南极普里兹湾及其邻近海域的水文结构特征和底层水的来源

Characteristics of hydrographic structure and source of bottom water in the Prydz Bay and vicinity sea area

利用中国第九次南大洋考察中南极普里兹湾及其邻近海域的ＣＴＤ资料，分析研究了调查海域的水文结构特征及其该区南极底层水（ＡＡＢＷ）的来源．研究结果表明，在研究海域，深水洋区近表层流由西向东流，而在普里兹湾内存在一个气旋型涡．水文结构中最明显的海洋学特征是：（１）绕极深层水（ＣＤＷ）的涌升现象明显，涌升最强的位置是麦克罗伯逊地以北海域，最明显的深度是５０～２００ｍ层，暖水涌升将冬季冷水分隔成南北两部分，并在其中形成孤立的暖水块；（２）陆缘水边界明显，这是绕极深层水与南极冷水之间形成的锋面，一般处在次表层水中，大致位于６４°～６６°Ｓ之间；（３）存在着双跃层结构．观测期间，普里兹湾以北探水海域存在着南极底层水，其来源可能有二：一为当地形成，二为源于威德尔海和罗斯海．

Based on the data of CTD in the Prydz Bay and the vicinity sea area by CHINARE-9, hydro- graphic structure and the source of Antarctic Bottom Water(AABW) is analysed in the paper. Results show that, near-surface current flows from west to east in the deep waters. there is a cyclonic eddy in the Prydz Bay. The main characteristics of oceanography hydrographic structure are that: (1) the upwelling phenomenon of Circumpolar Deep Water(CDW). The strongest location of upwelling is sea area north of Mcrobsion Land. The most obvious depth is in 50～200m. The cold water in winter is divided in two parts by the CDW of up- welling. An isolated warm water is formed among them. (2) Boundary of continental margin water is obvious. This is the front between CDW and Antarctic cold water of subsurface. it is in 64°～ 66°S.(3) There is double thermocline structure.(4) During observation there is AABW north of the Prydz l3ay.The source of AABW may have two :(l) it is formed in the locality,(2) it comes from the Ross Sea.