Origin of sedimentary organic matter in the north-western Adriatic Sea
| Autor: | Giani M. (1, Berto D. (3), Rampazzo F. (3), Savelli F. (3), Alvisi F. (2), Giordano P. (2), Ravaioli M. (2), Frascari F. (2) |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Total organic carbon Biogeochemical cycle Adriatic Sea organic carbon fungi Po River Sediment Aquatic Science Plankton Oceanography Deposition (geology) carbon stable isotopes chemistry shelf-sediments Phytoplankton Environmental science Sedimentary organic matter Organic matter |
| Zdroj: | Estuarine, coastal and shelf science 84 (2009): 573–583. doi:10.1016/j.ecss.2009.07.031 info:cnr-pdr/source/autori:Giani M. (1,3), Berto D. (3), Rampazzo F. (3), Savelli F. (3), Alvisi F. (2), Giordano P. (2), Ravaioli M. (2), Frascari F. (2)/titolo:Origin of sedimentary organic matter in the north-western Adriatic Sea/doi:10.1016%2Fj.ecss.2009.07.031/rivista:Estuarine, coastal and shelf science (Print)/anno:2009/pagina_da:573/pagina_a:583/intervallo_pagine:573–583/volume:84 |
| DOI: | 10.1016/j.ecss.2009.07.031 |
| Popis: | In order to evaluate the origin and the transformation of organic matter on the shallow shelf of the NW Adriatic Sea, organic carbon, total nitrogen and stable isotope ratios of organic carbon were analysed in riverine suspended matter and sediments as well as in marine suspended and sedimentary organic matter, in marine phytoplankton and zooplankton. The deposition of organic matter is influenced by fine sediment concentration. Surface sediments were characterised by highly variable biogeochemical conditions on the sea floor, whereas sub-surface sediments showed a more homogeneous hypoxic/anoxic environment. Low C org /N ratio and high organic carbon and nitrogen concentrations in riverine suspended organic matter indicate an important contribution of freshwater phytoplankton within rivers, particularly during low flow regimes, which adds to the marine phyto- and zooplankton at shelf locations. In order to evaluate the importance of terrestrial, riverine and marine sources of OM in shelf sediments, a three end-member mixing model was applied to shelf surface sediments using 13 C/ 12 C values for organic matter and N/C ratios. The model showed an elevated contribution of terrestrial organic substances at intermediate depths (10–15 m), mostly corresponding to an area of coarser grain-size, whereas the riverine and marine organic fractions were mainly accumulating near the coast and offshore, respectively. |
| Databáze: | OpenAIRE |
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