温度变化对中国大陆三维周年位移的影响

摘要

除了地表质量重新分布外,地表温度变化是影响地表周年变化的另一重要成因.本文利用全球温度变化数据,基于三维全空间热弹性形变模型,计算温度变化在中国大陆引起的地表热弹性形变,并讨论它对中国大陆三维周年位移的影响.结果表明,温度变化引起的地表周年变化振幅在毫米量级.中国大陆构造环境监测网络(简称:陆态网络)GPS台站受地表温度变化影响最大的台站是HLAR(海拉尔),东向、北向以及垂向的周年振幅矢量和为~22.93mm;影响最小的台站是HIYS(永暑礁),东向、北向以及垂向的周年振幅矢量和为~01.77mm.为了说明温度变化对地表周年形变的影响,本文联合GRACE以及物质负荷模型(MODEL)研究中国大陆地表三维周年位移.考虑温度变化后的MODEL、GRACE获取的地表周年形变在东向、北向、垂向的周年信号分别改进了6%、6%、2%;16%、5%、15%.结果表明,温度变化是物质负荷以外引起大陆地表形变的重要因素.%In this paper ,we explore the thermoelastic seasonal deformation in Chinese mainland based on the 260 GPS sites of crustal movement observation network of China (CMONOC) .The results show that the change of land surface temperature can induce remarkable surface deformation in China .The most affected site is HLAR in Inner Mongoli a ,China .Its seasonal amplitude of surface deformation is about ~22.93 mm . and the site HIYS in Hainan is the least affected .The seasonal amplitude of surface deformation is about~01.77 mm .Applying the thermoelastic seasonal deformation information in GRACE data analysis and the Mass loading models (MODEL) ,refined three-dimensional seasonal deformation map are derived .Taking GPS measurements as references,refined results show that the annual deformation derived from the MODEL and the GRACE data have been improved by about 6% ,6% ,2% ;16% ,5% ,15% in the east ,north and height components respectively .