Seasonal excitation of polar motion
文献类型：期刊论文
| 作者 | Chen, J. L.1,3; Wilson, C. R.1,2; Zhou, Y. H.3 |
| 刊名 | JOURNAL OF GEODYNAMICS
 |
| 出版日期 | 2012-12-01 |
| 卷号 | 62期号:1016页码:8-15 |
| 关键词 | Earth rotation Polar motion Excitation Atmosphere Ocean Hydrology GRACE |
| 英文摘要 | We estimate geophysical excitations (chi(1) and chi(2)) of polar motion using multiple sources of data, including recent atmospheric, oceanic, and hydrological models, satellite gravity measurements from the Gravity Recovery and Climate Experiment (GRACE), and compare geophysical excitations with observed polar motion excitations from space geodetic techniques. At seasonal time scales, both model-estimated excitations from the geophysical fluids envelope (i.e., atmosphere, ocean, and hydrosphere) and GRACE-observed excitations agree remarkably well with polar motion observations in the chi(2) component, and in the chi(1) component, model estimates and observed geodetic excitations show significant discrepancies. However, mass excitations estimated from GRACE show significantly better agreement with observed excitations than those from models, especially in chi(1). due to better quantification of terrestrial water storage and oceanic mass changes using GRACE data. Furthermore. GRACE satellite gravity measurements offer a unique means for quantifying contributions from cryospheric angular momentum (CAM) change, a component mostly neglected in previous studies due to the lack of adequate observations or reliable ice sheets models. Based on GRACE estimates, CAM excitations appear a minor, but not negligible contributor to seasonal excitations of polar motion. The significantly better agreement in chi(2) (than that in chi(1)) between observations and model excitations is related to the higher sensitivity of chi(2) excitations to atmospheric pressure and terrestrial water changes over the Eurasia and North American continents, because of the special relationship between the Delta S-21 spherical harmonic coefficient (proportional to chi(2)) mass model and the locations of the two continents. (C) 2011 Elsevier Ltd. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Geochemistry & Geophysics |
| 研究领域[WOS] | Geochemistry & Geophysics |
| 关键词[WOS] | MEAN SEA-LEVEL ; SATELLITE ALTIMETRY ; EARTHS POLE ; ICE LOSS ; GRACE ; BUDGET ; MASS ; VALIDATION ; MODEL |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000312169900003 |
| 公开日期 | 2014-10-27 |
| 源URL | [http://119.78.226.72//handle/331011/15345]  |
| 专题 | 上海天文台_行星科学重点实验室 |
| 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 USA 3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, J. L.,Wilson, C. R.,Zhou, Y. H.. Seasonal excitation of polar motion[J]. JOURNAL OF GEODYNAMICS,2012,62(1016):8-15. |
| APA | Chen, J. L.,Wilson, C. R.,&Zhou, Y. H..(2012).Seasonal excitation of polar motion.JOURNAL OF GEODYNAMICS,62(1016),8-15. |
| MLA | Chen, J. L.,et al."Seasonal excitation of polar motion".JOURNAL OF GEODYNAMICS 62.1016(2012):8-15. |
入库方式： OAI收割
来源：上海天文台
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