Understanding why the volume of suboxic waters does not increase over centuries of global warming in an Earth System Model
Understanding why the volume of suboxic waters does not increase over centuries of global warming in an Earth System Model
复制标题
了解为什么地球系统模型中的低氧水量在几个世纪的全球变暖过程中没有增加
DOI：
10.5194/bg-9-1159-2012
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发表时间：
2012
期刊：
影响因子：
4.9
通讯作者：
J. John
中科院分区：
文献类型：
--
作者：
A. Gnanadesikan;J. Dunne;J. John
抽象。预计全球变暖将减少海洋中氧的溶解度和垂直交换，预计这些变化将导致缺氧沃茨的体积增加。用一个完整的地球系统模型（地球物理流体动力学实验室的地球系统模型2.1）进行的模拟显示，如果缺氧条件设定得相对较高，这是正确的。然而，最缺氧的体积（即，在全球变暖的情况下，低氧）沃茨不会增加，因为这些沃茨实际上变得更加含氧。我们表明，在热带太平洋的溶解氧的上升与通风时间的下降。在含氧最少的沃茨内的逐项分析表明，由于横向扩散补偿了这些高度缺氧的沃茨内的矿化增加，溶解氧的供应增加。这种横向扩散通量是增加通风的结果沿着智利海岸，作为干燥的区域在全球变暖打开了一个区域的冬季对流在我们的模型。结果突出了潜在的敏感性，亚热带通风的变化，以及限制溶解氧在这样的沃茨的横向涡流输送的重要性，亚氧沃茨。
Abstract. Global warming is expected to reduce oxygen solubility and vertical exchange in the ocean, changes which would be expected to result in an increase in the volume of hypoxic waters. A simulation made with a full Earth System model with dynamical atmosphere, ocean, sea ice and biogeochemical cycling (the Geophysical Fluid Dynamics Laboratory's Earth System Model 2.1) shows that this holds true if the condition for hypoxia is set relatively high. However, the volume of the most hypoxic (i.e., suboxic) waters does not increase under global warming, as these waters actually become more oxygenated. We show that the rise in dissolved oxygen in the tropical Pacific is associated with a drop in ventilation time. A term-by-term analysis within the least oxygenated waters shows an increased supply of dissolved oxygen due to lateral diffusion compensating an increase in remineralization within these highly hypoxic waters. This lateral diffusive flux is the result of an increase of ventilation along the Chilean coast, as a drying of the region under global warming opens up a region of wintertime convection in our model. The results highlight the potential sensitivity of suboxic waters to changes in subtropical ventilation as well as the importance of constraining lateral eddy transport of dissolved oxygen in such waters.
影响因子：
5.2
作者：
Duteil, O.;Oschlies, A.
通讯作者：
Oschlies, A.