jgg     2015 35 (4):  640-644    ISSN: 0412-1961  CN: 21-1139/TG Analysis of Greenland Ice Mass Change Based on GRACE 1 Faculty of Geosciences and Environment Engineering，Southwest Jiaotong University，West High-Tec Zone, Chengdu 611756，China Received: 2014-06-06  Revised: null  Online: 2015-07-29 Supporting info