极地研究 ›› 2006, Vol. 18 ›› Issue (1): 63-74.

• 目次 • 上一篇    

南极冰盖与冰川的快速变化

王亚凤;温家洪;刘吉英;   

  • 出版日期:2006-03-30 发布日期:2006-03-30

RAPID CHANGES OF THE ANTARCTIC ICE SHEET AND GLACIERS

  • Online:2006-03-30 Published:2006-03-30

摘要:

近10年的观测研究表明,南极冰盖和冰川存在快速的变化阿蒙森海扇区的主要冰流系统正在迅速变薄,减薄趋势可上溯至内陆150km处;罗斯冰流出现了停滞或明显减速,有的流动方向发生了改变,引发冰流袭夺;南极半岛冰架大面积崩塌,补给冰川加速,冰川出现了跃动;变暖的海水进一步侵蚀了冰架,着地线附近底部冰层融化强烈。上述发现改变了南极冰盖缓慢变化的传统观点,并对今后的冰川动力学研究,冰流模型模拟,冰盖物质平衡研究及预测具有重要意义。

关键词: 冰流;快速变化;南极冰盖

Abstract:

Observations of the Antarctic Ice Sheet in recent years have revealed rapid and substantial changes occurring on the ice sheet on relatively short time scales. The principal drainage systems of Amundsen Sea Sector in West Antarctic are thinning rapidly, and the pattern of thinning extends to the interior of up to 150 km. Ice Stream C has slowed down while the flow in some areas has changed direction in the Ross Sea Sector. Vast areas of the Antarctic Peninsula Ice Shelves have collapsed, resulting in the acceleration and surge of tributary glaciers. Basal melting near the grounding lines is substantially due to erosion of a warm ocean. These evidences lead to our view that the Antarctic Ice Sheet is slowly changing and homogeneous has radically altered. This finding has important consequences for the ice dynamic study, ice sheet modeling and the mass balance assessment and its response to climate forcing.