Complex functionality with minimal computation: Promise and pitfalls of reduced-tracer ocean biogeochemistry models
Complex functionality with minimal computation: Promise and pitfalls of reduced-tracer ocean biogeochemistry models
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DOI：
10.1002/2015ms000463
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发表时间：
2015-12-01
影响因子：
6.8
通讯作者：
Marvasti, Seyedehsafoura Sedigh
中科院分区：
文献类型：
--
作者：
Galbraith, Eric D.;Dunne, John P.;Marvasti, Seyedehsafoura Sedigh
地球系统模型越来越多地包括海洋生态地球化学模型，以预测气候变化下海洋碳储量，缺氧和生物生产力的变化。然而，国家的最先进的海洋地球化学模型包括许多平流示踪剂，显着增加所需的计算资源，迫使空间分辨率的权衡。在这里，我们比较了一个最先进的模型与30个预测示踪剂（黄玉）与两个减少示踪剂的模型，一个有6个示踪剂（BLING），另一个有3个示踪剂（miniBLING）。减少示踪剂模型采用参数化的，隐含的生物功能，但捕捉到许多最重要的黄玉解决的过程。所有这三个都嵌入在同一个耦合气候模型中。尽管在示踪剂的数量有很大的差异，没有示踪剂的活有机物被证明有一个最小的影响，营养元素的运输，和三个模型产生类似的平均年前工业化分布的宏量营养素，氧和碳。模型之间确实存在重大差异，特别是生物量和出口生产的季节性周期，但似乎这些都不是示踪剂数量减少的必然后果。随着CO2的增加，溶解氧和人为碳吸收的变化在不同的模型中非常相似。因此，虽然减少示踪剂模型没有明确解决海洋生态系统的多样性和内部动态，我们表明，这种模型是适用于一个广泛的套件的主要生物地球化学的关注，包括人为变化。这些结果对于进一步发展和应用包含亚生态系统尺度参数化的减少示踪剂的生态地球化学模型是非常有希望的。
Earth System Models increasingly include ocean biogeochemistry models in order to predict changes in ocean carbon storage, hypoxia, and biological productivity under climate change. However, state-of-the-art ocean biogeochemical models include many advected tracers, that significantly increase the computational resources required, forcing a trade-off with spatial resolution. Here, we compare a state-of-the art model with 30 prognostic tracers (TOPAZ) with two reduced-tracer models, one with 6 tracers (BLING), and the other with 3 tracers (miniBLING). The reduced-tracer models employ parameterized, implicit biological functions, which nonetheless capture many of the most important processes resolved by TOPAZ. All three are embedded in the same coupled climate model. Despite the large difference in tracer number, the absence of tracers for living organic matter is shown to have a minimal impact on the transport of nutrient elements, and the three models produce similar mean annual preindustrial distributions of macronutrients, oxygen, and carbon. Significant differences do exist among the models, in particular the seasonal cycle of biomass and export production, but it does not appear that these are necessary consequences of the reduced tracer number. With increasing CO2, changes in dissolved oxygen and anthropogenic carbon uptake are very similar across the different models. Thus, while the reduced-tracer models do not explicitly resolve the diversity and internal dynamics of marine ecosystems, we demonstrate that such models are applicable to a broad suite of major biogeochemical concerns, including anthropogenic change. These results are very promising for the further development and application of reduced-tracer biogeochemical models that incorporate sub-ecosystem-scale parameterizations.