Modelling marine DOC degradation time scales
| Autor: | Luca Polimene, Ya-Wei Luo, Hermanni Kaartokallio, Eun Young Kwon, Nianzhi Jiao, Yantao Liang, Nannan Wang, Marion Gehlen, Richard B. Rivkin, M. Angelica Peña |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Multidisciplinary 010504 meteorology & atmospheric sciences 010604 marine biology & hydrobiology Bacterial degradation ta1171 chemistry.chemical_element 01 natural sciences Carbon cycle chemistry Environmental chemistry Dissolved organic carbon Environmental science Degradation (geology) Climate model Extended time Carbon 0105 earth and related environmental sciences |
| Zdroj: | National Science Review. 5:468-474 |
| ISSN: | 2053-714X 2095-5138 |
| Popis: | Marine dissolved organic carbon (DOC) is formed of a large number of highly diverse molecules. Depending on the environmental conditions, a fraction of these molecules may become progressively resistant to bacterial degradation and accumulate in the ocean for extended time scales. This long-lived DOC (the so-called recalcitrant DOC, RDOC) is thought to play an important role in the global carbon cycle by sequestering carbon into the ocean interior and potentially affecting the climate. Despite this, RDOC formation is underrepresented in climate models. Here we propose a model formulation descripting DOC recalcitrance through two state variables: one representing the bulk DOC concentration and the other representing its degradability (k) which varies depending on the balance between the production of “new” DOC (assumed to be easily degradable) and bacterial DOC utilization assumed to leave behind more recalcitrant DOC. We propose this formulation as a means to include RDOC dynamics into climate model simulations. |
| Databáze: | OpenAIRE |
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