N-losses and nutrient regeneration in oxygen minimum zone waters with emphasis on micro-niches (B04)

氧极小区(OMZ)在调节海洋中氮(N)的有效性方面起着至关重要的作用，我们的研究结果表明，在OMZ水域中，N循环与有机质输出以及好氧和厌氧过程共存之间存在着密切的联系。我们假设，与O2、N和有机质(OM)有效性的强烈梯度相关的微生态位，例如在聚集颗粒中，限制了OMZ水域N循环的重要调节因素。通过更好地定义O2、OM和N的作用以及病毒裂解与微生态位的关系，我们的目标是改进对N循环过程的调节的机制和定量的见解，这些过程对于改进生物地球化学模型至关重要。

Oxygen minimum zones (OMZ) play a crucial role in regulating the availability of nitrogen (N) in the oceans and our results show a strong link between N cycling and organic matter export as well as co-occurrence of aerobic and anaerobic processes in OMZ waters. We hypothesize that micro-niches associated to strong gradients in O2, N and organic matter (OM) availability, e.g. in aggregate particles, constrain important regulation factors for the N-cycling in OMZ waters. By better defining the effect of O2, OM and N and viral lysis in relation to micro-niches, we aim to improve mechanistic and quantitative insights into the regulation of N-cycling processes essential to improve biogeochemical models.