南印度洋中尺度涡统计特征及三维合成结构研究

发布时间：2018-01-11 08:13

本文关键词：南印度洋中尺度涡统计特征及三维合成结构研究　出处：《海洋学报》2017年09期 　论文类型：期刊论文

【摘要】：南印度洋是海洋中尺度涡的多发区域。本文利用卫星高度计资料及Argo浮标资料,对南印度洋(10°~35°S,50°~120°E)区域中尺度涡的分布、表观特征等进行了统计分析,采用合成方法,构建了该区域中尺度涡的三维温盐结构。结果表明,涡旋频率呈明显的纬向带状分布,在18°~30°S存在一个明显的涡旋频率带状高值区;涡旋半径具有由南至北逐渐增大的趋势;长周期涡旋在其生命周期内,半径、涡动能、涡能量密度、涡度等性质均经历了先增大而后减小的过程;涡旋以西向运动为主,在经向上移动距离较小,长周期气旋(反气旋)涡具有明显的偏向极地(赤道)移动的倾向;涡旋平均移动速度为5.9cm/s,速度大小大致沿纬向呈带状分布。在混合层以下,气旋涡(反气旋涡)内部分别呈现明显的温度负(正)异常,且分别存在两个位温负(正)异常的冷(暖)核结构;气旋涡(反气旋涡)整体上呈现"正—负"("负—正")上下层相反的盐度异常结构。中尺度涡对温盐的平均影响深度可达1 000×104 Pa以上。
[Abstract]:South India ocean is the ocean mesoscale eddies in multiple regions. Using satellite altimeter data and Argo buoy data, the South India ocean (10 degrees ~35 degrees S, 50 degrees ~120 degrees E) distribution of regional mesoscale eddies, apparent characteristics was analyzed by the method of synthesis, constructs a three-dimensional temperature salt structure of the region scale. The results show that the vortex frequency showed obvious latitudinal distribution at 18 DEG ~30 DEG S, there is an obvious vortex frequency band of high value area; with vortex radius increases gradually from the south to the north of the trend; long period of vortex in its life cycle, the radius. Eddy kinetic energy, eddy energy density, vorticity properties have experienced increased first and then decreased in the process of vortex motion; to the west, in the moving distance is small, long period cyclonic (anticyclonic) polar vortex has obvious bias (equator) moving tendency; vortex moving average speed is 5.9cm/s, The velocity along the latitudinal zonal distribution. In the mixed layer, the cyclonic eddy (anticyclonic) respectively showed significant negative temperature anomalies (positive), and there were two potential temperature negative (positive) abnormal cold (warm) nuclear structure; the cyclonic eddy (anticyclonic) on the "positive negative" ("negative positive") on the opposite lower salinity anomaly structure. Mesoscale eddy effects on average temperature and salinity depth can reach 1000 * 104 Pa or more.

【作者单位】：解放军31010部队;国防科技大学气象海洋学院;解放军92689部队;
【基金】：国家自然科学基金(11102232) 江苏省自然科学基金(BK20150711)
【分类号】：P731.2
【正文快照】： 湛江524000)1引言海洋中尺度涡是全球大洋中普遍存在的一种中尺度现象,它往往携带很大的动能,能量比平均流的能量要大一个量级以上[1]。中尺度涡在海洋温盐和能量传输、海洋混合等方面起着重要作用[2-5],对局地和大尺度环流也有重要影响[6-7]。近年来,综合利用卫星遥感资料、

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