Tian Chao, Wang Lixin
Department of Earth Sciences, Indiana University-Purdue University Indianapolis (IUPUI), Indianapolis, IN 46202, USA.
Sci Data. 2019 Feb 19;6:190018. doi: 10.1038/sdata.2019.18.
Stable isotopes of hydrogen and oxygen (δH, δO and δO) serve as powerful tracers in hydrological investigations. To our knowledge, daily precipitation isotope record especially O-excess is rare in the mid-latitudes. To fill such knowledge gap, daily precipitation samples (n=446) were collected from June 2014 to May 2018 in Indianapolis, Indiana, U.S. A Triple Water Vapor Isotope Analyzer (T-WVIA) based on Off-Axis Integrated Cavity Output Spectroscopy (OA-ICOS) technique was used to concurrently measure precipitation isotopic variations (δH, δO and δO). Meanwhile, O-excess and d-excess as second-order isotopic variables were calculated to provide additional information on precipitation formation and transport mechanisms. This study presents a four-year daily precipitation isotope dataset for mid-latitudes, and makes it available to researchers around the world who may use it as a reference for site comparisons and for assessing global hydrological models.
氢和氧的稳定同位素（δH、δO和δO）在水文调查中是强大的示踪剂。据我们所知，在中纬度地区，每日降水同位素记录尤其是过剩氧是罕见的。为了填补这一知识空白，于2014年6月至2018年5月在美国印第安纳州印第安纳波利斯采集了每日降水样本（n = 446）。基于离轴积分腔输出光谱（OA - ICOS）技术的三重水汽同位素分析仪（T - WVIA）被用于同时测量降水同位素变化（δH、δO和δO）。同时，计算过剩氧和氘过剩作为二阶同位素变量，以提供关于降水形成和输送机制的额外信息。本研究展示了一个为期四年的中纬度地区每日降水同位素数据集，并将其提供给世界各地的研究人员，他们可以将其用作站点比较和评估全球水文模型的参考。
