华南前汛期降水与南极海冰变化的关系

RELATIONSHIP BETWEEN THE VARIATION OF ANTARCTIC SEA ICE AND THE PRE FLOOD SEASON RAINFALL IN SOUTHERN CHINA

摘要:

利用1973～1989年南极海冰北界资料和1972～1981年南半球气旋资料,分析南极海冰变异对华南前汛期降水的影响。结果表明,两者之间存在密切关系,当南极海冰面积趋于增大时,华南前汛期的雨水亦趋增加,反之亦然。2～3月份威尔克斯地方向的海冰北界位置与同年华南前汛期雨量密切相关。而9月份罗斯海方向(180°)海冰北界的伸缩对次年华南前汛期降水量有明显指示性。南半球低纬(0～30°S)的气旋活动在南极海冰与华南前汛期降水关系中起了“连结”作用。

关键词:南极海冰;华南前汛期降水;气旋活动

Abstract:

By using the data of latitude of Antarctic sea ice (1973～1989) as well as cyclone numbers (1972～1981) over the Southern Hemisphere, the influence of the changes of Antartctic sea ice on the pre flood season rainfall in Southern China has been analyzed. The results show that the pre flood season rainfall in southern China will increase with the Antarctic sea ice area, and vice versa. The north demarcation line of the sea ice facing Wilkes Land from February to March has close relation with the pre flood season rainfall in southern China. The stretch and withdrawal of the north demarcation line of Antarctic sea ice near the Ross Sea (180°) are indicative of the pre flood season rainfall in Southern China. The cyclone activity over the low latitude region of the southern Hemisphere acts a link between Antarctic sea ice and the pre flood season rainfall in Southern China.

Key words:Antarctic sea ice;pre flood season rainfall in Southern China;cyclone activity