Features of Slope Intrusion Mesoscale Eddies in the Northern South China Sea
Features of Slope Intrusion Mesoscale Eddies in the Northern South China Sea
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DOI：
10.1029/2019jc015349
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发表时间：
2020-02
影响因子：
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通讯作者：
Danyi Su;P. Lin;H. Mao;Jiaxue Wu;Hailong Liu;Yongsheng Cui;C. Qiu
中科院分区：
文献类型：
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作者：
Danyi Su;P. Lin;H. Mao;Jiaxue Wu;Hailong Liu;Yongsheng Cui;C. Qiu
引用：邱春华；南中国海北部斜坡入侵中尺度涡旋特征；2021年欧洲气候变化；11月17日；法国巴黎。《全球气候变化和海洋学中的挑战》第二版，2021年11月17日；法国巴黎。摘要：一些中尺度涡旋侵入了南海北部的陆坡，支持了跨陆架物质的输送。利用卫星高度计资料和模式资料研究了斜坡入侵中尺度涡旋的特征、侵入路径和形成机制。共发现36个斜坡入侵反气旋涡旋和22个斜坡入侵气旋涡旋(SAES/SCES)。与普通涡旋相比，斜坡入侵涡的寿命更长(~58天)，尺度更小(~110公里)，涡动动能和涡度更大，但在生命周期中更不稳定，更容易变形。统计结果表明，冬季产生的坡面入侵涡比其他季节多。结果表明，坡面入侵涡主要向西/西北方向传播，沿陆坡和陆架向西南方向传播。涡旋入侵主要发生在东沙群岛附近、海南以东和西沙群岛以北。在到达陆坡后，SAE继续在岸上传播，而SCE消散得更快。利用系泊资料，我们发现涡流与环境流的相互作用可能会导致东沙群岛附近海域的海流和海流的差异。利用数值产品对这三个区域的能量转换进行了分析。在入侵过程中，涡流失去了涡动动能，而周围的气流获得了能量。
Citation: Qiu Chunhua; Features of slope intrusion mesoscale eddies in the northern South China Sea; Euro Climate Change 2021; November 17; Paris, France. 2nd Edition of Challenges in Global Climate Change and Oceanography, Nov 17, 2021; Paris, France. Abstract: Some mesoscale eddies intrude over the continental slope in the northern South China Sea (NSCS), supporting cross-shelf matter transport. We investigated the characteristics, the intruding tracks and formation mechanisms, of slope intrusion mesoscale eddies using satellite altimeter data and model outputs. In total, 36 and 22 slope intrusion anticyclonic and cyclonic eddies (SAEs/SCEs) are found, respectively. Slope intrusion eddies have longer lifetimes (~ 58 days), smaller size (~ 110 km), and greater eddy kinetic energy (EKE) and vorticity compared to ordinary eddies, but are more unstable and more easily deformed during their life cycles. The statistical results show that more slope intrusion eddies are generated during winter than other seasons. It is found that slope intrusion eddies mainly propagate west/northwestward, and southwestward along the continental slope and shelf. Eddy intrusions occur mainly near the Dongsha Islands, east of Hainan, and north of the Xisha Islands. SAEs continue to propagate onshore after arrival at the continental slope, while SCEs dissipate more quickly. Using mooring data, we found that eddy-ambient flow interaction could cause the differences between SAEs and SCEs around the Dongsha Islands. Energy conversion was analyzed in these three regions using numerical products. During intrusion, eddies lose eddy kinetic energy and ambient flows gain energy.