MRI: Acquisition of a total organic carbon analyzer for undergraduate training and research quantifying how climate-glacier interactions impact land-to-ocean fluxes of carbon

MRI：购买总有机碳分析仪，用于本科生培训和研究，量化气候-冰川相互作用如何影响陆地到海洋的碳通量

• 批准号: 1726177
• 负责人: Jason Fellman
• 金额: $ 5.03万
• 依托单位: University of Alaska Southeast Juneau Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1726177&HistoricalAwards=false
• 关键词: MRI; Acquisition; total; organic; carbon

EAR-1726177FellmanThis grant supports acquisition of a dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) analyzer that will be located in a lab shared by the USFS Pacific Northwest Research Station and the University of Alaska Southeast. Acquisition of this instrument will provide the infrastructure necessary to quantify DOC fluxes from watersheds of varying glacial coverage, thus creating a space-for-time substitution to determine how climate-glacier interactions are driving ecological change in the region. The DOC/TDN analyzer will replace an aging, non-functional instrument that is located off campus and is owned by the USFS. Acquisition of this instrument will allow the investigators to reinvigorate stream biogeochemistry research efforts aimed at understanding the biophysical impacts of glacial change on coastal watersheds in southeast Alaska, facilitate access to the instrument by outside users, and enhance undergraduate training. In particular, the instrument will strengthen the research training opportunities for undergraduates in Environmental Science as well as provide the opportunity to recruit and train members of two groups (rural and Alaska Native students) that are traditionally highly under-represented in the Environmental Sciences.The DOC/TDN analyzer allows for rapid and precise measurement of concentrations of DOC and TDN. Research applications include: 1) determining how climatically-driven changes in snow/rainfall regimes that influence the timing and magnitude of glacial runoff are driving stream water DOC and nutrient fluxes in the region, 2) quantifying the relationship between disinfection byproduct formation, DOC concentrations and precipitation event size in watersheds that currently or may provide drinking water in rural watersheds, 3) testing the use of DOC as a proxy for methylmercury concentrations in forested and wetland-dominated watersheds, and 4) determining how seasonal changes in the movement of water from soils to streams controls the production, speciation and timing of lateral carbon export from forested ecosystems.

EAR-1726177费尔曼这笔赠款支持购买溶解有机碳(DOC)和总溶解氮(TDN)分析仪，该分析仪将位于USFS太平洋西北研究站和阿拉斯加东南大学共享的实验室中。购买该仪器将提供必要的基础设施，以量化来自不同冰川覆盖范围的流域的DOC通量，从而创造一种以空间换时间的方法，以确定气候-冰川相互作用如何推动该地区的生态变化。DOC/TDN分析仪将取代位于校外、由美国食品和药物管理局拥有的老化、不起作用的仪器。这台仪器的购置将使研究人员能够重振旨在了解冰川变化对阿拉斯加东南部沿海集水区生物物理影响的河流生物地球化学研究工作，方便外部用户使用该仪器，并加强本科生培训。特别是，该仪器将加强环境科学本科生的研究培训机会，并提供机会招募和培训两个群体的成员(农村和阿拉斯加原住民学生)，这两个群体在环境科学中的代表性传统上很低。DOC/TDN分析仪允许快速和准确地测量DOC和TDN的浓度。研究应用包括：1)确定影响冰川径流的时间和幅度的气候驱动的雪/降雨制度的变化如何驱动该地区的溪水DOC和营养盐通量；2)量化消毒副产品形成、DOC浓度和降雨事件大小之间的关系；3)测试DOC作为森林和湿地为主的流域中甲基汞浓度的替代指标；以及4)确定水从土壤到溪流的季节性变化如何控制森林生态系统横向碳输出的生产、形态和时间。