Reducing leakage error in GRACE-observed long-term ice mass change: a case study in West Antarctica
文献类型：期刊论文
| 作者 | Chen, J. L.1; Wilson, C. R.1,2; Li, Jin3 ; Zhang, Zizhan4
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| 刊名 | JOURNAL OF GEODESY
 |
| 出版日期 | 2015-09-01 |
| 卷号 | 89期号:9页码:925-940 |
| 关键词 | GRACE Gravity Forward modeling Leakage error Antarctica Mass rate |
| 英文摘要 | Spatial leakage is a major limitation for quantitative interpretation of satellite gravity measurements from the gravity recovery and climate experiment (GRACE). Using synthetic data to simulate ice mass changes in the Amundsen Sea Embayment and Antarctic Peninsula, we analyze quantitatively the effects of a limited range of spherical harmonics (SH) coefficients and additional filtering, which in combination can significantly attenuate signal amplitudes. We present details of a forward modeling algorithm and show that it is capable of removing these biases from GRACE estimates. Examples show how to implement the method by constraining locations of presumed mass changes, or leaving these locations unspecified within a continental region. Our analysis indicates that leakage effects from far-field mass signals (e.g., terrestrial water storage change and glacial melting over other continents) on Antarctic mass rate estimates appear to be negligible. However, leakage from long-term ocean bottom pressure change in the surrounding Antarctic Circumpolar Current regions may bias Antarctic mass rate estimates by up to 20 Gigatonne per year (Gt/year). Experiments based on proxy GRACE measurement noise indicate that the effects of GRACE spatial noise on estimated Antarctic mass rates via constrained and unconstrained forward modelings are 5 and 15 Gt/year, respectively. |
| WOS标题词 | Science & Technology ; Physical Sciences ; Technology |
| 类目[WOS] | Geochemistry & Geophysics ; Remote Sensing |
| 研究领域[WOS] | Geochemistry & Geophysics ; Remote Sensing |
| 关键词[WOS] | GRAVITY-FIELD ; INVERSION ; BALANCE ; SHEETS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000360709400006 |
| 公开日期 | 2015-11-10 |
| 源URL | [http://119.78.226.72/handle/331011/28241]  |
| 专题 | 上海天文台_天文地球动力学研究中心 |
| 作者单位 | 1.Univ Texas Austin, Ctr Space Res, Austin, TX 78712 USA 2.Univ Texas Austin, Dept Geol Sci, Jackson Sch Geosci, Austin, TX 78712 USA 3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai, Peoples R China 4.Chinese Acad Sci, State Key Lab Geodesy & Earths Dynam, Inst Geodesy & Geophys, Wuhan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, J. L.,Wilson, C. R.,Li, Jin,et al. Reducing leakage error in GRACE-observed long-term ice mass change: a case study in West Antarctica[J]. JOURNAL OF GEODESY,2015,89(9):925-940. |
| APA | Chen, J. L.,Wilson, C. R.,Li, Jin,&Zhang, Zizhan.(2015).Reducing leakage error in GRACE-observed long-term ice mass change: a case study in West Antarctica.JOURNAL OF GEODESY,89(9),925-940. |
| MLA | Chen, J. L.,et al."Reducing leakage error in GRACE-observed long-term ice mass change: a case study in West Antarctica".JOURNAL OF GEODESY 89.9(2015):925-940. |
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来源：上海天文台
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