Acquisition of a Second-Generation Liquid Water Isotope Analyzer for Hydrological, Glaciological, and Geochemical Research

这笔赠款支持购买激光腔衰减式光谱仪(CRDS)，该光谱仪可以测量自然水域中稳定的氢和氧的同位素比率。该仪器将取代俄亥俄州立大学老化的、不再支持的CRDS，并允许继续进行一系列由NSF资助的水文学、冰川学和水生生物地球化学方面的研究和研究培训，这些培训依赖于确定河流、湖泊、冰川融化、降水和冰中水的来源和循环路径。气候变化对依赖冰川的融水地区的影响、美国中西部农业区的水文循环以及水力压裂过程中发生的流体-岩石-气体相互作用的性质的研究具有及时和社会意义。这一支持与NSFs促进科学进步和促进国家健康、繁荣和福利的使命是一致的，因为教师和学生研究的重点是水资源、安全和气候动态对区域和全球水循环的影响。CRDS允许快速和精确地量化18O/16O和2H/1H的同位素比率，作为水源地区的代理，给定已知的瑞利分馏模式，该模式随着纬度和海拔的变化而变化。研究应用将包括但不限于：研究南极湖泊、溪流和冰川下水域的水源以及受气候动态影响的南美洲和亚洲河流中冰川补给融化水的来源；俄亥俄州地下水-地表水相互作用的研究，以及水成分的元素研究，以研究城市溪流因人类活动(如道路盐的应用和径流)而发生变化的地球化学；以及深盆地卤水的地球化学和同位素研究。

This grant supports acquisition of a laser cavity ring down spectrometer (CRDS) tuned to measure stable isotopic ratios of hydrogen and oxygen in natural waters. The instrument would replace an aging and no longer supported CRDS at Ohio State University and allow for continuation of a range of NSF-funded research and research training in hydrology, glaciology, and aquatic biogeochemistry that relies on determination of the sources and cycling pathways of waters in rivers, lakes, glacial melt, precipitation, and ice. Studies of the effects of changing climate on glacier-fed meltwater dependent regions, the hydrological cycle of agricultural regions of the American Midwest and the nature of fluid-rock-gas interactions that occur during hydraulic fracturing are timely and societally relevant. This support is congruent with NSFs mission of promoting the progress of science and advancing the national health, prosperity and welfare given the importance of faculty and student research focused on water resources, security and the effects of climate dynamics on regional and global water cycling.CRDS allow for rapid and precise quantification of the isotope ratios of 18O/16O and 2H/1H as a proxy of water source regions given known Rayleigh fractionation patterns that vary as a function of latitude and elevation. Research applications will include but are not limited to; study of the water sources of Antarctic lakes and streams and subglacial waters and the sources of glacier fed melt waters in streams of South America and Asia that are being impacted by climate dynamics; studies of ground water-surface water interaction in Ohio in conjunction with elemental studies of water composition to study the changing geochemistry of urban streams in response to anthropogenic activity (e.g., road salt application and run off); and geochemical and isotopic studies of deep basinal brines.