2011年1月普里兹湾埃默里冰架附近水文特征  

OCEANOGRAPHIC FEATURES NEAR THE AMERY ICE SHELF IN PRYDZ BAY,ANTARCTICA,JANUARY 2011

作　　者：严金辉[1] 李锐祥[1] 侍茂崇[2] 葛人峰[3] 孙永明[2] 

机构地区：[1]国家海洋局南海工程勘察中心,广东广州510300 [2]中国海洋大学,山东青岛266003 [3]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《极地研究》2012年第2期101-109,共9页Chinese Journal of Polar Research

基　　金：中国极地科学战略研究基金项目“埃默里冰架前缘冰间湖的卫星遥感及其对陆架水的增盐效应(20100206)”;国家自然科学基金项目“艾默里冰架边缘冰间湖的成因、变化及冰-海相互作用(40676011)”;国家科技支撑计划课题“南大洋水团与环流监测技术及应用研究(2006BAB18B02)”资助

摘　　要：分析"雪龙"号2011年在普里兹湾埃默里冰架外缘一条断面上24个站位的CTD观测结果,发现有以下一些水文特征:普里兹湾西部,在71—72°E范围内,存在一个顺时针运动的中尺度涡。由于这个涡旋存在,冰架水主要扩散方向偏东,在73°30'E附近,流向东北;夏季表层水厚度,东部基本在20 m,西部受中尺度涡和其他因素的影响,夏季表层水厚度深达50 m左右;在50 m以浅的水层内,稍深处的水温比表层稍微增高,即通常称为的逆温层,它是结冰、融冰和海冰覆盖变化造成的;在观测断面西部,在160—200 m水层内,多站出现"静力不稳定":即上层密度大于下层,厚度有几米,平流混合扩散可能是这一不稳定现象主要原因。Conductivity, temperature and depth （CTD） data were collected by the R/V Xue Long icebreaker at 24 sites north of the Amery Ice Shelf. The data showed that in west Prydz Bay, between 71--72°E, there is a clockwise mesoscale eddy, which leads to deeper, colder water, with higher salinity and increased density. As a result of the eddy, the ice shelf water moves eastward and turns to the northeast near 73°30＇E. In summer, the thickness of the surface water is about 20 m in the eastern section and about 50 m in the western section, influenced by the me- soscale eddy. Within the water layer less than 50 m, water temperature is slightly higher in the lower layer than at the surface. This is termed a temperature inversion layer. In the western section, there is a density-related ＇static instability＇ phenomenon at depths of about 160--200 in, with layer thicknesses of less than 10 m at many sites. Mixing by advection and diffusion may be the main reason for this instability phenomenon.

关 键 词：普里兹湾 埃默里冰架 水文特征 中尺度涡 

分 类 号：P343.6[天文地球—水文科学]