Energetic Topographic Rossby Waves in the Northern South China Sea
Energetic Topographic Rossby Waves in the Northern South China Sea
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南海北部的高能地形罗斯贝波
DOI：
10.1175/jpo-d-18-0247.1
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发表时间：
2019-10
影响因子：
3.5
通讯作者：
Zhou Weidong
中科院分区：
文献类型：
--
作者：
Wang Qiang;Zeng Lili;Shu Yeqiang;Li Jian;Chen Ju;He Yunkai;Yao Jinglong;Wang Dongxiao;Zhou Weidong
据报道，地形Rossby波(TRW)对深海海流的变化有重要的贡献。在南海中国海北部陆坡上，在东沙群岛东西走向的深泊处，一年多的时间里观测到了谱能量峰值为14.5d的TRW。群速度为O(10)cm S−1的TRW对两个系泊站底速波动的贡献率超过40%。使用射线跟踪模型进一步识别能量传播和源。TRW能量主要沿NSCS陆坡向西传播，并有少量下坡成分。可能的能量来源是东沙群岛东侧10-20天的上层海洋波动，这种波动通过第一斜压模式(即第二EOF模式)传递。上层海洋的这些10-20天的波动与中尺度涡旋有关。然而，在东沙群岛以西，上层海洋10-20天的波动太弱，不能有效地在当地产生TRW。这项工作为理解NSCS深部洋流的变异性以及上层洋流和深海洋流之间的联系提供了有趣的见解。
Topographic Rossby waves (TRWs) are reported to make a significant contribution to the deep-ocean current variability. On the northern South China Sea (NSCS) continental slope, TRWs with peak spectral energy at ~14.5 days are observed over about a year at deep moorings aligned east–west around the Dongsha Islands. The TRWs with a group velocity of O(10) cm s−1 contribute more than 40% of total bottom velocity fluctuations at the two mooring stations. The energy propagation and source are further identified using a ray-tracing model. The TRW energy mainly propagates westward along the NSCS continental slope with a slight downslope component. The possible energy source is upper-ocean 10–20-day fluctuations on the east side of the Dongsha Islands, which are transferred through the first baroclinic mode (i.e., the second EOF mode). These 10–20-day fluctuations in the upper ocean are associated with mesoscale eddies. However, to the west of the Dongsha Islands, the 10–20-day fluctuations in the upper ocean are too weak to effectively generate TRWs locally. This work provides an interesting insight toward understanding the NSCS deep current variability and the linkage between the upper- and deep-ocean currents.
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南海北部东沙群岛周围海流偏转分析
影响因子：
3.6
作者：
Zhou, Weidong;Cai, Shuqun;Li, Li;Hong, Bo
通讯作者：
Hong, Bo
影响因子：
3.5
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
0.5
作者：
JOHNS, WE;WATTS, DR
通讯作者：
WATTS, DR
DOI：
10.1016/s0422-9894(08)x7037-0
发表时间：
1978
期刊：
--
影响因子：
--
作者：
P. Leblond;L. Mysak
通讯作者：
P. Leblond;L. Mysak