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2011年1月普里兹湾埃默里冰架附近水文特征

【标题】2011年1月普里兹湾埃默里冰架附近水文特征

【Title】The Oceanographic features near Amery Ice Shelf of the Prydz Bay in January 2011

【DOI】10.3724 /SP.J.1084.2012.00101

【作者】 严金辉; 李锐祥; 侍茂崇; 葛人峰; 孙永明

【Author】 Yan Jinhui ; Li Ruixiang ; Shi Maochong ; Ge Renfeng ; Sun Yongming

【期刊】极地研究

【Journal】

【期刊年份】2012

【卷】24

【期】2

【关键词】 普里兹湾; 埃默里冰架; 水文特征; 中尺度涡

【Keywords】 Prydz Bay; Amery Ice Shelf; Hydrological features; Mesoscale eddy

【摘要】分析“雪龙”号2011年在普里兹湾埃默里冰架外缘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°E-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20m,西部受中尺度涡和其他因素的影响,夏季表层水厚度深达50m左右;在50m以浅的水层内,表面以下温度会出现稍微增大现象,我们称之为逆温层,它是结冰、融冰和海冰覆盖变化造成的;在观测断面西部,在160m~200m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。

【Abstract】Based on the CTD observational data from 24 stations of a section over the north edge of the Amery Ice Shelf during the 27th Chinese National Antarctic Research Expedition executed by China ‘Xuelong’ vessel, some oceanographic features are described as follow: In the west of the Prydz Bay, about the range of 71-72oE, there exists a clockwise mesoscale eddy. Owing to the existence of eddy, the ice shelf water flows mainly eastward, and it flows to the northeast near 73o30' E. In summer, the thickness of the surface water in the eastern section is about 20m, influenced by the eddy that in the western section is approximately 50m. Within the water less than 50m, water temperature in deeper layer slightly greater than in surface, i.e. so called temperature inversion layer, which is caused by freezing and melting of the sea ice. In the west of the section, there appears ‘static instability’ at many stations about 160m~200m in depths, i.e. the density is greater than that in lower with several meter in thickness. Advection mixing diffusion may be the main causing factor for this instability.

【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 ; 极区海冰与海洋过程遥感监测技术

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