Continental scale variation in 17O-excess of meteoric waters in the United States
Continental scale variation in 17O-excess of meteoric waters in the United States
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DOI：
10.1016/j.gca.2015.04.047
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发表时间：
2015-09-01
影响因子：
5
通讯作者：
Chesson, Lesley A.
中科院分区：
文献类型：
--
作者：
Li, Shuning;Levin, Naomi E.;Chesson, Lesley A.
高精度的沃茨三重氧同位素分析是水文和古气候研究中的新兴工具。关于沃茨中O-17过量的现有研究包括对大气沃茨的调查以及对高纬度降雪和热带风暴的区域特定研究。然而，需要更好地了解O-17-过量的沃茨跨越大的地理区域的变化，以扩大三重氧同位素测量的效用。在这里，我们提供了美国大陆自来水沃茨中O-17过量的数据，我们用它来代替降水量。自来水沃茨的O-17-过量值范围为-6至+43/meg，平均值为17 +/- 11/meg，低于全球大气沃茨报告的O-17-过量平均值，但与热带降雨报告的O-17-过量值重叠。我们在美国西北部的自来水沃茨中观察到了相对较高的O-17-过量值（>25/meg），而一些最低的O-17-过量值（
High-precision triple oxygen isotope analysis of waters is an emerging tool in hydrological and paleoclimate research. The existing research on O-17-excess in waters includes surveys of meteoric waters and region-specific studies of high-latitude snow and tropical storms. However, a better understanding of the variation in O-17-excess of waters across large geographic regions is needed to expand the utility of triple oxygen isotope measurements. Here we present O-17-excess data from tap waters across the continental U.S., which we used as a proxy for precipitation. The O-17-excess values of tap waters ranged from -6 to +43 per meg and averaged 17 +/- 11 per meg which is lower than the average O-17-excess reported for global meteoric waters, but overlaps with reported O-17-excess values of rainfall from the tropics. We observed relatively high O-17-excess values (>25 per meg) of tap waters in the northwestern U.S. and some of the lowest O-17-excess values (