Mean properties of mesoscale eddies in the Kuroshio recirculation region
文献类型：CNKI期刊论文
| 作者 | Ma LB(马利斌); Wang Q(王强) |
| 发表日期 | 2014-05-15 |
| 出处 | Chinese Journal of Oceanology and Limnology
 |
| 关键词 | mesoscale eddies spatial distributions temporal variations potential factors |
| 英文摘要 | Using a 19-year altimetric dataset, the mean properties and spatiotemporal variations of eddies in the Kuroshio recirculation region are examined. A total of 2 001 cyclonic tracks and 1 847 anticyclonic tracks were identifi ed using a geometry-based eddy detection method. The mean radius was 57 km for cyclonic eddies and was 61 km for anticyclonic eddies, respectively, and the mean lifetime was about 10 weeks for both type eddies. There were asymmetric spatial distributions for eddy generation and eddy termination, which were domain-dependent. Mean eddy generation rates were 2.0 per week for cyclonic eddies and were 1.9 per week for anticyclonic eddies. Both type eddies tended to deform during their lifetime and had different propagation characteristics, which mainly propagated westward and southwestward with velocities 4.0–9.9 cm/s, in the Kuroshio recirculation region. Further discussion illustrates that the eddy westward speed maybe infl uenced by the combined effect of vertical shear of horizontal currents and nonlinearity of eddy. To better understand the evolution of eddy tracks, a total of 134 long-lived tracks(lifetime ≥20 weeks) were examined. Comparison between short-span eddies(lifetime ≥4 weeks and <20 weeks) and long-lived eddies is also conducted and the result shows that the short-span and long-lived eddies have similar time evolution. Finally, eddy seasonal variations and interannual changes are discussed. Correlation analysis shows that eddy activity is sensitive to the wind stress curl and meridional gradient of sea surface temperature on interannual timescales. Besides, the strength and orientation of background fl ows also have impacts on the eddy genesis. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the National Natural Science Foundation of China(No.41230420) ; the Knowledge Innovation Program of Chinese Academy of Sciences(No.KZCX3-EW-201) ; the Basic Research Program of Science and Technology Projects of Qingdao(No.11-14-95-jch) |
| 卷 | v.32期:03页:193-214 |
| 语种 | 英文; |
| 分类号 | P731.27 |
| ISSN号 | 0254-4059 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/190457]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.KeyLaboratoryofOceanCirculationandWaves,InstituteofOceanology,ChineseAcademyofSciences 2.UniversityofChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Ma LB,Wang Q. Mean properties of mesoscale eddies in the Kuroshio recirculation region. 2014. |
入库方式： OAI收割
来源：海洋研究所
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