Persistent and energetic bottom-trapped topographic Rossby waves observed in the southern South China Sea.
Persistent and energetic bottom-trapped topographic Rossby waves observed in the southern South China Sea.
复制标题
南海南部观测到持续且充满活力的底部陷阱地形罗斯贝波
DOI：
10.1038/srep24338
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发表时间：
2016-04-14
影响因子：
4.6
通讯作者：
He Y
中科院分区：
文献类型：
--
作者：
Shu Y;Xue H;Wang D;Chai F;Xie Q;Cai S;Chen R;Chen J;Li J;He Y
通过5年的直接观测，在南海南部1400 m深度以下观测到了周期为9-14天的能量波动。我们解释这种波动的地形Rossby波（TRW），因为它们服从色散关系。TRW从2009年5月24日持续到2013年8月23日，其底流速度最大值约为10 cm/s，比平均流速大一个数量级，与底部附近的潮流相当。底部捕获的TRW的捕获深度约为325 m，参考波长约为82 km，这可能是由上面的涡旋激发的。上层流速每2个月达到一个峰值，可为南海南部持续存在的TRW提供能量来源。在地形复杂的地区，高能底陷TRW在深环流中可能具有与潮汐相当的作用。
Energetic fluctuations with periods of 9–14 days below a depth of 1400 m were observed in the southern South China Sea (SCS) from 5 years of direct measurements. We interpreted such fluctuations as topographic Rossby waves (TRWs) because they obey the dispersion relation. The TRWs persisted from May 24, 2009 to August 23, 2013, and their bottom current speed with a maximum of ~10 cm/s was one order of magnitude greater than the mean current and comparable to the tidal currents near the bottom. The bottom-trapped TRWs had an approximate trapping depth of 325 m and reference wavelength of ~82 km, which were likely excited by eddies above. Upper layer current speed that peaked approximately every 2 months could offer the energy sources for the persistent TRWs in the southern SCS. Energetic bottom-trapped TRWs may have a comparable role in deep circulation to tides in areas with complex topography.