Collaborative Research: P2C2--Western Equatorial Pacific Rainfall during the Holocene - New Interannual Records from High Resolution Borneo Stalagmites

合作研究：P2C2——全新世西赤道太平洋降雨——高分辨率婆罗洲石笋的新年际记录

• 批准号: 1406713
• 负责人: Sharon Hoffmann
• 金额: $ 2.23万
• 依托单位: University of North Carolina at Wilmington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-10-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1406713&HistoricalAwards=false
• 关键词: Collaborative; Research; P2C2; Western; Equatorial

The aim of this collaborative project is to reconstruct long-term and short-term changes in the El Nino Southern Oscillation (ENSO) using high-growth rate, precisely dated speleothems from caves in Borneo. Using the speleothems, the researchers would produce 150- to 300-year time series of changes in delta 18-Oxygen for five key time periods during the Holocene. The research addresses several science questions, such as: 1) Was ENSO absent or just weaker in the early Holocene? 2) Did the frequency or magnitude of El Nino events change on centennial time scales during the late Holocene? 3) Were low-frequency changes in western equatorial Pacific precipitation driven by ENSO or by migration of the Inter-Tropical Convergence Zone (ITCZ)? and 4) Can the impact of ENSO on tropical rain forest productivity be detected using speleotherm stable isotopic records?The broader impacts include the training off a female postdoctoral researcher and the mentoring of undergraduates involved with the research project. Data would be archived at the National Climatic Data Center.

该合作项目的目的是利用婆罗洲洞穴中的高增长率、精确年代测定的洞穴沉积物重建厄尔尼诺南方涛动（ENSO）的长期和短期变化。利用洞穴沉积物，研究人员将在全新世的五个关键时期产生150至300年的三角洲18-氧变化时间序列。这项研究解决了几个科学问题，例如：1）ENSO在全新世早期是不存在还是只是较弱？2)在全新世晚期，厄尔尼诺事件的频率或强度在百年时间尺度上发生了变化吗？3)赤道西太平洋降水的低频变化是由ENSO还是由热带辐合带（ITCZ）的迁移驱动的？（4）能否利用洞穴热稳定同位素记录检测ENSO对热带雨林生产力的影响？更广泛的影响包括培训一名女博士后研究员和指导参与研究项目的本科生。 数据将在国家气候数据中心存档。