Collaborative Research: Assessing the response of tropical temperature to global forcings since the Last Glacial Maximum

热带地区是地球的热力引擎，居住着世界上约40%的人口。然而，我们对热带气候如何以及为什么会随着时间发生变化知之甚少。该项目将在乌干达的鲁文佐里山脉建立一个涵盖上一个冰河时代至今的温度记录，以增进对引起热带气候变化的机制和热带在全球气候系统中的作用的了解。鲁文佐里山脉是少数几个可以获得这种长期、客观数据的热带冰川地区之一。该项目将利用两种不同的气候信息来源，包括：1)冰川冰川(标志着以前冰川范围的山脊)的地表暴露年代测定和冰川建模，以及2)湖泊沉积岩芯的化学分析。该项目将需要在乌干达进行实地工作，以收集冰川冰川样本和湖泊沉积物岩心。它将评估热带非洲温度变化与热带南美洲类似重建的关系，以及它们如何与太阳辐射、格陵兰和南极冰盖范围以及大气温室气体浓度的变化相对应。该项目将推动研究过去大约2万年来全球气候是如何运行的。该奖项由古气候变化展望计划和国际科学与工程办公室共同资助。

The tropics are the heat engine of the planet and home to about 40% of the world's population. However, we know very little about how and why tropical climate has changed through time. This project will develop a temperature record in the Rwenzori Mountains of Uganda covering the last ice age to the present to improve the understanding of the mechanisms that cause tropical climate change and the role of the tropics in the global climate system. The Rwenzori Mountains are among the very few glaciated tropical areas where such long-term, objective data can be obtained. This project will utilize two different sources of climate information including: 1) surface exposure dating of glacial moraines (ridges that mark former glacial extents) and glacial modeling, and 2) chemical analyses of lake sediment cores. The project will entail fieldwork in Uganda to collect glacial moraine samples and lake sediment cores. It will evaluate how tropical African temperature changes relate to similar reconstructions in tropical South America, and how they correspond to changes in solar radiation, Greenland and Antarctic ice sheet extents, and atmospheric greenhouse gas concentrations. The project will advance the effort to learn how the global climate worked over the last approximately 20,000 years.This award is cofunded by the Paleo Perspectives on Climate Change Program and the Office of International Science and Engineering.