基于Argo资料的热带印度洋上层声场分析  

Analysis of acoustic field in tropical Indian Ocean upper based on Argo data

作　　者：韩玉康[1] 周林[1] 

机构地区：[1]解放军理工大学气象海洋学院,江苏南京211101

出　　处：《解放军理工大学学报（自然科学版）》2015年第2期180-187,共8页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41306010)

摘　　要：为了解热带印度洋的水声场,利用2004-2013年10a的地转海洋学实时观测阵(Argo)资料,根据声速计算经验公式,对水声的水平分布、铅直断面分布、声跃层的分布、季节变化和铅直结构进行了较为全面的分析,并对强跃层区进行逐月研究。结果表明,50m深度层声速场呈北高南低的纬向带状分布形式,而200m深度层声速场由北向南呈现高—低—高—低分布;在85°E断面上,声速等值线在赤道以南存在较大的槽、脊,而在赤道以北较为平直;声跃层的深度冬季总体分布为南浅北深,夏季在10°N西印度洋和10°S东印度洋各有一部分明显的较深区域;跃层厚度普遍冬季大于夏季,东部大于西部,跃层强度的分布在冬季存在1个高值区,在夏季存在2个高值区;跃层的断面分布上,其结构、强度和位置都随季节有明显变化。For an in-depth knowledge of the underwater acoustic field in the tropical Indian Ocean, a rela- tively comprehensive research and analysis is made, including the horizontal distribution and vertical cross- section distribution of underwater sound, the distribution of acoustic spring layer, the seasonal variation and the vertical structure by the use of the Argo （Array for Real-time Geostrophic Oceanography）data from 2004 to 2013 and in accordance with the empirical formula offered by Chen and Millero for sound ve- locity calculation. In addition, the strong spring layer was researched month by month. The result shows that the 50-meter-deep acoustic velocity field distributs in annuluses broadwise, high in the north and low in the south, while the 200-meter-deep acoustic velocity field distributes in the form of upland-bottomland- upland-bottomland from north to south. On the fracture surface at 85°E, there are larger trough and ridge for acoustic velocity isogram to the south of the equator while there is flat and straight land to the north; and acoustic spring layer generally distributes shallowly in south and deeply in north in winter. There are some visible deep regions in the Western Indian Ocean at 10°N and the Eastern Indian Ocean at 10°S. The thickness of spring layer is usually larger in winter than in summer and larger in the east than in the west, and there is a high value area for the distribution of the layer intensity in winter and two high value areas in summer. About the cross-section distribution of the layer, its structure, intensity and position change sig- nificantly from season to season.

关 键 词：地转海洋学实时观测阵 热带印度洋 声场 

分 类 号：P733.21[天文地球—物理海洋学]