Major role of the equatorial current system in setting oxygen levels in the eastern tropical Atlantic Ocean: A high‐resolution model study

Major role of the equatorial current system in setting oxygen levels in the eastern tropical Atlantic Ocean: A high‐resolution model study
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赤道洋流系统在设定东热带大西洋含氧量方面的主要作用:高分辨率模型研究

DOI:
10.1002/2013gl058888
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发表时间:
2014
影响因子:
5.2
通讯作者:
Oschlies
Oschlies
中科院分区:
地球科学1区
文献类型:
--
作者:
Duteil;Schwarzkopf;Böning;Oschlies

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气候模型中氧分布的表示存在很大的偏差,指出了错误的表示机制,阻碍了对观测到的热带海洋氧气最小区(OMZ)扩大的原因的理解。在这里,我们评估了以大西洋为重点的全球生物地球化学环流模型中的氧气收支。粗糙的(0.5°)构型显示出过大和过强的OMZ的共同偏差,而涡流(0.1°)构型的氧浓度更高,更接近观测。这种改善可以追溯到更强劲的氧气供应,因为更真实地呈现了赤道和赤道外的潜流,超过了与更强劲的营养供应相关的氧气消耗的同时增加。东热带大西洋氧收支对赤道洋流强度的敏感性表明,从氧气充足的西部边界地区向东输送的氧的时间变化可能部分解释了OMZ的变化。
Understanding the causes of the observed expansion of tropical ocean's oxygen minimum zones (OMZs) is hampered by large biases in the representation of oxygen distribution in climate models, pointing to incorrectly represented mechanisms. Here we assess the oxygen budget in a global biogeochemical circulation model, focusing on the Atlantic Ocean. While a coarse (0.5°) configuration displays the common bias of too large and too intense OMZs, the oxygen concentration in an eddying (0.1°) configuration is higher and closer to observations. This improvement is traced to a stronger oxygen supply by a more realistic representation of the equatorial and off‐equatorial undercurrents, outweighing the concurrent increase in oxygen consumption associated with the stronger nutrient supply. The sensitivity of the eastern tropical Atlantic oxygen budget to the equatorial current intensity suggests that temporal changes in the eastward oxygen transport from the well‐oxygenated western boundary region might partly explain variations in the OMZs.
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