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A d30Si isotopic view on the climatic role of diatoms: driver or feedback?

关于硅藻气候作用的 d30Si 同位素观点：驱动因素还是反馈？

基本信息

批准号：
NE/F005296/1
负责人：
Rosalind Emily Mayors Rickaby
金额：
$ 53.3万
依托单位：
University of Oxford
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2008
资助国家：
英国
起止时间：
2008 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FF005296%2F1
关键词：
d30Si isotopic view climatic role

项目摘要

Large blooms of single celled phytoplankton which make their shells out of silica, the diatoms, are responsible for transporting the majority of carbon from the surface ocean to the deep ocean. Changes in the productivity of diatoms therefore control how much carbon dioxide resides in the atmosphere and how much is conveyed and stored in the deep ocean. The aim of this proposal is to investigate the role of diatoms in driving changing climate on long and short timescales using a characteristic and novel signature of diatom productivity, namely the d30Si. Our intention is to find out whether major changes in diatom productivity which would have enhanced the draw-down of carbon dioxide from the atmosphere to the deep ocean, during the last ~ 50 Myrs could have contributed to Earth's transition from a greenhouse world with no or little ice, to the modern ice house world with the current bipolar ice sheets. Further, we aim to build on some preliminary evidence that diatoms are flourishing with global warming and find out whether diatom productivity could act as a negative feedback on anthropogenic emissions of carbon dioxide. As glaciers retreat around Antarctica and the meltwater flux increases into this highly productive coastal zone, there is the potential for increased input of nutrients and also enhanced stability of the water column, each of which can lead to enhanced diatom productivity. We shall construct a record of diatom productivity, again using d30Si, over the last 500 years in rapidly accumulating sediments of the Antarctic Peninsula. By targeting the last 500 years, our analyses will capture the last glacial advance and recovery from the Little Ice Age period (ending 1850) of the Holocene and allow us to test whether diatoms consistently increase productivity as glaciers retreat, and assess whether the diatom response to the anthropogenically forced glacial retreat is unprecedented on this timescale.

大量的单细胞浮游植物以硅藻为外壳，负责将大部分碳从表层海洋输送到深海。因此，硅藻生产力的变化控制着大气中的二氧化碳含量以及深海中输送和储存的二氧化碳量。该提案的目的是利用硅藻生产力的特征和新颖特征（即 d30Si）研究硅藻在长期和短期内驱动气候变化的作用。我们的目的是查明在过去约 50 迈尔斯期间，硅藻生产力的重大变化是否会导致地球从没有冰或很少有冰的温室世界转变为拥有当前两极冰盖的现代冰屋世界，硅藻生产力的重大变化会增强二氧化碳从大气到深海的吸收。此外，我们的目标是基于硅藻随着全球变暖而蓬勃发展的一些初步证据，并找出硅藻生产力是否可以对人为二氧化碳排放起到负反馈作用。随着南极洲周围冰川的退缩，融水通量增加进入这个高产的沿海地区，营养物质的输入可能会增加，水柱的稳定性也会增强，这两者都可以提高硅藻的生产力。我们将再次使用 d30Si 来构建过去 500 年来南极半岛快速积累的沉积物中硅藻生产力的记录。通过以过去 500 年为目标，我们的分析将捕捉到全新世小冰河时期（1850 年结束）以来最后一次冰川的推进和恢复，使我们能够测试随着冰川退缩，硅藻是否持续提高生产力，并评估硅藻对人为强迫冰川退缩的反应在这一时间尺度上是否是前所未有的。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Silicon isotopes in Antarctic sponges: an interlaboratory comparison

DOI：
10.1017/s0954102010000593
发表时间：
2011-02-01
期刊：
ANTARCTIC SCIENCE
影响因子：
1.6
作者：
Hendry, Katharine R.;Leng, Melanie J.;Halliday, Alex N.
通讯作者：
Halliday, Alex N.

Diatom silicon isotopes as a proxy for silicic acid utilisation: a southern ocean core top calibration

DOI：
10.1016/j.gca.2012.08.002
发表时间：
2012-11
期刊：
Geochimica et Cosmochimica Acta
影响因子：
5
作者：
K. Egan;R. Rickaby;M. Leng;K. Hendry;M. Hermoso;H. Sloane;H. Bostock;A. Halliday
通讯作者：
K. Egan;R. Rickaby;M. Leng;K. Hendry;M. Hermoso;H. Sloane;H. Bostock;A. Halliday

Deep ocean nutrients during the Last Glacial Maximum deduced from sponge silicon isotopic compositions