A dynamic marine iron cycle module coupled to the University of Victoria Earth System Model: the Kiel Marine Biogeochemical Model 2 for UVic 2.9
A dynamic marine iron cycle module coupled to the University of Victoria Earth System Model: the Kiel Marine Biogeochemical Model 2 for UVic 2.9
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DOI：
10.5194/gmd-8-1357-2015
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发表时间：
2015-01-01
影响因子：
5.1
通讯作者：
Oschlies, A.
中科院分区：
文献类型：
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作者：
Nickelsen, L.;Keller, D. P.;Oschlies, A.
许多海洋区域的海洋生物生产以及相关的生物碳吸收取决于真光层营养物质的供应情况。虽然氮和/或磷限制了大面积，但微量营养素铁被认为是北太平洋、赤道太平洋和南大洋的主要限制性营养素。通过大气粉尘输入的变化，铁的可用性的变化进行了讨论，通过生物海洋碳封存的变化引起的气候反馈在冰川间冰期循环中发挥重要作用。虽然铁循环的许多方面仍然未知，但需要将其纳入海洋生物地球化学模型，以测试我们目前的理解，并更好地限制其在地球系统中的作用。在维多利亚大学地球系统气候模式（UVic）中，到目前为止，海洋中的铁限制是用铁浓度掩蔽方案务实地模拟的，该方案不允许对海洋地球化学或铁循环敏感性研究的扰动做出一致的交互反应。在这里，我们取代铁掩蔽计划与动态铁循环，并比较现有的观测结果和以前的海洋生物地球化学模型。敏感性研究也进行了新的模式，以测试参数化的铁配体浓度的模型的敏感性，考虑可变的溶解度的铁在灰尘沉积的重要性，考虑高分辨率水深测量的沉积物释放铁的重要性，缩放沉积铁释放与温度的影响和铁循环的敏感性气候变化的情况。
Marine biological production as well as the associated biotic uptake of carbon in many ocean regions depends on the availability of nutrients in the euphotic zone. While large areas are limited by nitrogen and/or phosphorus, the micronutrient iron is considered the main limiting nutrient in the North Pacific, equatorial Pacific and Southern Ocean. Changes in iron availability via changes in atmospheric dust input are discussed to play an important role in glacial-interglacial cycles via climate feedbacks caused by changes in biological ocean carbon sequestration. Although many aspects of the iron cycle remain unknown, its incorporation into marine biogeochemical models is needed to test our current understanding and better constrain its role in the Earth system. In the University of Victoria Earth System Climate Model (UVic) iron limitation in the ocean was, until now, simulated pragmatically with an iron concentration masking scheme that did not allow a consistent interactive response to perturbations of ocean biogeochemistry or iron cycling sensitivity studies. Here, we replace the iron masking scheme with a dynamic iron cycle and compare the results to available observations and the previous marine biogeochemical model. Sensitivity studies are also conducted with the new model to test the sensitivity of the model to parameterized iron ligand concentrations, the importance of considering the variable solubility of iron in dust deposition, the importance of considering high-resolution bathymetry for the sediment release of iron, the effect of scaling the sedimentary iron release with temperature and the sensitivity of the iron cycle to a climate change scenario.