The cause of the 2008 cold disaster in the Taiwan Strait
The cause of the 2008 cold disaster in the Taiwan Strait
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2008年台海寒灾的原因
DOI：
10.1016/j.ocemod.2012.11.004
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发表时间：
2013-02-01
期刊：
影响因子：
3.2
通讯作者：
Yan, Xiaohai
中科院分区：
文献类型：
--
作者：
Liao, Enhui;Jiang, Yuwu;Yan, Xiaohai
中国沿岸流在台湾海峡的离岸分支，在张云岭以北通常作一个U形转弯。2008年初，海流继续笔直前进，并将高达14摄氏度的海水带到澎湖岛，对当地的水产养殖和珊瑚礁生态系统造成破坏。本研究利用现有资料及三维模式探讨这次冷水入侵的机制，结果显示2008年的冷水入侵可分为三个阶段。2月初，中国沿岸流的离岸分支在台湾海峡形成一个U型，当与向南的海平面和密度梯度有关的离岸地转流克服东北季风引起的陆上Ekman输送时，该分支将海峡西部的冷水输送到海峡中部。第二阶段为2月中旬，台湾海峡东北风增强，西南流增强，导致海峡中部冷水异常输送到澎湖岛。最后，在2月底，温暖的东北气流因风力减弱而重新建立，冷水逐渐向北撤退。第二个过程紧接着第一个过程发生，导致了独特的冷水入侵。(C)2012爱思唯尔有限公司保留所有权利。
The offshore branch of the China Coastal Current in the Taiwan Strait normally makes a U-turn north of the Zhangyun Ridge. In early 2008, the current continued straight and carried water as cold as 14 degrees C toward Penghu Island, causing damage to the local aquaculture and coral reef ecosystem. This study investigates the mechanism behind this intrusion of cold water using available data and a three-dimensional model.The model results show that the 2008 intrusion can be divided into three stages. At the beginning of February, the offshore branch of the China Coastal Current formed a U-shape in the Taiwan Strait; the branch moved cold water from the western strait to the central strait when the offshore geostrophic current, which is related to the southward sea level and density gradients, overcame the onshore Ekman transport caused by the northeasterly monsoon. In the second stage, in mid-February, strong northeasterly winds intensified the southwest current in the Taiwan Strait and resulted in abnormal transport of the cold water from the central strait to Penghu Island. Finally, at the end of February, the warm northeast current was re-established due to weakened wind, and the cold water gradually retreated to the north. The second processes occurred immediately after the first, resulting in the unique intrusion of cold water. (C) 2012 Elsevier Ltd. All rights reserved.