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白令海和楚科奇海位于北极太平洋一侧的海冰外缘线附近,具有较强烈的气冰海相互作用.采用滑动t检验和小波分析方法对白令海和楚科奇海1953—2004年海冰范围的年际变化、年代际变化和总体趋势变化进行分析.结果表明:20世纪70年代后期,海冰范围在白令海存在显著的均值突变现象,而楚科奇海在对应阶段则表现为更明显的变频现象;在突变点前后两个时段里,阿留申低压中心低压加强、核心位置偏移以及对应风场分布的变化是导致白令海海冰范围明显缩小的主要动力原因.楚科奇海海冰范围的年际变化中存在由低频向高频变化的现象,该现象除了在局地气温变化中存在之外,在北冰洋区域风涡度、波弗特海纬向风、东西伯利亚海经向风等动力因素中也有所体现.因此,除热力因素外,动力因素引起的海冰的平流与该变频现象也存在一定的联系.
The Bering Sea and the Chukchi Sea are located near the edge of the Arctic Pacific Sea near the edge of the sea ice and have a strong ice-water interaction. The sliding t-test and wavelet analysis were used to analyze the Bering Sea and Chukchi Sea The interannual variation, the interdecadal variation and the general trend change of the ice range are analyzed.The results show that the sea ice range has a significant mean value abrupt change in the Bering Sea in the late 1970s, while the Chukchi Sea has more performance in the corresponding stage Obvious frequency conversion phenomenon.The low pressure of Aleutian center, core position shift and corresponding wind field distribution change are the main driving forces that cause the sea ice range of Bering Sea to shrink obviously in the two periods before and after the mutation point.Chucke Sea There is a phenomenon in the interannual variation of ice range from low frequency to high frequency. In addition to the existence of local temperature changes, the phenomenon of wind vorticity in the Arctic Ocean, the Beaufort Sea zonal wind, the East Siberia sea direction Wind and other dynamic factors are also reflected.Therefore, in addition to thermal factors, the advection of sea ice caused by the dynamic factors and the frequency conversion phenomenon also has some connection.