东南印度洋海域冬季水文特征及其水团分析

为了研究东南印度洋海域冬季水文特征及其水团结构,利用澳大利亚海洋与南极研究所2012-2013年南半球冬季在东南印度洋观测得到的温度、盐度和溶解氧的资料进行分析。结果表明:表层温度呈现明显的北高南低态势,次表层均存在较强的温度、盐度、密度跃层,且均呈现出高/低盐带与高/低溶解氧带,高盐带在经向断面上最为明显;在105°E断面上存在显著的中尺度现象,且呈现上下层暖、冷涡叠置的分布特征,根据温度、盐度及溶解氧的特性,除南印度洋中央水和南极中层水外,分别将研究海域其他水团命名为副热带东南印度洋表层水、副热带东南印度洋次表层水、副热带东南印度洋模态水、副热带东南印度洋中层水、副热带东南印度洋深层水和副热带东南印度洋底层水,并给出各自的特性指标。

Hydrographic features and water masses of southeast Indian Ocean region

To study the hydrographic features and water masses in the Southeast Indian Ocean, the temperature, salinity and dissolved oxygen profiles obtained by the Institute for Marine and Antarctic (IMAS) in the Southern hemisphere Winter of 2013 were used to analyse the distribution characteristics. The results show that the surface temperature is significantly high in the north and low in the south. There are strong thermocline, halocline and pycnocline in the subsurface, and high/low salinity zone and high/low dissolved oxygen zone, and the high salinity zone is obvious on the longitude sections. There are significant mesoscale eddies on the 105°E section, and the cold and warm eddies are spatially overlaid on the section. In addition to the southern Indian Ocean central water, according to the characteristic of temperature,salinity and dissolved oxygen,other water masses are named subtropical southeast Indian Ocean surface water, subtropical southeast Indian Ocean subsurface water, subtropical southeast Indian Ocean modal water, subtropical southeast Indian Ocean water, middle subtropical southeast Indian Ocean deep water and subtropical southeast Indian Ocean bottom water, with their characteristic parameters given respectively.