1979-2014年南极海冰运动特征分析

Analysis of kinematic characteristics of Antarctic sea ice from 1979 to 2014

在南极海冰缓慢增加的背景下,用美国冰雪数据中心的月平均海冰运动数据,分析了1979-2014年南极海冰的运动特征。结合月平均风速资料,探讨了风速对南极海冰运动变化的影响。结果表明:1979-2014年南极海冰运动速度总体上呈增加趋势,其中冬季平均运动速度最大,然后是秋季、春季,夏季最小。威德尔海和罗斯海作为南极海冰分布最多的2个子海区,海冰的平均运动速度均呈现加快趋势,冬季海冰平均运动速度增加趋势均比夏季强。南极海冰运动速度与风速在季节和年平均变化趋势上保持高度一致,存在较为显著的正相关关系,所以风速增大是导致南极海冰运动速度加快的一个重要原因。

In the context of a slow increase in Antarctic sea ice, based on monthly mean sea ice velocity data provided by National Snow and Ice Data Center, the characteristics of the Antarctic sea ice motion in 1979 to 2014 are analyzed. The effect of wind speed on Antarctic sea ice motion is discussed in combination with monthly mean wind speed data. The results show that the Antarctic sea ice velocity is generally increasing from 1979 to 2014, in which the average velocity in winter is the largest, followed by autumn, spring and summer. Sea ice velocity in Weddell Sea and Ross Sea is also accelerating and the average trend of sea ice velocity in winter is stronger than that in summer. The Antarctic sea ice velocity and wind speed are consistent with the seasonal and annual change trends and there is a significant positive correlation between them. Therefore, the strength of wind speed is an important influencing factor for the increase of sea ice velocity.