南极普里兹湾附近73°E断面水文结构及多年变化  

Variation of Hydrographic Features Along 73°E Section near Prydz Bay

作　　者：高郭平[1] 董兆乾[2] 侍茂崇[1] 

机构地区：[1]中国海洋大学,青岛266003 [2]中国极地研究中心,上海200129

出　　处：《青岛海洋大学学报（自然科学版）》2003年第4期493-502,共10页Journal of Ocean University of Qingdao

基　　金：国家自然科学基金项目 (4 0 0 0 6 0 0 2 );国家自然科学基金重点项目 (4 9836 0 10);国家"十五"社会公益研究专项基金项目 (2 0 0 1DIA5 0 0 4 0 )资助

摘　　要：根据 2 0 0 2 ,2 0 0 0和 1999年中国南极考察和 1992年澳大利亚南极考察资料 ,分析了普里兹湾 73°E断面水团与地转流的结构及其多年变化 :(1)该断面上水团主要有南极表层水、绕极深层水、南极底层水和陆架水 ;(2 )南极表层水 1999,2 0 0 0年向北扩展最强 ,2 0 0 2年向北扩展最弱 ,绕极深层水 2 0 0 2年向南扩展也较强 ,1999和 1992年绕极深层水向南扩展较弱 ,南极底层水 ,位温在 - 0 .3～- 0 .4℃ ,盐度在 34.6 6左右 ,主要是本地形成 ,而 1992年高盐底层水可能来源于其他原因 ;(3)该海域深层水呈显著的升温 ,增暖率约为 0 .0 0 7～ 0 .0 0 8℃ /a;(4 )南极陆坡锋的强度和位置 ,与南极表层水的北向扩展和绕极深层水的变化一致 ;(5 ) 6 2°S～ 6 6°S是绕极流的南缘 ,东向流深度可达 2 0 0 0 m,最大流速中心在 6 4.5°S附近 ,2 0 0 0年北移至 6 3.5°S附近 ,最大流速为 3～ 5 cm/s;陆架上 6 8°S附近主要为流速 1cm /s左右的西向流。The Hydrographic data from three major CHINARE cruises and one Australian cruise along 73°E near Prydz Bay are interpreted to present the features and variations of water masses and geostrophic currents. In 1999 and 2000, the northward extending of the AASW was stronger than in other years and was the weakest in 2002. Two types of bottom water are identified: the lower salinity water observed in 1999 and 2000 was formed locally and the higher salinity bottom water observed in 1992 was formed from other sources. The warming of deep water occurred at a rate of 0.007～ 0.008℃yr -1. The position and strength of the ASF changed year after year close to the variation of the northward extending of the AASW and the upwelling of the CDW. Between 62°S and 66°S, The maximum speed of the eastward current was about 3～5cm/s in the vicinity of 64.5°S, but in 2000 it shifted northward by about one degree. The speed of westward current was about 1cm/s near 68°S.

关 键 词：南极普里兹湾 水团 深层水增暖 陆坡锋 地转流 多年变化 水文结构 断面 

分 类 号：P731[天文地球—海洋科学] P728.2