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| Exploring the potential of stalagmite organic carbon isotope records as a novel proxy for past ecosystem conditions | |
| 项目编号 | P4P4P2_186693 |
| Lechleitner Franziska | |
| 项目主持机构 | University of Berne - BE |
| 开始日期 | 2020-03-01 |
| 结束日期 | 2020-08-31 |
| 中文摘要 | Terrestrial ecosystems are an important component of the global carbon cycle, and they have the potential to significantly acerbate as well as to mitigate anthropogenic climate change. Because of their spatial and compositional heterogeneity, and the highly non-linear responses expected with increasing global temperatures, their response to climate change remains highly uncertain. Improving our understanding of terrestrial ecosystem responses, both at the local and global scale, is therefore a pressing issue. Here I propose the use of stalagmites (secondary cave carbonates) as a novel archive for high-resolution, precisely dated reconstructions of past local ecosystem dynamics. In combination with more established stalagmite proxies for climate reconstruction (e.g., d18O), this has the potential to allow for simultaneous reconstructions of climatic conditions and local ecosystem response over key periods of climate change in the past. To date no stalagmite proxy that offers quantitative information on local ecosystem dynamics exists. With this project, I aim at closing this research gap by assessing the potential of carbon isotopes (d13C and 14C) in stalagmite organic matter (OM) as a novel proxy for specific ecosystem processes, e.g., soil carbon export, and vegetation dynamics. I will refine and validate a previously developed wet oxidation method for the extraction and isotopic characterisation of stalagmite OM, and apply it to samples from key climatic regions (tropical, monsoonal, subarctic). With this project, I will investigate the following research questions:•What is the potential of stalagmite OM isotope records (d13COC and 14COC) as high-fidelity proxies for past ecosystem responses? Can we combine inorganic and organic carbon isotopes to investigate how different carbon pools in the soil-karst system responded to climate change?•Can stalagmites be used to simultaneously assess past climate conditions and the associated local ecosystem responses using a multi-proxy approach? How did the soil-karst carbon cycle respond to past periods of climate change, in particular to warming and drought?The results of this project will likely have high international impact and provide important answers with respect to the past response of terrestrial ecosystems to climatic change. Moreover, the implementation of coupled inorganic-organic carbon isotope records will spur further research towards quantitative reconstructions of local ecosystem dynamics using stalagmites. |
| 英文关键词 | battery storage; policy analysis; consumer preferences; technology diffusion; experimental methods; agent-based modelling; human decision-making; solar photovoltaics |
| 学科分类 | 0803 - 地球化学;08 - 地球科学 |
| 资助机构 | CH-SNSF |
| 项目经费 | 125386 |
| 项目类型 | Careers;Fellowships |
| 国家 | CH |
| 语种 | 英语 |
| 文献类型 | 项目 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/125573 |
| 推荐引用方式 GB/T 7714 | Lechleitner Franziska.Exploring the potential of stalagmite organic carbon isotope records as a novel proxy for past ecosystem conditions.2020. |
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