Effects of Waves on Tabular Ice-Shelf Calving

Earth Interactions

DiandongRen¹ 

关键词: Antarctic Ice Sheet;    Climate change;    Ice-shelf calving;    Tabular ice-shelf attrition;    Surface mass balance;    Ice-sheet–ocean interaction;   

DOI  :  10.1175/EI-D-14-0005.1

学科分类：地球科学(综合)

来源: American Geophysical Union

【 摘 要 】

AbstractAs a conveyor belt transferring inland ice to ocean, ice shelves shed mass through large, systematic tabular calving, which also plays a major role in the fluctuation of the buttressing forces. Tabular iceberg calving involves two stages: first is systematic cracking, which develops after the forward-slanting front reaches a limiting extension length determined by gravity–buoyancy imbalance; second is fatigue separation. The latter has greater variability, producing calving irregularity. Whereas ice flow vertical shear determines the timing of the systematic cracking, wave actions are decisive for ensuing viscoplastic fatigue. Because the frontal section has its own resonance frequency, it reverberates only to waves of similar frequency. With a flow-dependent, nonlocal attrition scheme, the present ice model [Scalable Extensible Geoflow Model for Environmental Research-Ice flow submodel (SEGMENT-Ice)] describes an entire ice-shelf life cycle. It is found that most East Antarctic ice shelves have h...

【 授权许可】

Unknown