Organic Matter Sources in North Atlantic Fjord Sediments
| Autor: | Jochen Knies, Johan C. Faust |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Total organic carbon geography VDP::Mathematics and natural science: 400::Geosciences: 450 geography.geographical_feature_category organic carbon fjord Fjord source to sink Geophysics Oceanography chemistry Geochemistry and Petrology VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 carbon accumulation Organic matter Source to sink marine sediments land-ocean interaction Geology |
| Zdroj: | Geochemistry, Geophysics, Geosystems. 20:2872-2885 |
| ISSN: | 1525-2027 |
| DOI: | 10.1029/2019gc008382 |
| Popis: | Source at https://doi.org/10.1029/2019GC008382. ©2019. American Geophysical Union. All Rights Reserved. To better constrain the global carbon cycle fundamental knowledge of the role of carbon cycling on continental margins is crucial. Fjords are particularly important shelf areas for carbon burial due to relatively high sedimentation rates and high organic matter fluxes. As terrigenous organic matter is more resistant to remineralization than marine organic matter, a comprehensive knowledge of the carbon source is critical to better constrain the efficiency of organic carbon burial in fjord sediments. Here we investigated highly productive fjords in northern Norway and compare our results with both existing and new organic carbon to organic nitrogen ratios and carbon stable isotope compositions from fjords in mid‐Norway, west Svalbard, and east Greenland. The marine organic carbon contribution varies significantly between these fjords, and the contribution of marine organic carbon in Norwegian fjords is much larger than previously suggested for fjords in NW Europe and also globally. Additionally, northern Norwegian fjords show very high marine carbon burial rates (73.6 gC · m‐2 · year‐1) suggesting that these fjords are probably very distinct carbon burial hotspots. We argue that the North Atlantic Current inflow sustains these high burial rates and changes in the current strength due to ongoing climate change are likely to have a pronounced effect on carbon burial in North Atlantic fjords. |
| Databáze: | OpenAIRE |
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