The impact of ocean acidification on marine dissolved organic matter
In this thesis, I investigated the impact of ocean acidification on marine dissolved organic matter (DOM), one of the largest active carbon pools on earth and an important factor in the global carbon cycle. The first part evaluates the influence of elevated pCO2 levels on DOM based on experimental r...
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| Format: | Thesis |
| Language: | unknown |
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2016
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| Online Access: | http://oops.uni-oldenburg.de/2702/ http://oops.uni-oldenburg.de/2702/1/zarimp16.pdf |
| Summary: | In this thesis, I investigated the impact of ocean acidification on marine dissolved organic matter (DOM), one of the largest active carbon pools on earth and an important factor in the global carbon cycle. The first part evaluates the influence of elevated pCO2 levels on DOM based on experimental results from large-scale pelagic mesocosm experiments that allow for simulating future ocean conditions. The production and consumption of individual molecular compounds was monitored via ultrahigh-resolution Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). Whereas a clear succession could be observed for individual molecules being produced or consumed over time, no differences were detected in molecular DOM composition related to CO2 concentrations. The second part focuses on the diversity of DOM in terms of its chemical structure and fragmentation experiments using FT-ICR-MS indicated the presence of a large pool of compounds with common structural features in DOM among aquatic environments. Further evidence was observed for the fact that a high number of isomers exist for each molecular formula detected in DOM. |
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