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2008年加拿大海盆次表层暖水的精细结构的研究

, PP. 11-19

Keywords: 加拿大海盆,次表层暖水,精细结构,海冰变化

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Abstract:

自2004年以来,在加拿大海盆频繁发生的次表层暖水(nearsurfacetemperaturemaximum,NSTM)现象是北极快速变化响应的事实之一。采用2008年中国第3次北极科学考察的CTD数据和西北冰洋联合研究计划与美国波弗特环流观测系统计划2008年航次的CTD数据以及冰浮标ITP18数据,对加拿大海盆的NSTM现象进行了精细结构的分析。结果表明,NSTM的温度垂直结构与海冰关系密切,在海冰密集度较大的区域,发展成熟的NSTM的盐跃层稳定,温度极大值均小于-1.0℃,而且垂向温度结构差异不大,多为典型的单峰结构;在海冰边缘区和开阔水域,由于受气象条件的影响较大,盐跃层不十分稳定,温度极大值和温度的垂向分布差异较大,常出现双峰甚至多峰结构。NSTM温度极大值出现的深度不仅与NSTM发生、发展的时间有关,而且与纬度有关,纬度越高,深度越深。NSTM的发生、发展和消衰的时间尺度为1a,夏季发生,秋季和冬季不断向表层和下层传递热量,温度峰值变小,第二年的春季消失。

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