Revised atmospheric excitation function series related to Earth's variable rotation under consideration of surface topography
文献类型：期刊论文
| 作者 | Zhou, Y. H.; Salstein, D. A.; Chen, J. L. |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
 |
| 出版日期 | 2006-06-29 |
| 卷号 | 111期号:D12页码:1 |
| 英文摘要 | [ 1] The atmospheric angular momentum is closely related to variations in the Earth rotation. The atmospheric excitation function ( AEF), known also as the atmospheric effective angular momentum function, is introduced in studying the atmospheric excitation of the Earth's variable rotation. It may be separated into two portions, i.e., the "wind'' terms due to the atmospheric motion relative to the mantle and the "pressure'' terms due to the variations of atmospheric mass distribution evident through surface pressure changes. The AEF wind terms during the period of 1948 - 2004 are reprocessed from the National Centers for Environmental Prediction- National Center for Atmospheric Research (NCEP/NCAR) reanalysis 6-hourly wind and pressure fields. Some previous calculations were approximate, in that the wind terms were integrated from an isobaric lower boundary of 1000 hPa. To consider the surface topography effect, however, the AEF is computed by integration using the winds from the Earth's surface to 10 hPa, the top atmospheric model level, instead of from 1000 hPa. For these two cases, only a minor difference, equivalent to similar to 0.004 ms in length-of-day variation, exists with respect to the axial wind term. However, considerable differences, equivalent to 5 similar to 6 milliseconds of arc in polar motion, are found regarding equatorial wind terms. We further compare the total equatorial AEF ( with and without the topography effect) with the polar motion excitation function (PMEF) during the period of 1980 - 2003. The equatorial AEF gets generally closer to the PMEF, and improved coherences are found between them when the topography effect is included. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Meteorology & Atmospheric Sciences |
| 研究领域[WOS] | Meteorology & Atmospheric Sciences |
| 关键词[WOS] | ANGULAR-MOMENTUM FLUCTUATIONS ; POLAR MOTION ; LENGTH ; OCEAN ; VARIABILITY ; MODELS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000238938800001 |
| 源URL | [http://119.78.226.72/handle/331011/19420]  |
| 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 20030, Peoples R China 2.Atmospher & Environm Res Inc, Lexington, MA 02421 USA 3.Univ Maryland, NASA, Goddard Space Flight Ctr, Greenbelt, MD USA 4.Univ Texas, Ctr Space Res, Austin, TX 78712 USA |
| 推荐引用方式 GB/T 7714 | Zhou, Y. H.,Salstein, D. A.,Chen, J. L.. Revised atmospheric excitation function series related to Earth's variable rotation under consideration of surface topography[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2006,111(D12):1. |
| APA | Zhou, Y. H.,Salstein, D. A.,&Chen, J. L..(2006).Revised atmospheric excitation function series related to Earth's variable rotation under consideration of surface topography.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,111(D12),1. |
| MLA | Zhou, Y. H.,et al."Revised atmospheric excitation function series related to Earth's variable rotation under consideration of surface topography".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 111.D12(2006):1. |
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来源：上海天文台
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