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浮游物从硅（硅藻）中弹出壳，负责将大部分碳从地面海洋运输到深海。因此，硅藻的生产力的变化控制了二氧化碳在大气中的含量以及在深海中传达和存储多少。该提案的目的是研究硅藻在使用硅藻生产力的特征和新颖的签名（即D30SI）中驱动气候变化在长时间尺寸上的作用。我们的目的是找出硅藻生产力的重大变化是否会增强二氧化碳从大气层到深海的吸引，在最后一个〜50的MYR中，可能会导致地球从没有或没有小冰的温室世界过渡到现代冰屋，并使用当前的双极冰球。此外，我们旨在基于一些初步证据，表明硅藻在全球变暖中蓬勃发展，并确定硅藻生产力是否可以作为对二氧化碳碳化物排放的负面反馈。随着冰川在南极洲和融水通量周围撤退到这个高生产力的沿海地区，可能会增加营养素的输入，并增强水柱的稳定性，每柱都可以提高硅藻生产率。在过去的500年中，我们将在迅速积累的南极半岛沉积物中构建硅藻生产力的记录。通过针对过去的500年，我们的分析将捕获全新世的冰河时代（1850年结束）的最后一次冰川进步和恢复，并让我们能够测试硅藻是否会随着冰川的静修而始终如一地提高生产力，并评估对人类学上强制性冰川静修的硅藻反应是否在此时间上是未预见的。

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