于云的非均质性造成的，这意味着在不同的时间点收集了越来越大的云滴，从而从不同的收集时间传递了同位素比率。

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