The North Atlantic subpolar circulation in an eddy-resolving global ocean model
The North Atlantic subpolar circulation in an eddy-resolving global ocean model
复制标题
DOI：
10.1016/j.jmarsys.2014.10.007
复制
发表时间：
2015-02-01
影响因子：
2.8
通讯作者：
Coward, Andrew C.
中科院分区：
文献类型：
--
作者：
Marzocchi, Alice;Hirschi, Joel J. -M.;Coward, Andrew C.
北大西洋副极地是全球气候的一个关键区域，但大多数数值模式在正确模拟当地环流模式方面仍然存在局限性。在这里，我们提出了一个30年的运行分析与全球涡旋解决（1/12度）版本的NEMO海洋模式。与1度和1/4度等效版本相比，该模拟更真实地表示了副极地环流的形状，北大西洋洋流的位置和墨西哥湾流分离。其他关键的改进被发现在边界电流的代表性，多年的温度变化和拉布拉多海冬季混合的深度，并在格陵兰岛，苏格兰海脊的溢出运输。然而，拉布拉多海冬季混合的盐度、分层和平均深度，以及岩床南部溢流水的密度和深度，仍然对模型提出了挑战。这一模拟还提供了进一步的洞察到的变暖事件在副极地环流在1990年代中期，这似乎是在最南端的涡旋活动增加的一个阶段相吻合的时空发展。这可能提供了一个通道，热量可以通过这个通道传播到环流的内部。(C)2014作者由爱思唯尔公司出版
The subpolar North Atlantic represents a key region for global climate, but most numerical models still have well-described limitations in correctly simulating the local circulation patterns. Here, we present the analysis of a 30year run with a global eddy-resolving (1/12 degrees) version of the NEMO ocean model. Compared to the 1 degrees and 1/4 degrees equivalent versions, this simulation more realistically represents the shape of the Subpolar Gyre, the position of the North Atlantic Current, and the Gulf Stream separation. Other key improvements are found in the representation of boundary currents, multi-year variability of temperature and depth of winter mixing in the Labrador Sea, and the transport of overflows at the Greenland-Scotland Ridge. However, the salinity, stratification and mean depth of winter mixing in the Labrador Sea, and the density and depth of overflow water south of the sill, still present challenges to the model. This simulation also provides further insight into the spatio-temporal development of the warming event observed in the Subpolar Gyre in the mid 1990s, which appears to coincide with a phase of increased eddy activity in the southernmost part of the gyre. This may have provided a gateway through which heat would have propagated into the gyre's interior. (C) 2014 The Authors. Published by Elsevier B.V.