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(ESH) Reconstructing Surface Ocean Productivity and Bottom Water Oxygen Content for the Eastern Pacific Over the Past Several 100,000 Years

(ESH) 重建过去数十万年东太平洋表层海洋生产力和底层水氧含量

基本信息

批准号：
9503669
负责人：
Paul Loubere
金额：
$ 5.26万
依托单位：
Northern Illinois University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1995
资助国家：
美国
起止时间：
1995-08-15 至 1997-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9503669&HistoricalAwards=false
关键词：
ESH Reconstructing Surface Ocean Productivity

项目摘要

9503669 Loubere Detailed quantitative analysis of surface ocean productivity and bottom water oxygen contend over the past 400,000 years is proposed using two cores from the eastern equatorial Pacific. Paleoproductivity estimates will be based on a new quantitative, benthic Foraminiferal transfer function constrained by qualitative proxies extracted from statistical analysis of combined planktonic and benthic Foraminiferal assemblages, accumulation rates of sedimentary components and accumulation rates of benthic Foraminifera. The deep water paleo-oxygen estimates will be based on a quantitative benthic Foraminiferal transfer function tested at this stage by seeking a coherent signal at coring locations positioned under different biological productivity regimes. The main objective of the paleoproductivity work will be generate quantitative estimates over a time period long enough to test the relationship of eastern equatorial Pacific productivity to global climate change. Also, the data can be used to examine a model of equatorial paleoproductivity in which changes along the equator are antithetical to those in the 5 to 10 degree latitude belts on either side of the equator. Finally, the data, combined with accumulation rates of terrigenous components, can be used to examine the 'iron hypothesis' for productivity enhancement. The main objective of the paleo-oxygen work will be to test for signal coherence at different coring locations and to test initial results showing paleo-oxygen minima corresponding to North Atlantic melt water pulses and to Heinrich events.

9503669 Loubere利用赤道东太平洋的两个岩心，对过去40万年的表层海洋生产力和底水氧争进行了详细的定量分析。古生产力估计将基于一个新的定量底栖有孔虫传递函数，该函数由浮游生物和底栖有孔虫组合的统计分析、沉积成分的积累速率和底栖有孔虫的积累速率提取的定性指标约束。深水古氧估计将基于定量底栖有孔虫传递函数，在此阶段通过在不同生物生产力制度下定位的岩心位置寻找相干信号进行测试。古生产力工作的主要目标是在足够长的时间内产生定量估计，以测试赤道东太平洋生产力与全球气候变化的关系。此外，这些数据还可用于检验赤道古生产力模型，其中沿赤道的变化与赤道两侧5至10度纬度带的变化是相反的。最后，这些数据，结合陆源成分的积累速率，可以用来检验“铁假设”的生产力提高。古氧工作的主要目的是测试不同岩心位置的信号相干性，并测试显示与北大西洋融水脉冲和海因里希事件相对应的古氧极小值的初步结果。