P2C2: Collaborative Research: Dust Deposition, Paleo-Export Production, and Migration of the (ITCZ) Through the Last Glacial Cycle in the West-Central Pacific (Line Islands)

P2C2：合作研究：中西部太平洋（莱恩群岛）末次冰河周期期间的灰尘沉积、古出口生产和（ITCZ）迁移

• 批准号: 1502889
• 负责人: Jerry McManus
• 金额: $ 44.14万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-05-15 至 2019-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1502889&HistoricalAwards=false
• 关键词: P2C2; Collaborative; Research; Dust; Deposition

This project's goal is to examine variations in dust deposition throughout the last 150,000 years in the west-central Pacific from a suite of ocean sediment cores recently recovered from the Line Islands Ridge and constituting a roughly north-south transect across the modern Inter-Tropical Convergence Zone (ITCZ) near 160°W longitude.During the interval of interest for the project, the Earth's climate shifted from full glaciation to one of the warmest interglacials in the last million years. Following that peak interglacial, global climate varied through multiple 20,000 year cycles while trending toward a return to full glacial conditions at the last glacial maximum (LGM) before the last deglaciation and Holocene interglacial. Windblown dust plays important roles in influencing and recording climate. In the atmosphere, dust contributes to the planetary albedo and serves as cloud condensation nuclei. In the ocean, dust may fertilize biological productivity through the addition of crucial trace nutrients, and provide ballast for the sinking of particles, thus enhancing carbon export from the surface ocean and drawing down atmospheric carbon dioxide. In deep-sea sediments, the amount, location and type of dust deposition provide clues for reconstructing its past sources, pathways, magnitude and removal processes. These removal processes include the shifting rain belts of the ITCZ that follows the thermal equator over the tropical ocean.The project will advance understanding of natural variations in climate, dust, productivity, and the hydrological cycle, and will promote training and learning for several early career scientists as well as undergraduate students. The research team will also leverage their research and education efforts in collaboration with middle school and high school science teachers through the Lamont-Doherty Earth Observatory's Earth2Class program.

该项目的目标是通过最近从莱恩群岛山脊回收的一套海洋沉积岩芯来研究过去 15 万年中西太平洋尘埃沉积的变化，这些沉积岩芯构成了横跨现代热带辐合带的大致南北横断面西经 160° 附近的区域 (ITCZ)。在该项目感兴趣的时间段内，地球气候从完全冰川期转变为最温暖期之一在最后一百万年的间冰期之后，全球气候经历了多个 20,000 年的周期，同时在末次冰消期之前的末次盛冰期（LGM）趋于恢复到完全冰期状态，而全新世间冰期尘埃发挥着重要作用。在影响和记录气候方面，灰尘有助于行星反照率并充当云凝结核。在海洋中，灰尘可以通过添加重要的微量营养物质，并为颗粒下沉提供压舱物，从而增强海洋表层的碳输出并减少深海沉积物中的大气二氧化碳，灰尘沉积的数量、位置和类型为重建其沉积提供了线索。过去的来源、路径、强度和清除过程。这些清除过程包括沿着热带海洋热赤道移动的 ITCZ 雨带。该项目将增进对气候、灰尘、生产力和水文循环，并将促进培训研究团队还将通过拉蒙特-多尔蒂地球观测站的 Earth2Class 项目，与中学和高中科学教师合作，为几位早期职业科学家和本科生提供学习和学习机会。