A new Delta LOD series in monthly intervals (1892.0-1997.0) and its comparison with other geophysical results
文献类型：期刊论文
| 作者 | Liao, DC; Greiner-Mai, H |
| 刊名 | JOURNAL OF GEODESY
 |
| 出版日期 | 1999-10-01 |
| 卷号 | 73期号:9页码:466-477 |
| 关键词 | variation of the length of day atmospheric angular momentum El Nino/Southern Oscillation core-mantle coupling |
| 英文摘要 | Using the Delta T (integrated variation of the Earth's rotation measured in terestrial time) series (1891.5-1955.5) derived from lunar occultation observations and the UT1-UTC (universal time-coordinated universal time) series (1955.5-1997.5) of the Bureau International de L'Heure/International Earth Rotation Service, a new Delta LOD (variation of the length of day) series in monthly intervals from 1892.0 to 1997.0 is calculated. Using digital filtering, the interannual and decadal components of the Delta LOD series are separated and then compared with those inferred from other geophysical quantities. It is shown that, on the interannual time scale, atmospheric processes can play an important role in exciting astronomical Delta LOD. However, the main oscillation with a mean period of about 5.8 years and peak-to-peak amplitude of about 0.3 ms in the residuals of Delta LOD(Astr) - Delta LOD(Wind) for 1968.0-1997.0 suggests that about half of the amplitude in astronomical Delta LOD must be excited by other geophysical processes, while on the decadal time scale the atmospheric excitation is too small. Geomagnetic core-mantle coupling may be a plausible source of the excitation of Delta LOD on the decadal time scale, but the geomagnetic data are still insufficient and an improved model of core-mantle coupling is required. |
| 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] | ATMOSPHERIC ANGULAR-MOMENTUM ; OF-DAY VARIATION ; EARTHS ROTATION ; EL-NINO ; POLAR MOTION ; CORE MOTIONS ; TIME SCALES ; MANTLE ; LENGTH ; FLUCTUATIONS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000083531300005 |
| 源URL | [http://119.78.226.72/handle/331011/28154]  |
| 专题 | 上海天文台_天文地球动力学研究中心 |
| 作者单位 | 1.Geoforschungszentrum Potsdam, D-14473 Potsdam, Germany 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liao, DC,Greiner-Mai, H. A new Delta LOD series in monthly intervals (1892.0-1997.0) and its comparison with other geophysical results[J]. JOURNAL OF GEODESY,1999,73(9):466-477. |
| APA | Liao, DC,&Greiner-Mai, H.(1999).A new Delta LOD series in monthly intervals (1892.0-1997.0) and its comparison with other geophysical results.JOURNAL OF GEODESY,73(9),466-477. |
| MLA | Liao, DC,et al."A new Delta LOD series in monthly intervals (1892.0-1997.0) and its comparison with other geophysical results".JOURNAL OF GEODESY 73.9(1999):466-477. |
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来源：上海天文台
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