基于GRACE数据的格陵兰冰盖质量变化研究

摘要

基于GRACE得到的时变地球重力场数据反演了格陵兰冰盖2002～ 2011年期间的质量变化.结果表明:格陵兰冰盖2002～2011年的年消融总量为188±10km3/a,2002年以来冰盖整体的消融速率呈现出增加趋势；冰盖的消融区域主要集中在冰盖的东南部和西北部；自2008年以来,冰盖东南部的消融速率虽然有所放缓,但消融速率仍然维持在55±7km3/a；冰盖西北部的消融速率仍在增加,2008年以后达到了48 ±6km3/a.%In this paper,the GRACE data is used to obtain estimates of the mass variations of Greenland ice sheet.A mass loss estimate of 188±10 km3/a for the Greenland ice sheet is obtained from 2002 to 2011 based on GRACE satellite data.The mass loss of entire Greenland ice sheet is still accelerating since 2002.GRACE measurements also reveal significant ice losses in southeast and northwest Greenland.Ice losses in southeast Greenland appear to have slowed down since 2008.Because that the deceleration is weak,and southeast Greenland still appears to be losing ice mass at a high rate which can reach to 55 ±7 km3/a.While northwest Greenland show continued accelerations in recent years,it has increased to 48±6 km3/a after 2008.