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地球科学进展  2011, Vol. 26 Issue (10): 1079-1091    DOI: 10.11867/j.issn.1001-8166.2011.10.1079
研究论文     
北欧海的锋面分布特征及其季节变化
何琰,赵进平
中国海洋大学海洋环境学院,山东青岛266100
Distributions and Seasonal Variations of Fronts in GIN Seas
He Yan, Zhao Jinping
Key Laboratory of Physical Oceanography, Ministry of Education, Ocean University of China, Qingdao266100, China
 全文: PDF(1473 KB)  
摘要:

利用多年月平均格点数据分析了北欧海主要锋面的分布特征和季节变化规律,并讨论了月平均数据分析锋面适合使用的方法。月平均数据显示的锋面出现间断或多重的现象是锋面侧向摆动造成的,这是月平均数据的一大特点。北欧海各锋面主要水文和季节变化特征差异很大。东格陵兰极地锋在夏季锋面强度大,锋面较连续完整,而冬季强度小,锋面结构零散。9月由于东格陵兰寒流势力最强,可观察到温度梯度较大且连续的东格陵兰锋。北极锋的季节变化在水平方向呈“哑铃型”分布,中段摆动较南北两端小。由于挪威海流在冬季出现的最大流量引起挪威海流的流幅在该处加宽,莫恩海脊锋冬季向西北移动,对前人文章中基本上没有季节性移动的说法进行了修正和补充。冰岛—法罗群岛锋随深度增加向南移动,锋面强度增强,这是溢流造成的。

关键词: 北欧海季节变化东格陵兰极地锋北极锋冰岛—法罗群岛锋    
Abstract:

The spatial distributions and seasonal variations of the main fronts in GIN seas are analyzed by grid data of monthly mean of temperature and salinity. The suitable application method for monthly data in frontal study is discussed. As the fronts often move or swing, the front information in monthly data has been blurred and the fronts obtained by monthly mean temperature and salinity sometimes show  interrupted front and multi-front phenomena. However, the blurry fronts are just the averaged status of fronts, which can only be revealed by monthly data. The fronts show significant diversity in their characteristics and seasonal variations. The East Greenland Polar Front (EGPF) is mainly a salinity front, being evident and continuous in summer and weak and interrupted in winter. The EGPF is also a temperature front in summer. The obvious temperature gradient and uninterrupted shape appears  in September, being attributed to the maximum temperature difference between the East Greenland Current and the return currents at that time, which keeps the location of EGPF relatively stationary. The Arctic Front (AF) has a seasonally spatial variation with "dumbbell" shape—The seasonal displacement near the northern and southern parts of the front is much larger than that in the middle part, showing the larger swinging amplitude there. AF near the Mohn Ridge was addressed as a no-motion part, however, AF by this study is revealed to move northwestward in winter because the flux of Norwegian Current reaches the maximum then and induces the broadest width of the current near the Mohn Ridge area. A special characteristic of the Iceland-Faroe Front is that the interface of the front appears more southward and stronger in deep part, which is caused by the overflow above the ridge.

Key words: GIN seas    Seasonal variance    East Greenland Polar Front    Arctic Front    Iceland-Faeroe Front.
收稿日期: 2011-04-28 出版日期: 2011-10-10
:  P731.21  
基金资助:

国家自然科学基金项目“北极涛动核心区的关键海洋学过程研究”(编号:40876006)资助.

通讯作者: 何琰(1984-),女,吉林四平人,博士研究生,主要从事极地物理海洋学研究.     E-mail: jane1103@ouc.edu.cn
作者简介: 何琰(1984-),女,吉林四平人,博士研究生,主要从事极地物理海洋学研究. E-mail:jane1103@ouc.edu.cn
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引用本文:

何琰,赵进平. 北欧海的锋面分布特征及其季节变化[J]. 地球科学进展, 2011, 26(10): 1079-1091.

He Yan, Zhao Jinping. Distributions and Seasonal Variations of Fronts in GIN Seas. Advances in Earth Science, 2011, 26(10): 1079-1091.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2011.10.1079        http://www.adearth.ac.cn/CN/Y2011/V26/I10/1079

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