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，支持者将通过对高温和淡水预算以及太平洋和印度洋的空气热通量的影响来确定印尼遍布（ITF）在地球气候中的作用。 使用D18O和Mg/Ca在麦内氏岩的最佳底座和浮游有孔虫中，将对盐度和温度进行估计，沿深度区域的最佳沉积物核心在Makassar海峡的300-700m水深之间产生。 高积累率将使过去约14，000年的重建百年纪念重建到千禧一代。 将要解决的具体问题：西方赤道太平洋过去气候变化的关键要素是否与假设的假设是，在全新世期间，百年纪念中ITF振幅和ENSO力量变化的幅度和频率变化？ 全新世突然变化ITF的时机和幅度是否与更广泛的热带气候变化链接一致？是否有与热带变化的链接？ 在整个全新世，ITF强度是否存在长期变化？与脱胶过程中的ITF变异性相比，这种变化如何？ 在全新世晚期或西太平洋暖游泳池的新世中，明显转向了更像El Nino样条件吗？ 清新趋势是否反映了对ITCZ向南迁移的区域反应或季风衍生的淡水输入的扩展？这些建议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有关的培训，并利用该项目中生成的数据作为其本科或研究生论文的一部分。