ESH - Completion of a North-South Transect of Glacial Paleotemperatures Along the Americas Derived from Noble Gases Dissolved in Groundwater

9706467 Stute 古气候研究的关键问题之一是两个半球的对称程度和气候变化的机制。 我们计划通过改善南美洲末次冰期的大陆气候记录来解决这个问题。 我们将主要使用溶解在 14C 定年地下水中的大气稀有气体浓度，作为气候变化的档案。 我们请求资金用于收集和评估南美洲两个地下水流系统（巴西的博图卡图含水层和阿根廷的巴伊亚布兰卡含水层）的地球化学数据（He、Ne、Ar、Kr、Xe、14C、13C、D、18O、34S、3H 和主要溶解离子）。 这些含水层的稀有气体古温度记录将为南美洲过去 35,000 年的古温度提供定量重建。 这两项记录将根据地下水流系统中存档的“稀有气体温度”完成美洲冰川古温度南北横断面。 该样线将（1）使我们能够解决长期气候变化的半球间对称性，（2）为目前使用的古气候代理提供更坚实的基础，（3）帮助我们更好地了解北半球和南半球之间气候变化的耦合。 这项工作通过 PAGES 的子计划 PEP I 直接为 IGBP 的目标做出贡献。 此外，我们请求资金用于研究稀有气体测温的一些新方法学方面，这些方法已记录在我们之前的古气候研究框架中。

9706467 Stute One of the key questions in paleoclimate research is the degree of symmetry and the mechanisms of climate change on both hemispheres. We plan to address this issue by improving the continental climate record for the last glacial period in South America. We will primarily use the concentrations of atmospheric noble gases dissolved in 14C dated groundwater which is used as archive of climate change. We request funds for collection and evaluation of geochemical data (He, Ne, Ar, Kr, Xe, 14C, 13C, D, 18O, 34S, 3H and major dissolved ions) from two groundwater flow systems in South America, the Botucatu aquifer in Brazil, and the Bahia Blanca aquifer in Argentina. Noble gas paleotemperature records from these aquifers will provide quantitative reconstruction of paleotemperatures for South America covering the past 35,000 years. These two records will complete a glacial paleotemperature north-south transect along the Americas based on 'noble gas temperatures' archived in groundwater flow systems. The transect will (1) allow us to address the interhemipheric symmetry of long-term climate change, (2) provide a firmer footing for presently used paleoclimatic proxies, and (3) help us to better understand the coupling of climate change between the northern and southern hemispheres. This work contributes directly to the goals of IGBP through PEP I, a subprogram of PAGES. Additionally, we request funds for studies of some new methodological aspects of noble gas thermometry which were documented in the framework of our previous paleoclimate studies.