Instituto de Ingeniería del Agua y del Medio Ambiente, Universitat Politècnica de València, Camino de Vera s/n, Valencia 46022, Spain.
Instituto de Ingeniería del Agua y del Medio Ambiente, Universitat Politècnica de València, Camino de Vera s/n, Valencia 46022, Spain.
Mar Pollut Bull. 2019 Aug;145:14-22. doi: 10.1016/j.marpolbul.2019.05.013. Epub 2019 May 17.
The anthropogenic alteration of the nitrogen cycle results in the modification of the whole food web. And yet, the impact caused on nitrogen dynamics in marine systems is still very uncertain. We propose a workflow to evaluate changes to coastal nitrification by modelling nitrite dynamics, the intermediary compound. Nitrite concentrations were estimated with a simple steady state nitrification model, which was calibrated in 9 NW Mediterranean coastal sites with different anthropogenic pressures, located within 250 km. The results obtained indicate that nitrite peaks are observed in winter and explained by nitrification response to temperature, but these dynamics are altered in impacted coastal waters. We found the second step of nitrification to be more sensitive to temperature, which entails a significant impact of climate change on the decoupling of the two steps of nitrification. The results could be extrapolated to numerous coastal regions of the Mediterranean Sea with similar characteristics.
人为改变氮循环会导致整个食物网发生变化。然而，海洋系统中氮动态所造成的影响仍然非常不确定。我们提出了一种工作流程，通过模拟中间化合物亚硝酸盐的动态来评估沿海硝化作用的变化。亚硝酸盐浓度是用一个简单的稳态硝化模型估算的，该模型在具有不同人为压力的 9 个西北地中海沿海地点进行了校准，这些地点位于 250 公里范围内。所得结果表明，冬季会出现亚硝酸盐峰值，这是硝化作用对温度的响应，但这些动态在受影响的沿海水域中发生了变化。我们发现硝化作用的第二步对温度更敏感，这意味着气候变化对硝化作用两步脱耦的影响很大。这些结果可以推广到具有类似特征的地中海众多沿海地区。
