Oceanic excitations on polar motion: a cross comparison among models
文献类型：期刊论文
| 作者 | Zhou, YH; Chen, JL; Liao, XH; Wilson, CR |
| 刊名 | GEOPHYSICAL JOURNAL INTERNATIONAL
 |
| 出版日期 | 2005-08-01 |
| 卷号 | 162期号:2页码:390-398 |
| 关键词 | excitation ocean general circulation model (OGCM) oceanic angular momentum (OAM) polar motion |
| 英文摘要 | Recent studies based on various ocean general circulation models (OGCMs) demonstrate that the oceans are a major contributor to polar motion excitations. In this paper, we analyse and compare observed non-atmospheric polar motion excitations with oceanic angular momentum (OAM) variations determined from four OGCMs, which include the parallel ocean climate model (POCM), a barotropic ocean model (BOM), the Estimating the Circulation and Climate of the Ocean (ECCO) non-data-assimilating model (ECCO-NDA) and the ECCO data-assimilating model (ECCO-DA). The data to be analysed span a 5-yr overlapped period from 1993 to 1997. At annual timescale, considerable discrepancies exist between POCM and the other three models, which result mainly from differences in annual components of the forcing wind fields. At semi-annual timescale, however, POCM shows better phase agreement with observed non-atmospheric polar motion excitation than the other three ocean models. At intraseasonal timescales, ECCO-DA yields better agreement with observations, and reduces the variance of non-atmospheric excitations by similar to 60 per cent, 10-20 per cent more than those explained by the other three models. However, at the very short periods of 4-20 days, the BOM estimates could explain about half of the observed variance, twice as much as that by ECCO-NDA, and also shows considerably better correlation with observations. Due to different modelling schemes and methods, significant discrepancies could arise with respect to the quality of modelling large-scale oceanic mass redistribution and current variation. A complete understanding of global oceanic contributions to polar motion excitation still remains a challenge. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Geochemistry & Geophysics |
| 研究领域[WOS] | Geochemistry & Geophysics |
| 关键词[WOS] | ANGULAR-MOMENTUM ; CIRCULATION MODEL ; EARTHS WOBBLE ; SEA-LEVEL ; VARIABILITY ; PRESSURE ; ROTATION ; ATMOSPHERE ; EQUATIONS ; SIGNALS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000230843800010 |
| 公开日期 | 2010-07-30 |
| 源URL | [http://119.78.226.72//handle/331011/10494]  |
| 专题 | 上海天文台_天文地球动力学研究中心 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Univ Texas, Ctr Space Res, Austin, TX 78712 USA 3.Univ Texas, Dept Geol Sci, Austin, TX 78712 USA 4.Chinese Acad Sci, United Ctr Astrogeodynam Res, Shanghai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, YH,Chen, JL,Liao, XH,et al. Oceanic excitations on polar motion: a cross comparison among models[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2005,162(2):390-398. |
| APA | Zhou, YH,Chen, JL,Liao, XH,&Wilson, CR.(2005).Oceanic excitations on polar motion: a cross comparison among models.GEOPHYSICAL JOURNAL INTERNATIONAL,162(2),390-398. |
| MLA | Zhou, YH,et al."Oceanic excitations on polar motion: a cross comparison among models".GEOPHYSICAL JOURNAL INTERNATIONAL 162.2(2005):390-398. |
入库方式： OAI收割
来源：上海天文台
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