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Air masses, Atmospheric motion

机译：空气群众，大气动作

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The dynamics of the deep recirculation offshore of the deep western boundary current(DWBC) between 15° and 30°N within the upper North Atlantic Deep Water layer (1000 ≤ z ≤ 3000 m) is investigated with two different eddyresolving numerical simulations. Despite some differences in the recirculation cells, our assessment of the modeled deep isopycnal circulation patterns (36.77 ≤ σ_2 ≤ 37.06 kgnv~(-3)) shows that both simulations predict the DWBC flowing southward along the continental slope, while the so-called Abaco Gyre and two additional cyclonic cells re-circulate waters northward in the interior. These cells are a few degrees wide, located along the DWBCpath, and characterized by potential vorticity (PV) changes occurring along their mean streamlines. The analysis of the mean PV budget reveals that these changes result from the action of eddy forcing that tends to erode the PV horizontal gradients. The lack of a major uppero-cean boundary current within the study region, and the fact that the strongest eddy forcing is constrained within a few hundreds of kilometers of the western boundary, suggest that the DWBC is the primary source of eddy forcing. Finally, the eddies responsible for forcing the recirculation have dominant time scales between 100 and 300 days, which correspond to the primary observed variability scales of the DWBC transport at 26.5°N.
机译：深度沿北大西洋深水层（1000≤Z≤3000M）的深度近界电流（DWBC）的深度循环近海的动力学进行了两种不同的eddysolving数值模拟。尽管循环细胞存在一些差异，但我们对模型深层等渗循环模式的评估（36.77≤Σ_2≤37.06kgnv〜（-3））表明，两种模拟都预测了沿着大陆坡向南流动的DWBC，而所谓的股票市GYRE和两种额外的旋风细胞在内部向北重新循环水域。这些细胞是沿DWBCPATH的几度宽，并且通过沿其平均流线发生的潜在涡度（PV）变化的特征。对平均光伏预算的分析表明，这些变化由涡流强制的动作导致倾向于侵蚀PV水平梯度。在研究区内缺乏主要的跨度边界电流，以及最强的涡流强制在西部边界的几百公里范围内限制，表明DWBC是涡流强迫的主要来源。最后，负责迫使再循环的漩涡具有100至300天的主要时间尺度，其对应于26.5°N的DWBC传输的主要观察到的可变性尺度。

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    《Oceanographic Literature Review》 |2021年第3期|504-506|共3页
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