论文部分内容阅读
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。
Whether the Prydz Bay shelf water can sink to 800 m or even deeper and mix with the rising deep water and form the Antarctic bottom water remains a pending issue. Based on the data of temperature and salinity obtained from the study of the “Pole” in the adjacent sea area of Prydz Bay during the summer of 1989-1990 and 1990-1991 in Antarctica, and the relevant chemical elements, the analysis of thermal salt structure and water mass distribution in the study area revealed that High temperature, high salt orbiting deep water may in some cases extend to Prydz Bay shelf. Low-salt shelf waters are scarcely present on the Prydz Bay shelf during the observation period, whereas only high-salt shelf waters are observed; as the salinity of this high-salt shelf water has reached 34.65 × 10 at some stations -3 (σt = 27.90). As a result, it is possible that this heavier water slipped along the continental slope to a depth of 800 m or more, mixing with the rising deep-bedded water.