Collaborative Research: Holocene/Deglacial Abrupt Climate Change and Variability of the Western Pacific Warm Pool from Multi-decadal to Century-scale Coral Climate Records

合作研究：全新世/冰消期气候突变和西太平洋暖池从数十年到世纪尺度珊瑚气候记录的变化

• 批准号: 0402249
• 负责人: Richard Edwards
• 金额: $ 7.83万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-05-15 至 2007-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0402249&HistoricalAwards=false
• 关键词: Collaborative; Research; Holocene; Deglacial; Abrupt

Under this award the PIs will use fossil corals from the western Solomon Islands and eastern Papua New Guinea to reconstruct high-resolution Holocene/ Deglacial paleoclimate records. The study area is located near the heart of the Western Pacific Warm Pool (WPWP), a region that serves as the heat engine of the planetary climate system and a primary source of water vapor to the atmosphere. Studies of the instrumental record show that variations in the thermal and hydrologic properties of the WPWP have global ocean and atmospheric ramifications. This project would generate monthly resolved, multidecadal to century-scale proxy records of thermal and hydrologic variability in the WPWP via paired isotopic (?18O) and elemental ratio (Sr/Ca, Mg/Ca, U/Ca) determinations in fossil corals. These geochemical determinations will be made after the fossil coral samples have been evaluated for potential diagenetic alteration using petrography and mineralogy criteria and after they have been precisely dated by TIMS U-series analysis. The coral proxy climate records will be used to 1) identify and define the timing and magnitude of abrupt transitions and extremes in Holocene/Deglacial climate in the WPWP and determine how abrupt changes in the tropics are related to previously defined intervals of abrupt change in the extra-tropics; and 2) determine how changes in the mean climate state of the WPWP tropical region influence the nature of tropical climate variability on interannual to centennial timescales during the Holocene.

根据这项奖励，私人投资机构将利用所罗门群岛西部和巴布亚新几内亚东部的化石珊瑚重建高分辨率的全新世/去冰期古气候记录。研究区域位于西太平洋暖池(WPWP)的中心附近，该地区是行星气候系统的热机，也是大气中水汽的主要来源。对仪器记录的研究表明，WPWP的热和水文性质的变化对全球海洋和大气都有影响。该项目将通过对化石珊瑚中的同位素(18O)和元素比率(锶/钙、镁/钙、铀/钙)的测定，产生每月可分辨的、数十年至世纪尺度的WPWP热力和水文变异性的替代记录。这些地球化学测定将在利用岩相学和矿物学标准对化石珊瑚样品进行潜在成岩蚀变评价后，并在通过TIMS U系列分析确定其准确年代后进行。珊瑚替代气候记录将用于1)确定和确定WPWP全新世/去冰期气候突变和极端的时间和幅度，并确定热带突变与先前确定的热带外气候突变间隔之间的关系；2)确定WPWP热带区域平均气候状态的变化如何影响全新世期间年际至百年时间尺度上热带气候变异性的性质。