(ESH) Glacial Paleotemperatures for the Continental Tropics Derived from Noble Gases Dissolved in Groundwater

9506425斯图尔特古气候研究中的关键问题之一是从今天到最后一次冰川盛期(LGm)之间热带表面温度的变化程度。大多数海洋表面温度记录表明冰川/间冰期温度变化较小(1摄氏度)，而大陆记录表明温度变化相当大。这一冲突的解决对于可靠地重建过去和预测未来的气候变化至关重要。我们计划通过改善热带低海拔地区的大陆气候记录来解决这个问题，在这个阶段，热带大陆气候记录的数量低于海洋表面温度记录。我们将利用地下水中溶解的大气惰性气体浓度作为古温度计(‘惰性气体温度计’)和承压含水层作为气候变化的档案。我们请求提供资金，用于收集和评估来自热带两个地下水流动系统的地球化学数据(He、Ne、Ar、Kr、Xe、14C、13C、D、18O 34 S和主要溶解离子)，这两个系统分别是越南南部的湄公河三角洲含水层和厄瓜多尔的里奥瓜亚斯含水层。来自这些含水层的稀有气体古温度记录将有助于定量重建过去30,000年来热带大陆的古温度记录。含水层位于低于100aaaaam a.s.l的高度。靠近太平洋的东海岸和西海岸。因此，从这些含水层获得的记录将使我们能够直接比较上一次冰川期间的大陆和海洋古温度。

9506425 Stute One of key questions in paleoclimate research is the degree of change in tropical surface temperatures between today and the last glacial maximum (LGM). Most sea surface temperature records suggest small (1oC) glacial/interglacial temperature changes, while continental records indicate considerably larger temperature changes. A resolution of this conflict is crucial for a reliable reconstruction of past and prediction of future climate change. We plan to address this issue by improving the continental climate record in the tropics at low altitude, which at this stage is less quantitative than the sea surface temperature record. We will use the concentrations of atmospheric noble gases dissolved in groundwater as paleothermometer ('noble gas thermometer') and confined aquifer as archive of climate change. We request funds for collection and evaluation of geochemical data (He, Ne, Ar, Kr, Xe, 14 C, 13 C, D , 18 O 34 S and major dissolved ions) from two groundwater flow systems in the tropics, the Mekong Delta aquifers in southern Vietnam and the Rio Guayas aquifers in Ecuador. Noble gas paleotemperature records from these aquifers will allow quantitative reconstruction of paleotemperature records for the continental tropics covering the past 30,000 years. The aquifers are located at altitudes less than 100 aaaaam a.s.l. and close to the eastern and western coasts of the Pacific. The records obtained from these aquifers will therefore allow us to directly compare continental and oceanic paleotemperatures during the last glaciation.