Assessment of terrestrial water contributions to polar motion from GRACE and hydrological models
文献类型：期刊论文
| 作者 | Jin, S. G.1; Hassan, A. A.1,2; Feng, G. P.1,2 |
| 刊名 | JOURNAL OF GEODYNAMICS
 |
| 出版日期 | 2012-12-01 |
| 卷号 | 62期号:0页码:40-48 |
| 关键词 | Polar motion Hydrological excitation GRACE Hydrological models |
| 英文摘要 | The hydrological contribution to polar motion is a major challenge in explaining the observed geodetic residual of non-atmospheric and non-oceanic excitations since hydrological models have limited input of comprehensive global direct observations. Although global terrestrial water storage (TWS) estimated from the Gravity Recovery and Climate Experiment (GRACE) provides a new opportunity to study the hydrological excitation of polar motion, the GRACE gridded data are subject to the post-processing de-striping algorithm, spatial gridded mapping and filter smoothing effects as well as aliasing errors. In this paper, the hydrological contributions to polar motion are investigated and evaluated at seasonal and intra-seasonal time scales using the recovered degree-2 harmonic coefficients from all GRACE spherical harmonic coefficients and hydrological models data with the same filter smoothing and recovering methods, including the Global Land Data Assimilation Systems (GLDAS) model, Climate Prediction Center (CPC) model, the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis products and European Center for Medium-Range Weather Forecasts (ECMWF) operational model (opECMWF). It is shown that GRACE is better in explaining the geodetic residual of non-atmospheric and non-oceanic polar motion excitations at the annual period, while the models give worse estimates with a larger phase shift or amplitude bias. At the semi-annual period, the GRACE estimates are also generally closer to the geodetic residual, but with some biases in phase or amplitude due mainly to some aliasing errors at near semi-annual period from geophysical models. For periods less than 1-year, the hydrological models and GRACE are generally worse in explaining the intraseasonal polar motion excitations. (C) 2012 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] | GRAVITATIONAL-FIELD ; EARTHS ROTATION ; EXCITATIONS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000312169900008 |
| 公开日期 | 2014-09-24 |
| 源URL | [http://119.78.226.72//handle/331011/15306]  |
| 专题 | 上海天文台_空间导航与定位技术重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jin, S. G.,Hassan, A. A.,Feng, G. P.. Assessment of terrestrial water contributions to polar motion from GRACE and hydrological models[J]. JOURNAL OF GEODYNAMICS,2012,62(0):40-48. |
| APA | Jin, S. G.,Hassan, A. A.,&Feng, G. P..(2012).Assessment of terrestrial water contributions to polar motion from GRACE and hydrological models.JOURNAL OF GEODYNAMICS,62(0),40-48. |
| MLA | Jin, S. G.,et al."Assessment of terrestrial water contributions to polar motion from GRACE and hydrological models".JOURNAL OF GEODYNAMICS 62.0(2012):40-48. |
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来源：上海天文台
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