期刊
GLOBAL BIOGEOCHEMICAL CYCLES
卷 34, 期 12, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GB006486
关键词
silicon cycle; benthic flux; sediment cycling; continental shelf
资金
- UK Natural Environment Research Council (NERC) through the Collaborative Antarctic Science Scheme
- Royal Society [RGF\EA\180068]
- UK NERC [NE/K010034/1]
- NERC through ORCHESTRA [NE/N018095/1]
- UKRI NERC through the Changing Arctic Ocean Programme [NE/P006493/1]
- NERC [NE/K010034/1, NE/N018095/1, NE/P006493/1] Funding Source: UKRI
In this study we evaluate the benthic fluxes of silicic acid along the West Antarctic Peninsula (WAP). Silicic acid (DSi) is one of the macronutrients essential in fuelling biological hot spots of diatom-dominated primary production along the WAP. Here we measure the concentration and stable silicon isotopic composition of DSi in porewater profiles, biogenic silica content (BSi), and diatom abundance from sediment cores collected along the WAP. We couple these measurements with reaction-transport modeling, to assess the DSi flux and the processes that release this key nutrient from the sediment into the overlying waters. Our results show that the benthic DSi flux is dominated by the diffusive flux, which is estimated to be equivalent to 26.7 +/- 2.7 Gmol yr(-1) for the WAP continental shelf. The DSi isotope profiles reveal the important impact of sedimentary processes on porewater DSi and suggest that biogenic silica dissolution is the main source of DSi in porewaters and consequently of the benthic fluxes. Our integrated data-model assessment highlights the impact of surface productivity on sedimentary processes and the dynamic environment of core-top sediments where dissolution and reverse weathering reactions control DSi exchanges.
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