摘要
南极冰川表面流速对于估算南极物质损失对海平面的影响至关重要。冰川表面流速是冰川运动的直接体现。冰川处于运动状态,由于受力不均衡就会出现变形,流速变化在一定程度上也反映了冰的应变。文章根据应力平衡方程,将流速分量取代应变,使用表面流速反演了东南极恩德比地的冰川冰的应变率,进而分析了典型冰川流动的物理机理。冰川冰的应变速率与冰川表面流速分布范围基本一致。内陆冰盖流动速度很小,应变速率也就很小;近海岸由于冰川密集,流速变化较大,应变速率相应的变化很明显。在冰架上的应变率呈现中间小、两侧大的趋势,与表面流速的大小截然相反。本研究为进一步研究冰川,建立冰盖、冰架模型奠定了基础。
Antarctic ice surface velocity was critical to estimating the impact of Antarctic mass loss on sea level.Ice surface velocity was a direct reflection of glacier movement.Glaciers were in a state of motion and deformed due to imbalanced forces.The changes in velocity also reflected the strain of ice to a certain extent.Based on the stress balance equation,the velocity component was used instead of the strain to invert the strain rate of glacial ice in Enderby Land,East Antarctica,and analyzed the flow mechanism of typical glaciers.The strain rate of glacial ice was basically consistent with the distribution range of glacial surface velocity.The inland ice sheet had a small flow velocity and a small strain rate.As the speed of glaciers near the coast varied greatly,the corresponding change in strain rate was also obvious.The strain rate on the ice shelf tended to be small in the middle and large on both sides,which was completely opposite to the surface velocity.This study laid the foundation for further research on glaciers and the establishment of ice sheet and ice shelf models.
作者
王康乐
Wang Kangle(College of Surveying and Geo-Informatics,Tongji University,Shanghai 200092,China)
出处
《信息通信》
2020年第3期11-13,共3页
Information & Communications
关键词
恩德比地
冰川流速
冰的应变率
分布趋势
流动机理
Enderby Land
ice velocity
ice strain rate
distribution trends
flow mechanism
