ENSO Modulates Mean Currents and Mesoscale Eddies in the Caribbean Sea
ENSO Modulates Mean Currents and Mesoscale Eddies in the Caribbean Sea
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DOI：
10.1029/2023gl103958
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发表时间：
2023-08
影响因子：
5.2
通讯作者：
MingHai Huang;Xin‐Zhong Liang;Yang Yang-Yang;Yang Zhang
中科院分区：
文献类型：
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作者：
MingHai Huang;Xin‐Zhong Liang;Yang Yang-Yang;Yang Zhang
尽管厄尔尼诺南方涛动（ENSO）及其通过遥相关产生的全球影响已为人所知数十年，但加勒比海的平均洋流和中尺度涡旋是否以及如何与 ENSO 联系起来仍然是一个悬而未决的问题。在这里，通过分析卫星观测和海洋再分析产品，我们发现加勒比海的平均洋流、涡流和 ENSO 在年际时间尺度上存在密切联系。强烈的厄尔尼诺事件导致南北海面高度差增大，从而导致加勒比海的平均海流更强，而拉尼娜事件则相反。涡动能通过涡-平均流相互作用对 ENSO 做出响应，主要是通过斜压不稳定性，将平均流中存储的可用势能释放到中尺度涡。我们的结果表明加勒比海的平均洋流和涡流具有一定的可预测性，特别是在强烈的厄尔尼诺和拉尼娜事件期间。
Although El Niño‐Southern Oscillation (ENSO) and its global impacts through teleconnection have been known for decades, if and how the mean currents and mesoscale eddies in the Caribbean Sea are linked to ENSO remains an open question. Here, by analyzing satellite observations and an ocean reanalysis product, we found a close connection between mean currents, eddies in the Caribbean Sea and ENSO on interannual timescales. Strong El Niño events result in enhanced north‐south sea surface height differences and consequently stronger mean currents in the Caribbean Sea, and the opposite happens during La Niña events. The eddy kinetic energy responds to ENSO via eddy‐mean flow interaction, primarily through baroclinic instability, which releases the available potential energy stored in the mean currents to mesoscale eddies. Our results suggest some predictability of the mean currents and eddies in the Caribbean Sea, particularly during strong El Niño and La Niña events.