Seasonal shifts in the solute ion ratios of vadose zone rock moisture from the Eel River Critical Zone Observatory

作     者：Jennifer L.Druhan Nicole Fernandez Jia Wang William E.Dietrich Daniella Rempe 

作者机构：Department of Geology University of Illinois Urbana Champaign Department of Earth and Planetary Science University of California Berkeley Jackson School of Geosciences University of Texas at Austin 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2017年第36卷第3期

页      面：385-388页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the US National Science Foundation Project EAR-1331904 for the Eel River Critical Zone Observatory 

主　　题：Vadose zone Solute ion ratios Critical Zone Observatory Seasonal solute dynamics 

摘      要：One of the greatest challenges in critical zone studies is to document the moisture dynamics, water flux,and solute chemistry of the unsaturated, fractured and weathered bedrock that lies between the soil and groundwater table. The central impediment to quantifying this component of the subsurface is the difficulty associated with direct observations. Here, we report solute chemistry as a function of depth collected over a full year across the shale-derived vadose zone of the Eel River Critical Zone Observatory using a set of novel sub-horizontal wellbores,referred to as the vadose zone monitoring system. The results of this first geochemical glimpse into the deep vadose zone indicate a dynamic temporal and depth-resolved structure. Major cation concentrations reflect seasonal changes in precipitation and water saturation, and normalized ratios span the full range of values reported for the world s largest rivers.