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

小行星9706467 古气候研究的关键问题之一是南北半球气候变化的对称程度和机制。 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测年的地下水中的大气惰性气体浓度，该地下水用作气候变化的档案。 我们请求提供资金，用于收集和评价南美洲两个地下水流系统（巴西博图卡图含水层和阿根廷巴伊亚布兰卡含水层）的地球化学数据（He、Ne、Ar、Kr、Xe、14 C、13 C、D、18 O、34 S、3H和主要溶解离子）。 来自这些含水层的稀有气体古温度记录将提供南美洲过去35，000年古温度的定量重建。 这两个记录将完成一个冰川古温度南北样带沿着美洲的基础上'惰性气体温度'存档在地下水流系统。 样带将（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方和南半球之间的气候变化耦合。 这项工作通过PEP I（PAGES的一个子程序）直接促进IGBP的目标。 此外，我们还要求提供资金，用于研究惰性气体温度测量的一些新方法，这些方法在我们以前的古气候研究框架中已有记载。

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.