Seasonal and long-term vertical land motion in Southwest China determined using GPS, GRACE, and surface loading model
Seasonal and long-term vertical land motion in Southwest China determined using GPS, GRACE, and surface loading model
复制标题
利用GPS、GRACE和地表载荷模型确定西南地区季节性和长期垂直地面运动
DOI：
10.1186/s40623-021-01459-4
复制
发表时间：
2021-06
期刊：
影响因子：
--
通讯作者：
Zhan Wei
中科院分区：
文献类型：
--
作者：
Su Guangli;Zhan Wei
由于构造活动强烈，地表质量季节性变化明显，中国西南地区具有明显的陆地垂直运动特征。利用41个连续全球定位系统测站10年来的观测资料、重力恢复与气候试验(GRACE)和地表负荷模型(SLM)，确定了中国西南地区的垂直运动。水文负荷的年际变化是造成中国西南地区地表形变季节振荡的主要因素。GPS、GRACE和SLM观测到的季节形变具有一定的一致性，GPS/GRACE和GPS/SLM的相关系数分别为0.82和0.81。在从GPS时间序列中扣除GRACE和SLM的结果后，均方根值的平均下降分别为41.3%和38.0%。然而，三种产品的季节变形的年度幅度和相位存在一定的系统差异。例如，GRACE和SLM估计的平均振幅分别为7.4亿毫米和6.1百万毫米，小于GPS推导的振幅(9.7百万毫米)。此外，GPS/GRACE、GPS/SLM和GRACE/SLM之间的平均相位延迟分别为16、22和6天。GPS的数据处理误差和局部地球物理信号，以及GRACE和SLM对陆地水储量的低估是造成系统差异的共同原因。模拟数据表明，水文负荷的误判可以分别解释GRACE/GRACE、GRACE/SLM和GRACE/SLM之间约50%、和83%的相位延迟。此外，我们还从GPS的线性速率中减去Grace估计的载荷形变速率，得到了长期的地壳垂直运动速率。该地区地壳垂直运动与块体有关。滇中地块及其东部边界隆升，滇西南地块呈水平伸展状，呈下沉状态。上述研究成果可为西南中国地区水资源利用及地球动力学研究提供数据支持。
Owing to the intense tectonic activity and significant seasonal surface mass change, Southwest China is characterized by noticeable vertical land movement. We determined the vertical movement of Southwest China using 10 years of data from 41 continuous global positioning system (GPS) stations, gravity recovery and climate experiment (GRACE), and surface loading model (SLM). The annual variation in hydrological loading is the main factor causing the seasonal oscillation of surface deformation in Southwest China. Seasonal deformations captured by GPS, GRACE, and SLM are consistent to a certain extent, and the correlation coefficients between GPS/GRACE, and GPS/SLM are 0.82 and 0.81, respectively. After deducting the results yielded by GRACE and SLM from the GPS time series, the average reductions in root mean square were 41.3% and 38.0%, respectively. However, some systematic differences were observed among the annual amplitudes and phases of the seasonal deformations among the three products. For example, the average amplitudes estimated by GRACE and SLM were 7.4 mm and 6.1 mm, respectively, which were smaller than the amplitude deduced from GPS (9.7 mm). Furthermore, mean phase delays of 16, 22, and 6 days were observed between GPS/GRACE, GPS/SLM, and GRACE/SLM. The data processing errors and local geophysical signals in GPS and the underestimation of land water storage in GRACE and SLM were jointly responsible for the systemic differences. The simulated data show that the misestimating of hydrological loading can explain approximately 50%, 64%, and 83% of the phase delays between GPS/GRACE, GPS/SLM, and GRACE/SLM, respectively. In addition, we obtained long-term vertical crustal motion rates by subtracting the loading deformation rates estimated by GRACE from the linear rates of the GPS. The vertical crustal motion in this region is block-dependent. The Central Yunnan block and its eastern boundary are uplifted; meanwhile, the Southwest Yunnan block, which features stretching in the horizontal direction, appears to be subsiding. The aforementioned results can provide data support for the study of water resource utilization and geodynamics in Southwest China.
登录
查看更多内容
影响因子：
5.3
作者：
通讯作者：
--
DOI：
--
发表时间：
2018-04
期刊：
--
影响因子：
--
作者：
H. Save;B. Tapley;S. Bettadpur
通讯作者：
H. Save;B. Tapley;S. Bettadpur
影响因子：
4.8
作者：
J. Montillet;P. Tregoning;S. McClusky;Kegen Yu
通讯作者：
J. Montillet;P. Tregoning;S. McClusky;Kegen Yu
影响因子：
3.9
作者：
Dong, D;Fang, P;Miyazaki, S
通讯作者：
Miyazaki, S
质心静止的均匀弹性球体上由于表面温度变化而产生的位移
影响因子：
2.8
作者：
Fang, Ming;Dong, Danan;Hager, Bradford H.
通讯作者：
Hager, Bradford H.