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In-stream nitrogen attenuation: Model-aggregation effects and implications for coastal nitrogen impacts

机译：流中氮的衰减：模型聚集效应及其对沿海氮的影响

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摘要

Eutrophication problems in coastal and marine waters worldwide emphasize the significance, for the Scientific community as well as the whole society, of relevant quantification of catchment-scale nitrogen transport from land to coast. Different catchment-scale nitrogen budget models use, and base management recommendations on, quite different process representations of and spatial resolution approaches to in-stream nitrogen attenuation. We compare three different spatial resolution approaches to modeling nitrogen loss rates in streams of the same drainage basin. Results show that commonly used spatial model aggregation may lead to artificial decrease of calibrated nitrogen loss rates with increasing stream depth (or flow), in addition to any such dependences that may prevail in independently measurable reality. Coastal nitrogen impact predictions and practical management implications of large-scale model aggregation of nitrogen attenuation rates may further differ considerably from those based on rates from finer resolution modeling or independent measurements.
机译：全世界沿海和海洋水域的富营养化问题强调了对科学界乃至整个社会对从陆地到海岸的集水规模氮运输的相关量化的重要性。不同的流域规模氮预算模型使用的流域氮衰减的过程表示法和空间分辨率方法完全不同，并基于管理建议。我们比较了三种不同的空间分辨率方法来模拟同一流域内河流的氮损失率。结果表明，除了可能在独立可测量的现实中普遍存在的任何此类依存关系外，常用的空间模型聚合还可能导致随着流深（或流量）的增加而人为减少校准氮的损失率。大规模的氮衰减率模型汇总对沿海氮影响的预测和实际管理的意义可能与基于更精细的建模或独立测量的率所产生的预测相差甚远。

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