Comparing benthic biogeochemistry at a sandy and a muddy site in the Celtic Sea using a model and observations
| العنوان: | Comparing benthic biogeochemistry at a sandy and a muddy site in the Celtic Sea using a model and observations |
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| المؤلفون: | J. van der Molen, E.M.S. Woodward, B. Silburn, J. K. Klar, Gennadi Lessin, Jeroen Ingels, Silke Kröger, D. Sivyer, J. N. Aldridge, Vassilis Kitidis, Steve Widdicombe, Laurent O. Amoudry, Tiago H. Silva, Natalie Hicks, E. R. Parker, Luz Garcia, Helen E. K. Smith, C. L. McNeill, Tom Hull |
| المصدر: | Biogeochemistry |
| بيانات النشر: | Springer International Publishing, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | 0106 biological sciences, 010504 meteorology & atmospheric sciences, Celtic Sea, 01 natural sciences, Article, Modelling, Carbon cycle, Pore water pressure, Benthos, Environmental Chemistry, Organic matter, 14. Life underwater, Benthic, 0105 earth and related environmental sciences, Earth-Surface Processes, Water Science and Technology, Total organic carbon, chemistry.chemical_classification, 010604 marine biology & hydrobiology, Biogeochemistry, Sediment, Permeable sediments, Oceanography, chemistry, 13. Climate action, Benthic zone, Environmental science |
| الوصف: | Results from a 1D setup of the European Regional Seas Ecosystem Model (ERSEM) biogeochemical model were compared with new observations collected under the UK Shelf Seas Biogeochemistry (SSB) programme to assess model performance and clarify elements of shelf-sea benthic biogeochemistry and carbon cycling. Observations from two contrasting sites (muddy and sandy) in the Celtic Sea in otherwise comparable hydrographic conditions were considered, with the focus on the benthic system. A standard model parameterisation with site-specific light and nutrient adjustments was used, along with modifications to the within-seabed diffusivity to accommodate the modelling of permeable (sandy) sediments. Differences between modelled and observed quantities of organic carbon in the bed were interpreted to suggest that a large part (>90%) of the observed benthic organic carbon is biologically relatively inactive. Evidence on the rate at which this inactive fraction is produced will constitute important information to quantify offshore carbon sequestration. Total oxygen uptake and oxic layer depths were within the range of the measured values. Modelled depth average pore water concentrations of ammonium, phosphate and silicate were typically 5–20% of observed values at the muddy site due to an underestimate of concentrations associated with the deeper sediment layers. Model agreement for these nutrients was better at the sandy site, which had lower pore water concentrations, especially deeper in the sediment. Comparison of pore water nitrate with observations had added uncertainty, as the results from process studies at the sites indicated the dominance of the anammox pathway for nitrogen removal; a pathway that is not included in the model. Macrofaunal biomasses were overestimated, although a model run with increased macrofaunal background mortality rates decreased macrofaunal biomass and improved agreement with observations. The decrease in macrofaunal biomass was compensated by an increase in meiofaunal biomass such that total oxygen demand remained within the observed range. The permeable sediment modification reproduced some of the observed behaviour of oxygen penetration depth at the sandy site. It is suggested that future development in ERSEM benthic modelling should focus on: (1) mixing and degradation rates of benthic organic matter, (2) validation of benthic faunal biomass against large scale spatial datasets, (3) incorporation of anammox in the benthic nitrogen cycle, and (4) further developments to represent permeable sediment processes. Electronic supplementary material The online version of this article (doi:10.1007/s10533-017-0367-0) contains supplementary material, which is available to authorized users. |
| وصف الملف: | text |
| اللغة: | English |
| تدمد: | 1573-515X 0168-2563 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5618f938f739791440437f5e7d771460 http://europepmc.org/articles/PMC6961523 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....5618f938f739791440437f5e7d771460 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 1573515X 01682563 |
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