| 引用本文: | 李等,程灵巧,严晨冰,张春玲,胡松.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.海洋与湖沼,2022,53(5):1054-1066. |
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| 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 |
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李等1, 程灵巧1,2,3, 严晨冰1, 张春玲1,2,3, 胡松1,2,3
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1.上海海洋大学海洋科学学院 上海 201306;2.上海海洋大学海洋科学与技术实验教学示范中心 上海 201306;3.自然资源部海洋生态监测与修复技术重点实验室 上海 201306
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| 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),南极绕极流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有助于了解该海域的涡旋特征以及地形与涡旋的分布关系。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20 d以内(64.25%),平均半径多在30~100 km(96.13%);平均半径与平均振幅呈正相关关系(相关系数R=0.55);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 d)数量增加所贡献。反之, 21世纪10年代后期年平均涡动能异常呈减小趋势。涡旋产生地随着寿命增长,逐渐从亚南极锋与南极绕极流南部边界之间的锋面区域向亚南极锋以北移动。跨锋面涡旋中,暖涡向高纬,冷涡向低纬移动,大部分具有携带水团移动的能力。由涡旋内部水文特征分析结果可知,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,气旋涡具有抬升作用,而反气旋涡具有压沉作用。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:P728.1;P731.1 |
| 基金项目:国家自然科学基金,42176012号,42130402号;国家重点研发计划子课题,2021YFC3101702号。 |
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| CHARACTERISTICS OF EDDIES IN THE CENTRAL INDIAN SECTOR OF THE SOUTHERN OCEAN BASED ON SATELLITE OBSERVATION FROM 2005 TO 2019 |
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LI Deng1, CHENG Ling-Qiao1,2,3, YAN Chen-Bing1, ZHANG Chun-Ling1,2,3, HU Song1,2,3
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1.College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;2.Demonstration Center for Experimental Teaching of Marine Science and Technology, Shanghai Ocean University, Shanghai 201306;3.Key Laboratory of Marine Ecological Monitoring and Restoration Technologies, MNR, Shanghai 201306, China
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| Abstract: |
| In the central Indian Ocean sector of the Southern Ocean beside the topographic control (Kerguelen plateau),the confluence of Antarctic Circumpolar Current (ACC) and Agulhas Return Current strengthens the downstream baroclinic shear,resulting in a significant increase in eddy energy.Therefore,the study on eddies in this region is helpful to understand the eddies characteristics and the distribution relationship between topography and eddies in this region.Based on the satellite data from 2005 to 2019,a statistic study on the characteristics of the eddies was conducted and their generation distribution and the movement of the cross frontal eddies were analyzed.In addition,combined with the Argo profile data,hydrographic properties inside eddies were further evaluated.Results show that most of the eddy life cycles are within 20 days (64.25%),and most average radius during lifespan is between 30~100 km (96.13%).The average radius has a positive correlation with the average amplitude (correlation coefficient R=0.55).Eddies with larger life cycle have longer average propagation distance.The number of eddies increased significantly since 2014 due mainly to the increase in the number of short-lived eddies (<30 days).In contrast,the eddy kinetic energy (EKE) anomaly decreased in the late 2010s.The generation location of eddies gradually moved from the frontal area between the Subantarctic Front (SAF) and Southern Boundary of the ACC to the north of SAF with the increase of life cycles.Among the cross frontal eddies,the warm eddies tended to move to higher latitudes while the cold eddies moved to lower latitudes,most of which can carry water masses.According to the analysis results of hydrographic characteristics inside eddies,eddies with different polarities could accomplish long-distance transportation of completely different water masses.For water masses from the same source,cyclonic eddies have a vertical uplift effect,while the anticyclonic ones have a subsidence effect.This research helps to improve the understanding of eddy characteristics and variability in the Southern Ocean and supports the further research on eddy dynamics. |
| Key words: Kerguelen ocean eddy statistical characteristics cross frontal eddy vertical structure |
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