气候态下的北极海冰运动特征-海洋预报

气候态下的北极海冰运动特征

单位：国家海洋环境预报中心国家海洋局海洋灾害预报技术研究重点实验室, 北京100081

分类号：P731.15

出版年·卷·期（页码）：2012·29·第六期（66-73）

摘要：

利用国际北极浮冰运动观测资料（IABP）（1979—2006年），分析了年平均、季节平均和月平均的北极海冰运动特征。分析结果表明，在不同时间尺度上，都体现出北极海冰运动的两个基本特征，即反气旋式的波弗特涡和穿极漂流，但是强度有所差异。6—9月，北极上空存在一个低压系统，导致海冰出现气旋式运动，穿极漂流较弱。波弗特涡中心在1—9月由加拿大海盆逐渐退缩至海岸附近，之后又向东西伯利亚海方向移动。北极海冰运动特征与海平面气压有密切关系，但北极表层洋流的作用也是不可忽略的，尤其是弗雷姆海峡附近海域。

Based on the International Arctic Buoy Programme (IABP) dataset (1979—2006), the characteristics of Arctic sea ice motion is studied on annual, seasonal and monthly average. Two obvious features, the anticyclonic Beaufort gyre and transpolar drift, are shown, while the strength and sizes of those are different in these three time scales. There is a low-pressure system over the Arctic from June to September, which drives a cyclonic sea ice motion and weakens the transpolar drift. The center of Beaufort gyre generally retreats from Canada Basin to the coast from January to September, and then moves towards the East Siberian Sea. Although SLP has an important influence on sea ice motion, the impact of Arctic surface current cannot be ignored, especially in the Fram Strait.

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