Collaborative Research: Reconstructing Holocene Climate Variability and the Indonesian throughflow in the Western Equatorial Pacific

合作研究：重建全新世气候变率和西赤道太平洋的印度尼西亚通流

• 批准号: 0502504
• 负责人: Yair Rosenthal
• 金额: --
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-01 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0502504&HistoricalAwards=false
• 关键词: Collaborative; Research; Reconstructing; Holocene; Climate

Abstract: Under this award the proponents will determine the role of the Indonesian Throughflow (ITF) in Earth's climate through its effect on the heat and freshwater budgets and the air-sea heat fluxes of the Pacific and Indian Oceans. Estimates of salinity and temperature will be generated using d18O and Mg/Ca in benthic and planktonic foraminifera from the best sediment cores along depth transects between 300-700m water depth in the Makassar Strait. High accumulation rates will allow reconstruction centennial to millennial variability over the last ~14,000 years. Specific questions which will addressed: Are key elements of past climate variability in the western equatorial Pacific consistent with the hypothesis that variations in the amplitude and frequency of ENSO force changes in ITF on centennial to millennial time scales during the Holocene? Is the timing and amplitude of Holocene abrupt changes in ITF consistent with a link to broader tropical-scale climate change? Is there a link to extra-tropical changes? Was there a long-term change in ITF strength throughout the Holocene? How does that change compared with the ITF variability during the deglaciation? Did the apparent shift to more El Nino-like conditions in the late Holocene or the freshening of the western Pacific warm pool influence the ITF? Does the freshening trend reflect a regional response to southward migration of the ITCZ or an expansion of local, monsoon-derived freshwater inputs? The proposals broader impacts include several graduate and undergraduate students who will receive training related to this project and utilize data generated in this project as part of their undergraduate or graduate thesis.

摘要：根据该奖项，支持者将通过印度尼西亚穿流（ITF）对太平洋和印度洋的热量和淡水收支以及海气热通量的影响来确定其在地球气候中的作用。 将使用望加锡海峡 300-700 m 水深之间深度横断面的最佳沉积岩芯中底栖和浮游有孔虫中的 d18O 和 Mg/Ca 来估算盐度和温度。 高积累率将使重建在过去约 14,000 年中出现百年到千年的变化。 将解决的具体问题：过去西赤道太平洋气候变化的关键要素是否与全新世期间 ENSO 的幅度和频率变化迫使 ITF 在百年到千年时间尺度上发生变化的假设一致？ ITF 全新世突变的时间和幅度是否与更广泛的热带气候变化有关？与热带外的变化有联系吗？ 在整个全新世期间，ITF 实力是否发生了长期变化？与冰消期期间的 ITF 变化相比，这种变化有何变化？ 全新世晚期明显转向更像厄尔尼诺现象的情况或西太平洋暖池的清新是否影响了 ITF？ 淡水化趋势是否反映了对 ITCZ 南移的区域反应或当地季风淡水输入的扩大？这些提案具有更广泛的影响，包括几名研究生和本科生，他们将接受与该项目相关的培训，并利用该项目生成的数据作为本科生或研究生论文的一部分。