摘要
普里兹湾陆架水能否下沉到800m甚至更深而与上升的绕极深层水相混合并形成南极底层水，迄今仍是一个悬而未决的问题。利用1989－1990和1990－1991南极夏季在普里兹湾邻近海区“极地号”考察获得的温盐资料和有关的化学要素资料，通过对考察区热盐结构和水团分布特性的分析，发现高温、高盐的绕极深层水在某些情况下有可能扩展到普里兹湾陆架上。在观测期间的普里兹湾陆架上几乎不存在低盐陆架水，而观测到的仅是高盐陆架水；由于这种高盐陆架水的盐度在某些测站处已达到34.65×10－3（σt=27．90），因此，这种较重的水已有可能沿着大陆坡下滑而达到800m甚至更深而与上升的绕极深层水相混合。
Hydrographicai and chemical data acquired by the Chinese Anarctic R/V'Jidi' in the Sixth (1989- 1990) and Seventh (1990- 1991) Cruises of the ChineseNational Antarctic Research Expedition in austral summer in the region of Prydz Bayare used to analyze the thermohaline structure and the water mass distribulion there.The main results from this study were as follows.(1) In some cases the CircumpolarDeep Water (CDW) could possibly intrude onto the continental shelf break off PrydzBay; (2) In austral summer in the Prydz Bay region there were two thermoclines inmost of the measured stations and two haloclines in som measured stations, whoselocations and properties quite different from what were shown by Smith et al. (1984),and had some marked interannual variations in the thermohaline structure of the sur-face water; (3) A high salinity and density shelf water mass (SW) existed in theunique continental shelf water in the region during the cruises, where salinity couldreach 34.65×10-3 (σt=27.90) in some stations, a possibility for the high salinity SWto go down the continelltal slope.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1996年第3期229-236,共8页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金!49376260
国家八五攻关资助!905-02-01
关键词
热盐结构
普里兹湾区
水团
Thermohaline structure Sinking of high-salinity continental shelf water Prydz Bay
