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

该合作项目的目的是利用婆罗洲洞穴中的高增长率、准确年代的洞穴洞穴，重建厄尔尼诺南方涛动(ENSO)的长期和短期变化。利用洞穴化石，研究人员将产生全新世五个关键时期的三角洲18氧变化的150到300年的时间序列。研究涉及以下几个科学问题：1)全新世早期厄尔尼诺现象是不存在还是只是减弱？2)晚全新世厄尔尼诺事件的频率或幅度是否在百年时间尺度上发生变化？3)赤道西太平洋降水的低频变化是由ENSO还是热带间辐合带(ITCZ)的迁移驱动的？4)ENSO对热带雨林生产力的影响能否通过恒温稳定同位素记录来检测？更广泛的影响包括培训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.