A one-million record of orbital-scale changes in temperature and precipitation from the Indo-Pacific Warm Pool

印度太平洋暖池轨道尺度温度和降水变化的一百万条记录

• 批准号: 2102856
• 负责人: James Russell
• 金额: $ 39.97万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-06-15 至 2024-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2102856&HistoricalAwards=false
• 关键词: million; record; orbital; scale; changes

Tropical climate is changing rapidly – rainfall events are becoming more intense, and droughts more severe. These changes affect the affect the lives of billions of people who rely on rainfall for their livelihoods, and have important implications for the world due to connections between tropical and global climates. Predicting how rainfall and temperature will change in the future requires long records to test climate models and theory. Such records are generally scarce in the tropics, and particularly in the tropical western Pacific, where existing records disagree substantially on the pattern and magnitude of past changes in climate. The goal of this project is to develop new records of temperature, rainfall, and vegetation from the tropical western Pacific, a region that is especially important to global climate processes, and to investigate their causes. This research will enable us to test theories of tropical and global climate change, and thereby to improve the prediction of future climates in this region. The project will provide for many opportunities for US graduate and undergraduate students to conduct research and will develop new classroom modules on climate change to be used in the Providence Public School System.This research will investigate orbital-scale variations in rainfall, temperature, and vegetation during the past 1.1 million years in the Indo-Pacific Warm Pool (IPWP) through analysis of recently-recovered sediment drill cores from Lake Towuti, located on Sulawesi Island in central Indonesia. Through organic geochemical analyses of these sediments, the project will evaluate the impacts of changes in tropical seasonal insolation, high-latitude ice volume, temperature, and atmospheric greenhouse gas concentrations, and sea level on IPWP climate across critical transitions in global climate boundary conditions. The research will focus on global climate transitions during the Mid-Pleistocene, 800,000 years ago, when glacial-interglacial variability transitioned from predominantly 41-kyr to 100-kyr ice-age cycles, and 430,000, when the 100-kyr cycles intensified. The results are expected to contribute to understanding how tropical climates change in response to climate boundary conditions that differ from the present day.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

热带气候正在迅速变化——降雨事件变得更加强烈，干旱更加严重，这些变化影响着数十亿依赖降雨维持生计的人们的生活，并且由于热带和热带之间的联系对世界产生了重要影响。预测未来降雨量和温度的变化需要长期记录来测试气候模型和理论，此类记录在热带地区通常很少，特别是在热带西太平洋地区，现有记录在模式和幅度上存在很大差异。过去的气候变化。该项目的目标是开发热带西太平洋（该地区对全球气候过程尤其重要）的温度、降雨量和植被的新记录，并调查其原因。这项研究将使我们能够检验热带和热带地区的理论。该项目将为美国研究生和本科生提供许多进行研究的机会，并将开发用于普罗维登斯公立学校的新的气候变化课堂模块。系统。这项研究将调查降雨、温度、轨道尺度的变化，该项目将通过对印度尼西亚中部苏拉威西岛托乌提湖最近回收的沉积物钻芯进行分析，对印度太平洋暖池（IPWP）过去 110 万年的沉积物和植被进行有机地球化学分析。评估热带季节性日照、高纬度冰量、温度、大气温室气体浓度和海平面的变化对全球气候边界条件关键转变期间 IPWP 气候的影响。 80万年前中更新世期间的全球气候转变，当时冰川-间冰期变率从主要的41-kyr冰期周期过渡到100-kyr冰期周期，以及430,000年，当时100-kyr周期加剧。了解热带气候如何随着与当今不同的气候边界条件而变化。该奖项反映了 NSF 的法定使命，并具有通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

A brGDGT‐Based Reconstruction of Terrestrial Temperature From the Maritime Continent Spanning the Last Glacial Maximum

• DOI: 10.1029/2022pa004501
• 发表时间: 2023-02
• 期刊: Paleoceanography and Paleoclimatology
• 影响因子: 3.5
• 作者: M. Parish;X. Du;S. Bijaksana;J. Russell

Deglacial trends in Indo-Pacific warm pool hydroclimate in an isotope-enabled Earth system model and implications for isotope-based paleoclimate reconstructions

• DOI: 10.1016/j.quascirev.2021.107188
• 发表时间: 2021-09-20
• 期刊: QUATERNARY SCIENCE REVIEWS
• 影响因子: 4
• 作者: Du, Xiaojing;Russell, James M.;He, Chengfei
• 通讯作者: He, Chengfei