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利用GRACE时变位模型研究南极冰盖质量变化
引用本文:朱广彬, 李建成, 文汉江, 王正涛. 利用GRACE时变位模型研究南极冰盖质量变化[J]. 武汉大学学报 ( 信息科学版), 2009, 34(10): 1185-1189.
作者姓名:朱广彬  李建成  文汉江  王正涛
作者单位:1武汉大学测绘学院,武汉市珞喻路129号430079;2中国测绘科学研究院,北京市北太平路16号,100039
基金项目:国家自然科学基金资助项目(40637034,40874012,40704004);武汉大学地球空间环境与大地测量教育部重点实验室开放研究基金资助项目(07-05)
摘    要:对CNES/GRGS和UTCSR GRACE Level-2产品重力位模型的J2项时间序列进行了主成分分析和比较,结果表明,CNES/GRGSJ2项具有更好的季节性变化特征,利用CNES/GRGS GRACE Level-2产品推求了南极地区冰盖质量变化速率,并对西南极和东南极冰盖质量变化进行了主成分分析,获取了其周年项振幅和相位。分析表明,南极地区冰盖质量变化呈现出明显的地区不平衡性和季节性变化特征,西南极冰盖存在有较强的减少趋势,利用主成分重构和调谐分析方法获得的西南极和东南极冰盖质量变化的周年项振幅分别为2.4 cm和1.3 cm等效冰高。

关 键 词:GRACE  冰盖  南极  主成分分析  J2
收稿时间:2009-08-10
修稿时间:2009-08-10

Investigation on the Mass Variations of Ice Sheet in Antarctic with GRACE Time-variable Gravity Models
ZHU Guangbin, LI Jiancheng, WEN Hanjiang, WANG Zhengtao. Investigation on the Mass Variations of Ice Sheet in Antarctic with GRACE Time-variable Gravity Models[J]. Geomatics and Information Science of Wuhan University, 2009, 34(10): 1185-1189.
Authors:ZHU Guangbin  LI Jiancheng  WEN Hanjiang  WANG Zhengtao
Affiliation:1School of Geodesy and Geomatics,Wuhan University,129 Luoyu Road,Wuhan 430079,China;2Chinese Academy of Surveying and Mapping,16 Beitaiping Road,Beijing 100039,China
Abstract:In this paper,Empirical Orthogonal Functions(EOF) is used to analyze the time series of GRACE J2 inferred from CNES/GRGS and UTCSR to see the characteristics and the differences.The results show that the seasonal variation of J2 time series from CNES/GRGS is clearer than that from UTCSR.With CNES/GRGS GRACE Level-2 products,the mass rates of ice sheet in Antarctic are then computed.And,the mass variations in West Antarctic and East Antarctic are analyzed using EOF,whose annual amplitudes are also derived.The analysis indicates that the mass variations of ice sheet in Antarctic show regional seasonal change,the mass of ice sheet in West Antarctic is decreasing clearly.The annual amplitudes after EOF reconstruction and harmonic analysis in West Antarctic and East Antarctic are 2.4 cm and 1.3 cm respectively.
Keywords:GRACE  ice sheet  Antarctic  principal component analysis  J2
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