Generation and backreaction of spontaneously emitted inertia-gravity waves
Generation and backreaction of spontaneously emitted inertia-gravity waves
复制标题
自发发射的惯性重力波的产生和反反应
DOI：
10.1002/2016gl068219
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发表时间：
2016
影响因子：
5.2
通讯作者：
Norihiko Sugimoto and Riwal Plougonven
中科院分区：
文献类型：
--
作者：
濱野景子;阿部豊;河原創;大西将徳;はしもとじょーじ;横井覚;Norihiko Sugimoto and Riwal Plougonven
在偶极子的理想化模拟中研究了平衡流中惯性重力波的自发产生。长积分的偶极子与不同的Rossby数（Ro），以确定波的反作用。只有当Ro足够大（>0.15）时才能检测到波的发射，然后它会导致偶极子动能的缓慢衰减。一个主要的发现是，这种衰减是很好地捕捉到的模拟，虽然波的位置似乎仍然敏感的分辨率，其最大垂直速度与分辨率线性增加。的解释是，发射过程是很好地解决和相当不敏感的分辨率，而在小尺度的传播和耗散仍然敏感的分辨率。这意味着，模拟产生的能量从平衡运动到重力波泄漏的估计，提供了一个有用的估计，在海洋的能量预算约束不佳的通量。
Spontaneous generation of inertia‐gravity waves from balanced flows is investigated in idealized simulations of dipoles. Long integrations are performed for dipoles with different Rossby numbers (Ro) to identify the backreaction of the waves. Emission of waves is detected only for large enoughRo(>0.15), and it then leads to a slow decay of the dipole's kinetic energy. A major finding is that this decay is well captured by the simulations, although positions of the waves appear still sensitive to the resolution, and their maximum vertical velocity increases linearly with resolution. The interpretation is that the emission process is well resolved and fairly insensitive to resolution, while the propagation and dissipation at small scales remains sensitive to resolution. The implication is that the simulations yield an estimate of the leakage of energy from balanced motions to gravity waves, providing a useful estimate of a poorly constrained flux in the ocean's energy budget.