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美国罗格斯大学周晓理博士学术报告
来源:    编辑:王德珲    时间:2018-12-03    
 

地球系统科学论坛第636期:美国罗格斯大学周晓理博士学术报告

应地球科学学院章军锋教授和地球生物学系邀请,美国罗格斯大学周晓理博士来我校交流访问,并做学术报告。

 

报 告 人:周晓理 博士

报告题目:Novel proxy view on Cenozoic ocean chemistry and continental weathering

报告时间:201812月5日(星期三)下午14:00

报告地点:学海斋(主楼412

 

报告简介Cenozoic climate has transitioned from a warmhouse to an icehouse, manifest as decreasing seawater temperature and atmospheric pCO2. What caused the changes in temperature and pCO2, however, has not been fully resolved. Since ocean chemistry is tightly coupled with global carbon cycle on multi-million-year timescale, studies on ocean chemistry can provide potentials to understand long-term changes in carbonate system including pCO2. Major ion concentrations such as Mg and Ca concentrations in seawater ([Mg]sw and [Ca]sw) presumably have changed over the Cenozoic, but existing proxies yielded inconsistent [Mg]sw and [Ca]sw records. To resolve this problem, here I propose to use Na/Ca in foraminifera as a proxy for [Ca]sw. This proxy is testified by culture experiments and core-top samples. The downcore Na/Ca records of three species of foraminifera are generated from multiple locations in the Atlantic and Pacific Ocean. A generally increasing trend in the Na/Ca records suggests a monotonic decrease in [Ca]sw and increase in (Mg/Ca)sw since Eocene. Such a long-term change in [Ca]sw and (Mg/Ca)sw may be a result of coupled changes in continental weathering and hydrothermal flux. High [Ca]sw suggests low carbonate ion concentration ([CO32-]) in the early Cenozoic, which may help explain the high pCO2 at that time.

 

报告人简介:周晓理博士,2011 年本科毕业于中国科学技术大学地球化学专业。之后就读于美国雪城大学(Syracuse University),2016年获博士学位。师从陆尊礼教授,用碳酸钙中的碘钙比研究古海洋中氧气含量的变化,其研究结果以第一作者发表在 Paleoceanography and Paleoclimate,Chemical Geology 等期刊上。目前为罗格斯大学(Rutgers University)博士后,用有孔虫壳体中的钠钙比研究新生代海洋主量元素的浓度变化,以及它与同时期全球气候变化和大陆风化速率之间的关系。曾作为无机地球化学家参与国际大洋钻探计划西南太平洋航次(IODP 371),并将于2019 年参与东南太平洋航次(IODP 379T)。



地球科学学院

BGEG国家重点实验室

2018年12月3日