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.

该项目的目标是在过去的150,000年中，在西部太平洋地区检查尘埃沉积的变化，从最近从线岛山脊中恢复过的一组海洋沉积物核心，并构成了整个现代的热带融合区（ITCZ）的大约160°兴趣的一段互动，从而使整个互动的互动构成了一个互动，从而使整个项目的互动融为一体。在过去的百万年内冰期。遵循该峰间冰期，全球气候通过多个20,000年的周期变化，同时在最后一次退化和全新世间冰河之前，在最后一次冰川最大值（LGM）返回完整的冰川条件。风尘粉尘扮演着重要的角色，影响和记录气候。在大气中，灰尘有助于行星反照率，并用作云凝结核里。在海洋中，粉尘可以通过添加关键的微量营养物质来赋予生物生产力，并为颗粒下沉提供压载物，从而增强从地表海洋中的碳出口并吸收大气中的二氧化碳。在深海沉积物中，尘埃沉积的数量，位置和类型为重建其过去的来源，路径，大小和去除过程提供了簇。这些去除过程包括遵循热带海洋热赤道的ITCZ的变化雨带。该项目将提高人们对气候，灰尘，生产力和氢循环的自然变化的了解，并将促进几位早期职业科学家以及本科生的早期职业科学家的培训和学习。研究团队还将通过Lamont-Doherty Earth观测站的Earth2Class计划与中学和高中科学教师合作，利用他们的研究和教育工作。