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

这笔拨款支持购置一台激光腔衰荡光谱仪（CRDS），用于测量天然水中氢和氧的稳定同位素比率。该仪器将取代俄亥俄州立大学老化且不再受支持的CRDS，并允许继续进行一系列nsf资助的水文学、冰川学和水生生物地球化学研究和培训，这些研究和培训依赖于确定河流、湖泊、冰川融化、降水和冰中的水的来源和循环途径。气候变化对冰川融水依赖地区的影响、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是及时且具有社会相关性的。鉴于教师和学生对水资源、安全和气候动态对区域和全球水循环的影响的研究的重要性，这种支持与国家科学基金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。CRDS允许快速和精确地量化18O/16O和2H/1H的同位素比率，作为已知的随纬度和海拔变化的瑞利分馏模式的水源区域的代表。研究申请将包括但不限于：研究受气候动态影响的南极湖泊、溪流和冰下水的水源以及南美洲和亚洲河流中冰川融水的来源；研究俄亥俄州地下水与地表水的相互作用，并结合水成分的元素研究，以研究城市溪流的地球化学变化对人为活动的反应（例如，道路盐的施用和径流）；以及深盆地盐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.