Biomediation of submarine sediment gravity flow dynamics
| العنوان: | Biomediation of submarine sediment gravity flow dynamics |
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| المؤلفون: | Melissa J. Craig, Megan L. Baker, Kathryn J. Amos, Jaco H. Baas, Andrew J. Manning, David M. Paterson, Julie A. Hope, Lorna J. Strachan, Scott D. Nodder |
| المساهمون: | NERC, University of St Andrews. School of Biology, University of St Andrews. Scottish Oceans Institute, University of St Andrews. St Andrews Sustainability Institute, University of St Andrews. Coastal Resources Management Group, University of St Andrews. Sediment Ecology Research Group, University of St Andrews. Marine Alliance for Science & Technology Scotland |
| المصدر: | Geology. 48:72-76 |
| بيانات النشر: | Geological Society of America, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Gravity (chemistry), 010504 meteorology & atmospheric sciences, Flow (psychology), Sediment, DAS, Geology, Soil science, Laminar flow, 010502 geochemistry & geophysics, 01 natural sciences, Deep sea, QE Geology, Continental margin, Cohesion (geology), Sediment gravity flow, QE, SDG 14 - Life Below Water, 0105 earth and related environmental sciences |
| الوصف: | The Australian Government Research Training Program Scholarship funded Craig’s Ph.D. candidature. An International Association of Sedimentologists Postgraduate Award Grant funded Craig’s visit to Bangor University (Bangor, UK). The UK Natural Environment Research Council grant NE/1027223/1 (COHBED project) enabled this research to be undertaken using the flume facility built by Rob Evans (Bangor University). Sediment gravity flows are the primary process by which sediment and organic carbon are transported from the continental margin to the deep ocean. Up to 40% of the total marine organic carbon pool is represented by cohesive extracellular polymeric substances (EPS) produced by microorganisms. The effect of these polymers on sediment gravity flows has not been investigated, despite the economic and societal importance of these flows. We present the first EPS concentrations measured in deep-sea sediment, combined with novel laboratory data that offer insights into the modulation of the dynamics of clay-laden, physically cohesive sediment gravity flows by biological cohesion. We show that EPS can profoundly affect the character, evolution, and runout of sediment gravity flows and are as prevalent in deep oceans as in shallow seas. Transitional and laminar plug flows are more susceptible to EPS-induced changes in flow properties than turbulent flows. At relatively low concentrations, EPS markedly decrease the head velocity and runout distance of transitional flows. This biological cohesion is greater, per unit weight, than the physical cohesion of cohesive clay and may exert a stronger control on flow behavior. These results significantly improve our understanding of the effects of an unrealized biological component of sediment gravity flows. The implications are wide ranging and may influence predictive models of sediment gravity flows and advance our understanding about the ways in which these flows transport and bury organic carbon globally. Publisher PDF |
| وصف الملف: | application/pdf |
| تدمد: | 1943-2682 0091-7613 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d6bc3d23c9af1c1d8b4964994a0c3d67 https://doi.org/10.1130/g46837.1 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....d6bc3d23c9af1c1d8b4964994a0c3d67 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19432682 00917613 |
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