Regional isotope effects and application to hydrologic investigations in southwestern California
Regional isotope effects and application to hydrologic investigations in southwestern California
复制标题
区域同位素效应及其在加利福尼亚州西南部水文调查中的应用
DOI：
10.1029/97wr01035
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发表时间：
1997
影响因子：
5.4
通讯作者：
Daniel P. Rodoni
中科院分区：
文献类型：
--
作者：
Alan E. Williams;Daniel P. Rodoni
加利福尼亚州西南部本地和进口的地表水和地下水的稳定同位素组成为评估各种水文和气象问题提供了定量背景。加利福尼亚州西南部海洋性气候区受地理控制的大气水同位素比变化显示出最适合的 δD 依赖于纬度（-2.0‰/度）、内陆距离（-21‰/100 公里）和海拔（-10‰/公里）。流星和蒸发分馏提供了独特的同位素特征，可以追踪输送的水，以及识别当地沉淀的流域。蒸发和大气同位素分馏趋势的区域框架可以解释圣哈辛托地区的当地补给和地下水文。类似的技术可以应用于加利福尼亚州西南部的其他地区，这些地区的不同源头流域、地表或地下输送以及混合导致地下水同位素组成的显着变化。
Stable isotopic compositions of locally derived and imported surface and groundwaters in southwestern California provide a quantitative background for assessment of a variety of hydrologie and meteorologie questions. Geographically controlled meteoric water isotope‐ratio variations in the maritime climate zone of southwestern California show best fit δD dependence on latitude (−2.0‰ per degree), distance inland (−21‰ per 100 km), and elevation (−10‰ per kilometer). Meteoric and evaporative fractionations provide distinctive isotopic signatures that permit tracing of transported waters, as well as identification of watersheds for those precipitated locally. This regional framework of evaporative and meteoric isotope fractionation trends permits interpretation of local recharge and subsurface hydrology in the San Jacinto region. Similar techniques may be applied to other regions in southwestern California where differing source watersheds, surface or subsurface transport, and mixing provide significant variations in groundwater isotopic composition.