On the spatial and temporal distribution of near-inertial energy in the Southern Ocean
On the spatial and temporal distribution of near-inertial energy in the Southern Ocean
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DOI：
10.1002/2013jc009246
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发表时间：
2014
影响因子：
--
通讯作者：
W. Rath;R. Greatbatch;Xiaoming Zhai
中科院分区：
文献类型：
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作者：
W. Rath;R. Greatbatch;Xiaoming Zhai
[1]我们使用一个真实的南大洋涡动连续方程模型来研究南大洋近惯性风能输入（WPI）和近惯性能量（NIE）的时空分布。我们发现，模拟的近惯性WPI几乎是成正比的惯性风应力方差（IWSV），而模拟的NIE调制的混合层深度的倒数。我们继续评估近惯性WPI的趋势，IWSV再分析风应力的基础上，从最近的十年趋势。在南大洋，年平均IWSV在1979-2011年期间增加了16%。部分IWSV的增加被认为与同期南环模态的正趋势有关。最后，我们发现，有水平的局部最大值的NIE在深度几乎完全与反气旋涡。
[1] We use an eddying realistic primitive-equation model of the Southern Ocean to examine the spatial and temporal distribution of near-inertial wind-power input (WPI) and near-inertial energy (NIE) in the Southern Ocean. We find that the modeled near-inertial WPI is almost proportional to inertial wind-stress variance (IWSV), while the modeled NIE is modulated by the inverse of the mixed-layer depth. We go on to assess recent decadal trends of near-inertial WPI from trends of IWSV based on reanalysis wind stress. Averaged over the Southern Ocean, annual-mean IWSV is found to have increased by 16% over the years 1979–2011. Part of the increase of IWSV is found to be related to the positive trend of the Southern-Annular Mode over the same period. Finally, we show that there are horizontal local maxima of NIE at depth that are almost exclusively associated with anticyclonic eddies.