普里兹湾及邻近海域多航次水文特征比较分析  

A Comparative Analysis on Hydrographic Features During Several Cruises in the Region of Prydz Bay,Antarctic

作　　者：林丽娜[1,2,3] 陈红霞[3] 刘娜[3] 

机构地区：[1]中国科学院南海海洋研究所,广东广州510301 [2]中国科学院大学,北京100049 [3]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《海洋科学进展》2015年第4期460-470,共11页Advances in Marine Science

基　　金：国家重点基础研究发展计划--南大洋海-冰-气相互作用及其对南印度洋的影响(2010CB950301);国家高技术研究发展计划项目--冰架热水钻关键技术与系统研发(2011AA090401);海洋公益性行业科研专项--极地海洋环境监测网系统研发及应用示范(201305035);南北极环境综合考察与评估专项--2014年度南极周边海域物理海洋和海洋气象专项(CHINARE2014-01-01);2014年度南极综合环境分析与评价(CHINARE2014-04-01)

摘　　要：利用第15，16，21，25，26和27次南极考察在普里兹湾及邻近海域所获取的CTD观测数据，对该海域主要水团、典型层面水文要素平面分布等进行了对比分析。研究表明：1）普里兹湾及邻近海域水团主要包括南极表层水、普里兹湾陆架水、绕极深层水和南极底层水。夏季表层水温盐变化显著，没有固定的核心值；绕极深层暖水的分布范围和温盐特征相对比较稳定；南极底层水在各航次中均有出现。2）在陆架水中存在位温低于海面冰点的冰架水和温度低于现场温度的过冷水。冰架水主要分布在冰架前缘和70°30′E断面上，沿70°30′E断面最北可扩展至陆坡附近；过冷水主要分布在冰架前缘西部。3）高盐陆架水在普里兹湾存在较少，主要分布在埃默里冰架前缘和73°E断面67°30′～68°45′S范围内，其中S〉34．62的高盐陆架水均位于73°E断面附近，并沿73°E断面向北扩展至67°30′S附近，盐度最大值为34．64。4）夏季表层温盐分布时空变化特征显著。部分航次埃默里冰架前缘存在一个很强的纬向温度锋面，最高温度达到3．55℃。5）绕极深层水在第15航次涌升至100m以浅，涌升最明显的海域在63°00′～64°00′s附近，73°E断面涌升最强。CTD data obtained in six CHINARE cruises （15,16,21,25,26,27） are selected from all previous CHINARE cruises so far in the Prydz Bay and its adjacent region. The data are used to analyze the major water masses and the spatial distribution of temperature and salinity at the typical level. The water masses in the Prydz Bay and its adjacent region include Antarctic Surface Water （AASW）, Shelf Water （SW）, Circumpolar Deep Water （CDW） and Antarctic Bottom Water （AABW）. AASW is characterized by salinity and temperature ranging widely, while the distribution and characteristic of CDW are much more stable. What＇s more, AABW exits in all the cruises. There are two water masses existing in the SW, which are Ice Shelf Water （ISW） with potential temperature lower than freezing temperature under one atmospheric pressure and Supercooled water with temperatures below freezing point. ISW is located in the front of Amery Ice Shelf and 70°30′E section. ISW could spread north to the continental break along 70°30′E. Supercooled water occurs in the region west of the Amery Ice Shelf front. High Salinity Shelf Water （HSSW） is located in the front of Amery Ice Shelf and 67°30′-68°45′S along 73°E section. HSSW higher than 34.62 is located near 73°E section and could spread north to 67°30′S. Surface layer of ocean in summer has obvious temporal and spatial variations. There is a strongly temperature front in the Amery Ice Shelf front, whose max value is 3.55 ℃. CDW upwells to shallower than 100 m in the studied area of 63°00′ to 64°00′S latitude. It is in the 73°E section that the upwelling of CDW is the strongest.

关 键 词：水团 冰架水 高盐陆架水 绕极深层水 

分 类 号：P728.2[天文地球—海洋科学] P731