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Modelling Nitrite Dynamics and Associated Feedback Processes in the Benguela Oxygen Minimum Zone

Continental Shelf Research(2016)SCI 3区

Univ Cape Town | IFREMER | CNRS LEGOS

Cited 6|Views12
Abstract
Understanding nitrite dynamics in oxygen minimum zones (OMZs) is a challenge as it represents an intermediary nitrogen species with a short turnover time. Nitrite is also reduced to nitrogen in OMZs, preventing its accumulation. This creates difficulties in detecting nitrite with colorimetric methods as concentrations may occur below detection limits in some regions. Nitrite concentrations are key to understanding intermediate nitrogen processes and their implication for nitrogen loss in OMZs. A coupled physical-biogeochemical model is applied in the Benguela OMZ to study nitrite dynamics and its associated feedback processes. Simulated results show occurrence of primary and secondary nitrite maxima in the Benguela shelf waters. The primary nitrite maxima in the Benguela are attributed to nitrification and nitrate assimilation as they occur in association with the nitracline. Secondary nitrite maxima accumulate in the Angola-Benguela Front (ABF) OMZ and are attributed to denitrification. The secondary nitrite maxima are consumed by anaerobic ammonium oxidation (anammox) off Walvis Bay. Nitrite maxima are restricted to the shelf off Walvis Bay and advected offshore in the ABF region. Interchanges between the poleward South Atlantic Central Water (SACW) and the equatorward, well–aerated Eastern South Atlantic Central Water (ESACW) drive the seasonality of nitrogen processes in the Benguela. Subsequent nitrite reduction in the Benguela OMZ leads to nitrous oxide production, with high concentrations occurring in the ABF region as a result of nitrification and denitrification. Off Walvis Bay, nitrous oxide production is low since nitrite is consumed by anammox. Nitrous oxide production occurs in thermocline, intermediate and deeper water masses in the ABF region. High N fluxes in the Benguela are attributed to nitrification as compared to anammox and denitrification. Results from this study demonstrate the role of intermediate nitrogen species in nitrogen feedback processes in the Benguela and can be applied in other regions.
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Anammox,Benguela,Denitrification,Oxygen minimum zone,Nitrite,Nitrous oxide
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要点】:本研究利用耦合物理-生物地球化学模型研究了 Benguela 氧气最小区(OMZ)中硝态氮动态及其反馈过程,揭示了硝态氮在海洋氮循环中的关键作用。

方法】:通过耦合物理-生物地球化学模型模拟了 Benguela OMZ 中硝态氮的动态变化及其与生物地球化学过程的相互作用。

实验】:使用该模型在 Benguela OMZ 进行模拟实验,数据集名称未提及。模拟结果显示了 Benguela 陆架水中的初级和次级硝态氮最大值,并分析了其形成原因及消耗过程。