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地球科学进展  2015, Vol. 30 Issue (3): 346-356    DOI: 10.11867/j.issn.1001-8166.2015.03.0346
研究论文     
2012年夏季挪威海和格陵兰海水文特征分析
王晓宇, 赵进平, 李涛, 钟文理, 矫玉田
中国海洋大学物理海洋重点实验室,海洋环境学院,山东 青岛 266100
Hydrographic Features of the Norwegian Sea and the Greenland Sea in Summer 2012
Wang Xiaoyu, Zhao Jinping, Li Tao, Zhong Wenli, Jiao Yutian
Key Laboratory of Physical Oceanography, MOE, College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China
 全文: PDF(12697 KB)   HTML
摘要:

利用2012年夏季在北欧海(挪威海和格陵兰海)的水文考察数据,对调查区域内海洋水团性质和分布进行了分析,并对北欧海冷却对流的发展加深过程进行了研究。在上层,从东侧暖而咸的大西洋水跨越锋区至西侧低温低盐的格陵兰海盆上层水体,温度和盐度的变化分别可以达到8 ℃和0.4 psu。中层与深层水体的性质则相对均匀和稳定,3个海盆内从浅至深依次分布着北极中层水、海盆深层水、北极深层水以及海盆底层水。格陵兰海盆中深层水体在3 500 m深度上位温约为-0.97 ℃,相比较1970s观测到的-1.30 ℃,升温幅度超过了0.3 ℃,表明海盆深层存储的热量显著增加。在只考虑局地表面冷却的简化条件下,当前格陵兰海内部通过冷却对流混合至季节性跃层下界需要向大气释放0.9×109~1.2×109 J的热量,这一过程至少需要2个月的时间而不利于对流向深层的发展。大量的热量被存储于北欧海深海盆中使得北欧海已经成为北半球高纬海域的热量存储器,对当前北极气候变化的影响有待深入研究。

关键词: 水团分布深层增暖北极中层水冷却对流北欧海    
Abstract:

Based on observations during the 5th Chinese Arctic expedition in 2012, the property and distribution of water masses were identified and the evolution of cooling convection was studied. In the upper layer, from the warm and salty Atlantic waters, which mainly lie on the east, westerly to the cold and fresh Greenland upper waters, the temperature and the salinity decreases were about 8 ℃ and 0.4 psu respectively. As for the intermediate and deep waters, water properties were more homogeneous and stable. Along with the depth deepening, there existed the Arctic Intermediate Water, the Basin Deep Water, the Arctic Deep Water and the Basin Bottom Water in all the three deep basins. In the center of the Greenland Basin, the potential temperature was about -0.97 ℃ at depth 3 500 m, which was nearly 0.3 ℃ warmer compared to the value -1.30 ℃ observed in 1970s, implying a heat increase in the deep layer. Under a simplified hypothesis only concerning the surface cooling to erode the seasonal pycnocline, now a total heat loss of about 0.9×109~1.2×109 J/m2 was needed for the upper ocean of the Greenland Sea. This process may take at least two months and thus leaves less time for the following deepreaching convection. At present, the Nordic seas are becoming a heat reservoir on the northern hemisphere and impacts of such change on the Arctic climate are worthy of further study.

Key words: Arctic intermediate water    Cooling convection.    Water masses    Abyssal warming    Nordic Seas
出版日期: 2015-03-20
ZTFLH:  P731  
基金资助:

国家自然科学基金重点项目“北极海冰与上层海洋环流耦合变化及其气候效应”(编号:41330960); 全球变化研究国家重大科学研究计划“北极海冰减退引起的北极放大机理与全球气候效应”(编号: 2015CB953900)资助

作者简介: 作者简介:王晓宇(1988-),男,山东蓬莱人,博士研究生,主要从事极地物理海洋学研究. E-mail: wangxiaoyu331@163.com
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引用本文:

王晓宇, 赵进平, 李涛, 钟文理, 矫玉田. 2012年夏季挪威海和格陵兰海水文特征分析[J]. 地球科学进展, 2015, 30(3): 346-356.

Wang Xiaoyu, Zhao Jinping, Li Tao, Zhong Wenli, Jiao Yutian. Hydrographic Features of the Norwegian Sea and the Greenland Sea in Summer 2012. Advances in Earth Science, 2015, 30(3): 346-356.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2015.03.0346        http://www.adearth.ac.cn/CN/Y2015/V30/I3/346

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