大地测量观测和相对海平面联合约束的冰川均衡调整模型

被引:17
作者
汪汉胜 [1 ]
WU Patrick [2 ]
van der Wal Wouter [3 ]
贾路路 [1 ,4 ]
胡波 [1 ,4 ]
王志勇 [5 ]
机构
[1] 中国科学院测量与地球物理研究所动力大地测量学重点实验室
[2] Department of Geoscience,University of Calgary
[3] Department of Earth Observation and Space Systems,Delft University of
基金
国家杰出青年科学基金; 加拿大自然科学与工程研究理事会;
关键词
大地测量观测; 相对海平面; 冰川均衡调整; 横向非均匀; 地慢黏滞度;
D O I
暂无
中图分类号
P227 [动态大地测量];
学科分类号
摘要
利用大地测量和历史相对海平面变化数据,结合地震剪切波层析模型,联合确定了新的末次冰期冰川均衡调整(GIA)模型,其中地慢黏滞度不仅沿径向而且沿横向变化.研究思路是,先尝试性地选择比例系数β,利用与地震剪切波速异常的线性关系,计算地幔黏滞度横向扰动,并与横向均匀的黏滞度参考模型叠加给出3D地慢黏滞度模型;再利用耦合拉普拉斯方程的有限元法算法进行GIA预测;然后,重复该过程,直到预测与观测之间的吻合满意为止.主要结论有:(1)给出了横向非均匀的地幔黏滞度模型(RF3L20(β=0.4)),发现了黏滞度显著的横向非均匀性和其对GIA预测的显著影响,指出横向非均匀不完全是由热效应引起的,可能还与化学组分等其他因素有关,该模型可用于地慢动力学研究.(2)给出了全球现今多种GIA预测速率,可为板块运动、陆地水储量、海水质量变化和冰川冰雪质量非平衡监测提供重要的改正.
引用
收藏
页码:2450 / 2460
页数:11
相关论文
共 12 条
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