Biogeochemical modelling of dissolved oxygen in a changing ocean
Biogeochemical modelling of dissolved oxygen in a changing ocean
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DOI：
10.1098/rsta.2016.0328
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发表时间：
2017-09-13
期刊：
影响因子：
5
通讯作者：
Suntharalingam, Parvadha
中科院分区：
文献类型：
--
作者：
Andrews, Oliver;Buitenhuis, Erik;Suntharalingam, Parvadha
在过去大约50年里，在热带最低含氧区和中高纬度地区观察到溶解氧浓度长期下降。地球系统模型预测表明，全球海洋氧存量的减少，称为海洋脱氧，可能是持续的人为变暖的后果。然而，目前的模型无法始终如一地再现近几十年来观察到的趋势和变化，特别是在已建立的热带外边界区内。在这里，我们进行了一系列有针对性的后报模型模拟使用国家的最先进的全球海洋生物地球化学模型，以探索和审查海洋氧模型分布的偏差。我们发现，最大幅度的不确定性是夹带到海洋氧气响应模式，由于模型参数化的pCO（2）敏感的C：N比在碳固定和强加的大气强迫数据。包括pCO（2）-敏感的C：N比驱动历史上的海洋内部的氧气消耗，由于增加有机碳输出和随后的再矿化。大气强迫被证明会影响模拟的海洋氧的年际变化，特别是由于风应力和热通量的变化所造成的差异。这篇文章是主题问题“海洋通风和脱氧在变暖的世界”的一部分。
Secular decreases in dissolved oxygen concentration have been observed within the tropical oxygen minimum zones (OMZs) and at mid-to high latitudes over the last approximately 50 years. Earth system model projections indicate that a reduction in the oxygen inventory of the global ocean, termed ocean deoxygenation, is a likely consequence of on-going anthropogenic warming. Current models are, however, unable to consistently reproduce the observed trends and variability of recent decades, particularly within the established tropical OMZs. Here, we conduct a series of targeted hindcast model simulations using a state-of-the-art global ocean biogeochemistry model in order to explore and review biases in model distributions of oceanic oxygen. We show that the largest magnitude of uncertainty is entrained into ocean oxygen response patterns due to model parametrization of pCO(2)-sensitive C: N ratios in carbon fixation and imposed atmospheric forcing data. Inclusion of a pCO(2)-sensitive C: N ratio drives historical oxygen depletion within the ocean interior due to increased organic carbon export and subsequent remineralization. Atmospheric forcing is shown to influence simulated interannual variability in ocean oxygen, particularly due to differences in imposed variability of wind stress and heat fluxes.This article is part of the themed issue 'Ocean ventilation and deoxygenation in a warming world'.