Impact of eddies on ocean diapycnal mixing in Gulf Stream region
Impact of eddies on ocean diapycnal mixing in Gulf Stream region
复制标题
涡流对湾流区域海洋二重混合的影响
DOI：
10.1007/s11430-013-4708-0
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发表时间：
2014-06
期刊：
影响因子：
--
通讯作者：
Tian JiWei
中科院分区：
文献类型：
--
作者：
Li Min;Xie LingLing;Yang QingXuan;Tian JiWei
利用高分辨率Argo（实时地转海洋学阵列）剖面和海平面异常（SLA）资料，对墨西哥湾流区中尺度涡旋内外的湍流横尺度混合剖面进行了统计分析和比较。结果表明，在300-540 m深度，反气旋涡旋的平均穿流扩散率达到4.0×10 - 5 m2·s-1。这比1.6×10− 5 m2 s − 1的外涡旋和0.8×10− 5 m2 s − 1的气旋涡旋要高得多。在反气旋和气旋性涡旋内以及涡旋外，横扩散系数大于10− 4 m2 s − 1的概率分别为29%、5%和12%。然而，在540-900米深度，这三种情况下的平均贯向扩散率的量级是相同的，10 - 5 m2 s-1。在总共38个反气旋涡旋中，有24个增强了海洋内部的混合，有22个在强风期间或之后不久被观察到。增强的混合和强风应力之间的一致性表明，更多的风引起的，近惯性波能量向下传播的反气旋涡旋。反气旋涡旋中有12个剖面的较深部分（540 m以下）发生了索普尺度超过5 m的垂直翻转，其中3个剖面的翻转达到20 m。增强混合可能发生在某些剖面的深层，尽管在平均条件下并不明显。
Based on high-resolution, Array for Real-time Geostrophic Oceanography (Argo) profiles and Sea Level Anomaly (SLA) data, this study statistically analyzes and compares turbulent diapycnal mixing profiles inside and outside mesoscale eddies in the Gulf Stream region. The result indicates that average diapycnal diffusivity at 300–540 m depths in anticyclonic eddies reaches 4.0×10−5m2s−1. This is significantly higher than the 1.6×10−5m2s−1outside eddies and 0.8×10−5m2s−1in cyclonic eddies. Probabilities of diapycnal diffusivity greater than 10−4m2s−1within anticyclonic and cyclonic eddies and outside eddies are 29%, 5% and 12%, respectively. However, magnitudes of average diapycnal diffusivity at 540–900 m depths in these three cases are of the same order, 10−5m2s−1. Twenty-four of a total 38 anticyclonic eddies had enhanced mixing in the ocean interior, and 22 were observed during or shortly after strong winds. The coincidence between enhanced mixing and strong wind stress indicates that more wind-induced, near-inertial wave energy propagates downward in anticyclonic eddies. The deeper part of 12 profiles (below 540 m) in anticyclonic eddies had vertical overturns with Thorpe scale exceeding 5 m, among which three profiles had overturns reaching 20 m. Enhanced mixing may have occurred in deep layers of some profiles, although it was not evident in average conditions.
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影响因子：
56.9
作者：
Garabato, ACN;Polzin, KL;Visbeck, M
通讯作者：
Visbeck, M
影响因子：
2.2
作者：
T. Anderson;D. Covert;S. F. Marshall;M. L. Laucks;R. Charlson;A. Waggoner;J. Ogren;R. Caldow;R. L. Holm;F. R. Quant;G. Sem;A. Wiedensohler;N. Ahlquist;T. Bates
通讯作者：
T. Anderson;D. Covert;S. F. Marshall;M. L. Laucks;R. Charlson;A. Waggoner;J. Ogren;R. Caldow;R. L. Holm;F. R. Quant;G. Sem;A. Wiedensohler;N. Ahlquist;T. Bates
影响因子：
5.2
作者：
L. S. Laurent;H. Simmons;S. Jayne
通讯作者：
L. S. Laurent;H. Simmons;S. Jayne
DOI：
10.1017/cbo9780511801198.005
发表时间：
2007
期刊：
--
影响因子：
--
作者：
S. Thorpe
通讯作者：
S. Thorpe
影响因子：
8.9
作者：
P. Klein;S. L. Smith;G. Lapeyre
通讯作者：
P. Klein;S. L. Smith;G. Lapeyre