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首页> 外文期刊>Estuarine Coastal and Shelf Science >Modeling biogeochemical cycles in Chesapeake Bay with a coupled physical—biological model
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Modeling biogeochemical cycles in Chesapeake Bay with a coupled physical—biological model

机译：切萨皮克湾的生物地球化学循环与物理-生物模型耦合

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In this paper we describe the development and validation of a relatively simple biogeochemical model of Chesapeake Bay. This model consists of a 3-dimensional, prognostic hydrodynamic model that is coupled to an NPZD-type open ocean ecosystem model, which has been modified by adding additional compartments and parameterizations of biogeochemical processes that are important in estuarine systems. These modifications include an empirical optical model for predicting the diffuse attenuation coefficient K_d, compartments for representing oxygen and suspended sediment concentrations, and parameterizations of phosphorus limitation, denitrification, and seasonal changes in ecosystem structure and temperature effects. To show the overall performance of the coupled physical—biological model, the modeled dissolved inorganic nitrogen, phytoplankton, dissolved oxygen, total suspended solids and light attenuation coefficient in 1995 (a dry year) and 1996 (a very wet year) are examined and compared with observations obtained from the Chesapeake Bay Program. We demonstrate that this relatively simple model is capable of producing the general distribution of each field (both the mean and variability) in the main stem of the Bay. And the model is robust enough to generate reasonable results under both wet and dry conditions. Some significant discrepancies are also observed, such as overestimation of phytoplankton concentrations in shoal regions and overestimation of oxygen concentrations in deep channels, which reveal some deficiencies in the model formulation. Some potential improvements and remedies are suggested. Sensitivity studies on selected parameters are also reported.
机译：在本文中，我们描述了切萨皮克湾一个相对简单的生物地球化学模型的开发和验证。该模型由一个3维，可预测的水动力模型组成，该模型与NPZD型开放海洋生态系统模型相结合，该模型已通过添加在河口系统中重要的生物地球化学过程的附加区室和参数化进行了修改。这些修改包括用于预测扩散衰减系数K_d的经验光学模型，用于表示氧气和悬浮沉积物浓度的隔室，以及磷限制，反硝化以及生态系统结构和温度影响的季节性变化的参数化。为了显示物理-生物耦合模型的整体性能，对1995年（干旱年份）和1996年（非常潮湿的年份）中溶解的无机氮，浮游植物，溶解的氧，总悬浮固体和光衰减系数的模型进行了检查和比较从切萨皮克湾计划获得的观察结果。我们证明，这个相对简单的模型能够产生海湾主干中每个场的总体分布（均值和变异性）。该模型的鲁棒性足以在潮湿和干燥条件下产生合理的结果。还观察到一些显着差异，例如高估浅滩区的浮游植物浓度和高估深层通道中的氧气浓度，这表明模型制定存在一些缺陷。建议了一些潜在的改进和补救措施。还报道了对所选参数的敏感性研究。

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