海洋次表层SCVs的特征与成因机制:问题与进展

Characteristics and mechanism of ocean subsurface coherent eddies:Problems and progress

随着观测技术的进步和海洋数值模拟能力的提升,已发现在海洋次表层中广泛存在一种远离生成源区、结构紧致且稳定的次表层强化的SCVs,其动力学特征表现为:弱层结,低位涡中心,外围等密度线呈透镜状结构,温度、盐度或其他示踪量的性质与周围水体相比存在明显异常,内部核心流速较强。此类次表层SCVs对于海洋的水体运输、热盐环流和海洋生物生态环境均有重要影响。该文通过综述海洋次表层SCVs的结构及水文特征、识别方法、次表层SCVs在全球的分布、动力学机制及其重要影响等,展现次表层SCVs的研究进展,提出了未来研究的方向,包括研究的难点和全面认识海洋次表层SCVs尚待解决的问题。

With the advancement of observation technology and the improvement of ocean numerical simulation capabilities,some stable subsurface coherent vortices have been widely observed in the ocean,which far from the formation source area.These vortices possess distinctive dynamic characteristics,such as a low potential vorticity center,lens-like structure of isopycnals,weak stratification,and anomalous temperature,salinity,or other tracer properties compared to the surrounding water mass.Their core flow is relatively stronger.These subsurface coherent vortices significantly impact ocean water mass transport,thermohaline circulation and marine biological environment.This paper comprehensively summarizes researches on subsurface coherent vortices in the ocean,including their structure,hydrological characteristics,identifying methods,global distribution,dynamic mechanisms and their important effects on ocean environment.Furthermore,the research perspectives are discussed,such as the difficulties in the research and the issues that need to be solved to comprehensively understand subsurface coherent vortices in the ocean.