Effects of global glacial isostatic adjustment on the secular changes of gravity and sea level in East Asia
文献类型：期刊论文
| 作者 | Wang, Han-Sheng ; Jia, Lu-Lu ; Wu, Patrick ; Hu, Bo |
| 刊名 | Chinese Journal of Geophysics-Chinese Edition
 |
| 出版日期 | 2010 |
| 期号 | 11页码:2590-2602 |
| 中文摘要 | We have developed a new glacial isostatic adjustment (GIA) model, RF3L20 (beta = 0 4) -ICE-4G, which is well constrained by geodetic measurements, relative sea levels and shear-weave tomographic data Based on this model we will show how GIA affects the secular rate of change of gravity and sea level in East Asia An advantage of this model is that the viscosities in the mantle are allowed to vary both in the radial and lateral directions The laterally homogeneous reference viscosities are given by model RF3 (modified form peltier's VM2) Lateral viscosity perturbations are converted from seismic tomographic data using the well-known scaling relationship multiplied by the factor beta The latter is used to quantify the contribution of thermal effect to lateral variation in shear wave velocity, and is chosen to be 0 4 by fitting the GIA data In addition, the deglacial phase of the ice loads is given by the ICE-4G model We assess the uncertainties of the GIA predictions by considering the differences between two reference viscosity models and two ice models The GIA predictions are computed using the coupled-Laplace Finite-Element Method The results show that GIA has obvious effects on the secular rate of change of gravity and sea level in East Asia For example, the GIA effect on gravity can be several tens of nGals per year which can be detected by superconducting gravimeter and future atomic gravimeters at the geodetic stations Harbin, Changchun, Taian, Jixian, Zhengzhou and Wuhan Also GIA is estimated to contribute 3%similar to 10% on the secular trends of equivalent water heights on land in East Asia The larger GIA effect appears in the west Tibetan Plateau, North China and Three Gorges Area From East China Sea to the Pacific Ocean, the relative effects of GIA can be 20%similar to 40% GIA has caused a long-term depression of the absolute sea level in the ocean area by 0 27 similar to 0 37 mm/a For the secular change in absolute sea level measured by satellite altimetry, the GIA effects can be 6 9% and 7 5% in Yellow Sea and East China Sea respectively For the 58 tide gauges, the average value of the observed long term RSL rate is 2 22 mm/a while the CIA effect is -d0 17 mm/a and the relative effect is 8 3% For the 14 gauges, the GIA effects are -0 3 similar to-0 4 mm/a Therefore the results of this paper provide useful GIA corrections, so that the weak signals from geodynamic processes in the East Asia can be revealed |
| 原文出处 | |
| 公开日期 | 2012-04-11 |
| 源URL | [http://ir.whigg.ac.cn/handle/342008/3305]  |
| 专题 | 测量与地球物理研究所_其他_期刊论文 |
| 推荐引用方式 GB/T 7714 | Wang, Han-Sheng,Jia, Lu-Lu,Wu, Patrick,et al. Effects of global glacial isostatic adjustment on the secular changes of gravity and sea level in East Asia[J]. Chinese Journal of Geophysics-Chinese Edition,2010(11):2590-2602. |
| APA | Wang, Han-Sheng,Jia, Lu-Lu,Wu, Patrick,&Hu, Bo.(2010).Effects of global glacial isostatic adjustment on the secular changes of gravity and sea level in East Asia.Chinese Journal of Geophysics-Chinese Edition(11),2590-2602. |
| MLA | Wang, Han-Sheng,et al."Effects of global glacial isostatic adjustment on the secular changes of gravity and sea level in East Asia".Chinese Journal of Geophysics-Chinese Edition .11(2010):2590-2602. |
入库方式： OAI收割
来源：测量与地球物理研究所
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