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| Probing the potential of STalagmite Organic Matter as a direct tracer for terrestrial ecosystem dynamics and their response to past Climate Change (STOM-CC) | |
| 项目编号 | PZ00P2_186135 |
| Lechleitner Franziska | |
| 项目主持机构 | University of Berne - BE |
| 开始日期 | 2020-09-01 |
| 结束日期 | 2024-08-31 |
| 英文摘要 | Terrestrial ecosystems are an integral component of the global carbon cycle, and significantly impact the global climate system via feedbacks driven by biological and physico-chemical processes. Large uncertainties remain with respect to the magnitude and direction of these feedbacks. This is mainly because of the spatial and compositional heterogeneity of terrestrial ecosystems, which makes their dynamics difficult to assess on a global scale. Here I propose the implementation of a novel multi-proxy approach on stalagmites (secondary cave carbonates) that will provide unprecedented insight into local ecosystem responses (soil, vegetation, microbial communities) to past climate change. This project will pioneer the simultaneous reconstruction of past climatic and local ecosystem changes at high temporal resolution and chronological control, capitalising on the amenability of stalagmites to high precision dating. The novelty of this project is the establishment of stalagmite organic carbon isotope records (d13COC and 14COC) as a routine application for high-resolution reconstructions of past terrestrial ecosystem dynamics. I will apply a previously developed wet oxidation method for extraction and isotopic analysis of stalagmite organic carbon to samples from key climate regions (tropical, monsoonal, mid-latitudes, arid, sub-arctic) and periods (last glacial, deglaciation, Holocene). I will investigate the potential of d13COC and 14COC as palaeo-ecosystem proxies, and deliver high-resolution stalagmite records of coupled organic-inorganic carbon isotopes over crucial periods in Earth’s recent past. Moreover, I will supervise a PhD project focused on a process study of inorganic and organic carbon fluxes in a Swiss cave, which will provide detailed, monthly data over the course of at least one year. This will be the highest resolution and most detailed analysis of karst carbon fluxes available to date, and provide indispensable new data to solve the long-standing scientific debate about the importance and dynamics of different carbon reservoirs in karst environments. With this project, I aim at answering the following questions:•How did the soil-karst carbon cycle respond to past periods of climate change, in particular to warming and drought? Did the organic and inorganic carbon pools in the soil-karst system respond differentially to climate forcing? What types of local ecosystem responses can be reconstructed using stalagmite organic carbon isotopes? (Section 2.3.1.)•What are the sources of OM in stalagmites, and can we single them out using combined organic and inorganic d13C and 14C measurements and characterisation of OM on samples from different carbon reservoirs in karst systems? (Section 2.3.2.)The results from this project are very likely to have high international impact and lead to future research towards the development of quantitative ecosystem proxies from stalagmites, and to provide a much deeper understanding of the impact of climate change on terrestrial ecosystems at local scale. The results will be published in peer-reviewed, open access international journals, in parallel with data release on open access data sharing platforms. As PI of the project, I will be able to gain academic independence and leadership skills, which will greatly aid my future search for faculty-level positions. |
| 英文关键词 | organic geochemistry; radiocarbon; stable isotopes; carbon cycle; stalagmite; palaeoclimate; ecosystem; mass spectrometry; isotope analysis |
| 学科分类 | 0803 - 地球化学;08 - 地球科学 |
| 资助机构 | CH-SNSF |
| 项目经费 | 950541 |
| 项目类型 | Ambizione |
| 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/191031 |
| 推荐引用方式 GB/T 7714 | Lechleitner Franziska.Probing the potential of STalagmite Organic Matter as a direct tracer for terrestrial ecosystem dynamics and their response to past Climate Change (STOM-CC).2020. |
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