| 基于高度计观测和模式数据诊断南大洋主要锋面与涡旋的特征 |
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| 引用本文： | 周润洁,王天宇,杜岩.基于高度计观测和模式数据诊断南大洋主要锋面与涡旋的特征[J].海洋科学,2022,46(2):1-16. |
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| 作者姓名： | 周润洁 王天宇 杜岩 |
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| 作者单位： | 热带海洋环境国家重点实验室 中国科学院南海海洋研究所, 广东 广州 510301;中国科学院大学, 北京 100049,热带海洋环境国家重点实验室 中国科学院南海海洋研究所, 广东 广州 510301,热带海洋环境国家重点实验室 中国科学院南海海洋研究所, 广东 广州 510301;中国科学院大学, 北京 100049;南方海洋科学与工程广东省实验室, 广东 广州 511458 |
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| 基金项目： | 科技部重点研发项目(2018YFA0605700)；;国家自然科学基金(42106022)； |
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| 摘 要： | 锋面和涡旋是南大洋重要的中尺度过程,南极绕极环流(Antarctic Circumpolar Current,ACC)系统中的锋面及其裹携的涡旋构成了能量和物质的东向传播通道,对全球大洋的能量和物质平衡具有重要影响。基于海表高度计和B-SOSE(Biogeochemical Southern Ocean State Estimate,B-SOSE)数据,文中分别对南大洋3条主要锋面2013—2017年的分布特征以及近25 a(1993—2018年)涡旋特征进行了统计分析,结果表明:受背景流场的影响,三条主要锋面的纬度位置均会随时间发生变化,其中亚南极锋(Subantarctic Front,SAF)纬度摆动幅度最大,5年内最大摆幅为18°。就锋面强度而言,极锋(Polar Front,PF)强度最大,其能达到的平均深度显著大于其他锋面的影响深度。同时,还统计了1993—2018年间南大洋60 717个涡旋,这些涡旋平均存活时间、平均传播距离和平均半径均明显小于全球涡旋平均值,其中被ACC裹携的36 934个东移涡旋(占南大洋涡旋总数的61%)的时间和空间特征尺度则更小。
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| 关 键 词： | 南大洋 锋面 涡旋 统计特征 |
| 收稿时间： | 2021/2/4 0:00:00 |
| 修稿时间： | 2021/4/12 0:00:00 |
Statistical characteristics of major fronts and eddies in the Southern Ocean based on altimetry observations and a model dataset |
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| ZHOU Run-jie,WANG Tian-yu,DU Yan.Statistical characteristics of major fronts and eddies in the Southern Ocean based on altimetry observations and a model dataset[J].Marine Sciences,2022,46(2):1-16. |
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| Authors: | ZHOU Run-jie WANG Tian-yu DU Yan |
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| Institution: | South China Sea Institute of Oceanology, Chinese Academy of Sciences,South China Sea Institute of Oceanology, Chinese Academy of Sciences,South China Sea Institute of Oceanology, Chinese Academy of Sciences |
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| Abstract: | Fronts and their entrapped eddies are important mesoscale processes in Antarctic Circumpolar Current (ACC) systems. They constitute the eastward pathway of energy and mass fluxes in the Southern Ocean, contributing to global energetic and material balance. In this study, we analyzed the characteristics of Southern Ocean fronts in 2013-2017 and eddies in the recent 25 years (in 1993-2018) based on altimeter data and B-SOSE data. Our results display that the front-location latitudes are varied with the influences from the background flows. Among the major fronts, the Subantarctic Front (SAF) has the largest swing, with a range of 18° within 5 years. As for frontal velocity strength, the Polar Front (PF) is strongest. The average depth that PF can extend is significantly deeper than other fronts. The statistics for eddies are based on 60 717 eddies identified in the Southern Ocean from 1993 to 2018. The average statistical values of these eddies are significantly smaller than global eddies, for example, lifetime, distance, and radius. Especially, there are 36 934 eastward eddies (counted for 61% of the total Southern Ocean eddies) counted in ACC, which are smaller in both space- and time- scale. |
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| Keywords: | Southern Ocean front mesoscale eddy statistical characteristic |
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