2013年夏季普里兹湾水团分析

Analysis of Water Masses in Prydz Bay of Antarctica in the Summer of 2013

为了解南大洋水团的分布特征并进一步为渔业生产提供信息参考,本文采用雪龙号第29次南极考察CTD数据,通过定性综合分析法、浓度混合分析法以及聚类分析法对2013年夏季普里兹湾水团进行了分析。研究结果表明,2013年夏季普里兹湾共存在6个水团,分别为夏季表层水、冬季陆架混合水、夏季冬季混合水、冰架水、绕极深层水和南极底层水。其中夏季表层水位于普里兹湾东北海域,只占薄薄的一层;冰架水向北可延伸至66°48′S;绕极深层水以及南极底层水在大陆坡处都存在显著的爬升,水体的爬升带动营养盐上升,在水深200～600m处与其他水团扰动混合,容易形成渔场。

In order to investigate the distribution of water masses in the southern ocean and to provide information for fisheries,three methods（qualitative analysis,concentration analysis and clustering method）were used to analyze water masses in Prydz Bay based on the data of the 29 th Antarctic Chinese Scientific Expedition.The results showed that the water system could be divided into six water masses in Prydz Bay,which were the Summer Surface Water,the Winter-Shelf Mixed Water,the Summer-Winter Mixed Water,the Ice Shelf Water,the Circumpolar Deep Water and the Antarctic Bottom Water.The Summer Surface Water only took up a thin layer in the north-east area of Prydz Bay.The Ice Shelf Water could extend to66.8°S.And there were upwellings in the Circumpolar Deep Water and the Antarctic Bottom Water,which took nutrients up to 100~600 m deep where water stirred.These upwellings are helpful for the forming of fishing grounds.