A two-way nested simulation of the oceanic circulation in the Southwestern Atlantic
A two-way nested simulation of the oceanic circulation in the Southwestern Atlantic
复制标题
西南大西洋海洋环流的双向嵌套模拟
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
R. Matano
中科院分区：
文献类型：
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作者：
V. Combes;R. Matano
本文介绍了西南大西洋地区海洋环流的高分辨率（1/12°）双向嵌套模拟结果。模式结果与现有观测结果的比较表明，嵌套模式在再现区域环流中最著名的方面，如ACC的体积输送、BMC的纬度位置、巴塔哥尼亚大陆架断裂上升流和Zapiola反气旋方面具有一定的能力。灵敏度实验表明，底部应力参数化对巴西/马尔维纳斯合流的平均位置和Zapiola反气旋的输送有显著影响。巴西流的输送在南方夏季增强，在南方冬季减弱。这些变化是由西南大西洋上的风应力旋度驱动的。马尔维纳斯海流的输运变化与巴西海流的输运变化不一致。该流的大部分季节性变化集中在喷流的近海部分，近海部分具有微弱的季节性，调节了巴塔哥尼亚陆架断裂上升流的幅度。利用被动示踪剂，我们发现大部分深水被夹带进入大陆架发生在巴塔哥尼亚大陆架的最南端和沿着巴西洋流的近海边界。大陆架水域优先在巴西/马尔维纳斯汇合处附近进行排水。与先前的研究一致，我们的模拟还表明，在~ 42°S以南，马尔维纳斯流由两个射流组成，它们在42°S附近合并，形成一个更北的单一射流。
This article presents the results of a high-resolution (1/12°), two-way nested simulation of the oceanic circulation in the southwestern Atlantic region. A comparison between the model results and extant observations indicates that the nested model has skill in reproducing the best-known aspects of the regional circulation, e.g., the volume transport of the ACC, the latitudinal position of the BMC, the shelf break upwelling of Patagonia, and the Zapiola Anticyclone. Sensitivity experiments indicate that the bottom stress parameterization significantly impacts the mean location of the Brazil/Malvinas Confluence and the transport of the Zapiola Anticyclone. The transport of the Brazil Current strengthens during the austral summer and weakens during the austral winter. These variations are driven by the wind stress curl over the southwestern Atlantic. The variations of the transport of the Malvinas Current are out of phase with those of the Brazil Current. Most of the seasonal variability of this current is concentrated in the offshore portion of the jet, the inshore portion has a weak seasonality that modulates the magnitude of the Patagonian shelf break upwelling. Using passive tracers we show that most of the entrainment of deep waters into the shelf occurs in the southernmost portion of the Patagonian shelf and along the inshore boundary of the Brazil Current. Shelf waters are preferentially detrained near the Brazil/Malvinas Confluence. Consistent with previous studies, our simulation also shows that south of ∼42°S the Malvinas Current is composed of two jets, which merge near 42°S to form a single jet farther north.
DOI：
10.1016/j.dsr.2009.06.005
发表时间：
2009-11
期刊：
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影响因子：
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作者：
I. Núñez‐Riboni;E. Fahrbach
通讯作者：
I. Núñez‐Riboni;E. Fahrbach