引用本文:
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  下载PDF阅读器  关闭
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 152次   下载 0  
分享到: 微信 更多
基于2005-2019年卫星遥感观测的南大洋印度洋扇区中部涡旋特征分布研究
李等, 程灵巧, 严晨冰, 张春玲, 胡松
上海海洋大学海洋科学学院
摘要:
在南大洋印度洋扇区中部海域,除了地形控制(凯尔盖朗高台),ACC和厄加勒斯回流的汇合流进一步加强了下游的斜压剪切强度,导致涡旋能量显著增强,因此对该海域涡旋的研究具有重要意义。文章基于2005-2019年卫星遥感数据,对该海域涡旋特征进行统计,并对涡旋产生地分布、跨锋面涡旋的移动状况进行分析,同时结合Argo剖面数据,进一步剖析涡旋内部水文分布特征。结果表明:该海域涡旋生命周期多在10天以内(75.0%),平均半径多在30-100 km之间(79.3%);平均半径与平均振幅呈正相关关系(相关系数R=0.58);生命周期越大的涡旋平均传播距离也越大。2014年开始涡旋数量明显增加,主要由短寿命涡旋(<30天)数量增加所贡献。反之,2010年代后期涡动能(EKE)异常呈减小趋势,说明增加的涡旋不具有显著EKE。涡旋产生地随着寿命增长,逐渐从亚南极锋(SAF)与南极绕极流南部边界(SBdy)之间的锋面区域向SAF以北移动。跨锋面涡旋中,暖涡(AE)向高纬,冷涡(CE)向低纬移动,大部分具有携带水团移动的能力(非线性参数U/C>1)。由涡旋内部水文分析可知,不同极性的涡旋能够实现完全不同来源水团的远距离输送,对同一来源水团则具有垂向抬升(CE)或压沉(AE)的作用。该研究工作有助于提升对南大洋涡旋特征及变动的认识,为进一步的涡旋动力研究提供支撑。
关键词:  凯尔盖朗  海洋涡旋  统计特征  跨锋面涡旋  垂直结构
DOI:10.11693/hyhz20220100005
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
Eddy characteristics in the central Indian Ocean sector of the Southern Ocean based on satellite observation from 2005 to 2019
Deng Li, Lingqiao Cheng, Chenbing Yan, Chunling Zhang, Song Hu
College of Marine Sciences,Shanghai Ocean University
Abstract:
In the central Indian Ocean sector of the Southern Ocean, besides the topographic control (Kerguelen plateau), the confluence of ACC and Agulhas Return Current further strengthens the downstream baroclinic shear, resulting in a significant increase in eddy energy. Therefore, the study on eddies in this region is of great importance. Based on the satellite data from 2005 to 2019, this paper makes statistics on the characteristics of the eddies and analyzes their generation distribution, the movement of the cross frontal eddies. In addition, combined with the Argo profile data, hydrographic properties inside the eddies are further evaluated. Results show that most of the eddy life cycles are within 10 days (75.0%), and most average radius during lifespan is between 30-100 km (79.3%); The average radius has a positive correlation with the average amplitude (correlation coefficient R = 0.58); The larger the life cycle, the larger the average propagation distance of the eddy. The number of eddies has increased significantly since 2014, which is mainly contributed by the increase in the number of short-lived eddies (< 30 days). In contrast, the eddy kinetic energy (EKE) anomaly decreases in the late 2010s, indicating that the increased eddies did not have significant EKE. The generation location of eddies gradually moves from the frontal area between SAF and SBdy to the north of SAF with the increase of life cycles. Among the cross frontal eddies, the warm eddies (AE) tend to move to higher latitudes and the cold eddies (CE) move to lower latitudes, most of which can carry water masses (nonlinear parameter U/C > 1). According to the hydrographic analysis inside the eddies, eddies with different polarities can accomplish long-distance transportation of completely different water masses, or have the effects of vertical uplift (CE) or subsidence (AE) on the same water mass. This research helps to improve the understanding of eddy characteristics and variability in the Southern Ocean and provides support for further research on eddy dynamics.
Key words:  Kerguelen  Ocean eddy  Statistical characteristics  Cross frontal eddy  Vertical structure
Copyright ©  海洋与湖沼 Oceanologia et Limnlolgia Sinica Copyright©2008 All Rights Reserved
Supervised by: 中国科协技术协会 Sponsored by: 中国海洋湖沼学会
Address: 青岛市福山路32号  Postcode: 266071  Tel: 0532-82898753  E-mail: ols@qdio.ac.cn
Technical support: Beijing E-Tiller Co.,Ltd.