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

这个合作项目的目的是利用在婆罗洲洞穴中发现的高增长率、精确确定年代的洞穴化石，重建厄尔尼诺-南方涛动（ENSO）的长期和短期变化。利用洞穴主题，研究人员将得出全新世五个关键时期三角洲18-氧150至300年的时间序列变化。该研究解决了几个科学问题，例如：1)全新世早期ENSO是缺失还是较弱？2)在全新世晚期，厄尔尼诺事件的频率或强度是否在百年时间尺度上发生了变化？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) ENSO对热带雨林生产力的影响能否利用洞穴热稳定同位素记录来检测？更广泛的影响包括培养一名女性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。

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.