| Cui Wei,Wang Wei,Zhang Jie,Yang Jungang. 2020. Identification and census statistics of multicore eddies based on sea surface height data in global oceans. Acta Oceanologica Sinica, 39(1):41－51 |
| Identification and census statistics of multicore eddies based on sea surface height data in global oceans |
| 基于海面高度数据的全球海洋多核涡旋探测和统计 |
| Received:July 28, 2018 |
| DOI：10.1007/s13131-019-1519-y |
| Key words:satellite altimetry mesoscale eddy multicore structure eddy identification eddy characteristic |
| 中文关键词: 卫星高度计 中尺度涡 多核结构 涡旋识别 涡旋属性 |
| 基金项目:The National Key Reasearch and Development Program of China under contract No. 2016YFC1401800; the National Natural Science Foundation of China under contract No. 41576176; the National Programme on Global Change and Air-Sea Interaction; Dragon 4 Project under contract No. 32292. |
| Author Name | Affiliation | E-mail | | Cui Wei | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Physical Oceanography Lab, Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao 266100, China | | | Wang Wei | Physical Oceanography Lab, Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao 266100, China | | | Zhang Jie | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Yang Jungang | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | yangjg@fio.org.cn |
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| Abstract: |
| This study produced a statistical analysis of multicore eddy structures based on 23 years' altimetry data in global oceans. Multicore structures were identified using a threshold-free closed-contour algorithm of sea surface height, which was improved for this study in respect of certain technical details. Meanwhile a more accurate definition of eddy boundary was used to estimate eddy scale. Generally, multicore structures, which have two or more closed eddies of the same polarity within their boundaries, represent an important transitional stage in their lives during which the component eddies might experience splitting or merging. In comparison with global eddies, the lifetimes and propagation distances of multicore eddies were found to be much smaller because of their inherent structural instability. However, at the same latitude, the spatial scale of multicore eddies was found larger than that of single-core eddies, i.e., the eddy area could be at least twice as large. Multicore eddies were found to exhibit some features similar to global eddies. For example, multicore eddies tend to occur in the Antarctic Circumpolar Current, some western boundary currents, and mid-latitude regions around 25°N/S, the majority (70%) of eddies propagate westward while only 30% propagate eastward, and large-amplitude eddies are restricted mainly to reasonably confined regions of highly unstable currents. |
| 中文摘要: |
| 该研究基于23年的全球海洋高度计产品数据，对多核涡旋结构进行了统计分析。使用海面高度闭合等值线算法识别多核结构，该算法针对涡旋识别的某些细节进行了改进。同时，使用更准确的涡旋边界定义来估计中尺度涡的尺度。通常，多核结构是在其边界内具有两个或多个相同极性的闭合涡旋。这种多核结构代表涡旋生命中的某个过渡阶段，在此期间多核涡旋可能发生分裂或融合。与全球中尺度涡相比，多核涡旋由于其自身的结构不稳定性，它的生命周期和传播距离要小得多。然而，在相同的纬度多核涡旋的空间尺度大于单核涡旋的空间尺度，比如就面积而言多核涡旋会比单核涡旋大两倍多。研究发现多核涡旋也具有一些类似于全球中尺度涡的特征。例如，多核涡旋往往发生在南极绕极流、一些西边界流以及25°N/S附近的中纬度地区；大部分多核涡旋（70%）也是向西传播，而仅30%向东传播；并且大振幅涡旋主要分布在高度不稳定流区域。 |
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