| 大气角动量变化以及对地球自转季节变化的激发 |
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| 引用本文： | 钟敏,闫昊明,朱耀仲,雷小平.大气角动量变化以及对地球自转季节变化的激发[J].天文学报,2002,43(1):90-98. |
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| 作者姓名： | 钟敏 闫昊明 朱耀仲 雷小平 |
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| 作者单位： | 中国科学院测量与地球物理研究所动力大地测量学开放室,武汉,430077 |
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| 基金项目： | 国家自然科学基金（批准号 49904002），国家攀登项目（970231003）资助 |
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| 摘 要： | 利用日本气象局AMIPⅡ大气数值模式的输出结果，基于BP方法和SP方法计算了1979年至1996年大气角动量变化以及对地球自转季节变化激发的差异。利用最小二乘谐波拟合方法和气候平均图方法，分析了大气角动量的季节变化，并与同时期采用NCEP再分析资料和JMA客观分析资料计算的大气角动量进行比较。
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| 关 键 词： | 大气解动量 地球自转 大气环流模式比较计划 AMIP 季节变化 |
| 修稿时间： | 2001年2月13日 |
Atmospheric Angular Momentum Fluctuations and the Excitations on Earth Rotation at Seasonal Scale |
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| ZHONG Min,YAN Hao-Ming,ZHU Yao-Zhong,LEI Mao-Ping.Atmospheric Angular Momentum Fluctuations and the Excitations on Earth Rotation at Seasonal Scale[J].Acta Astronomica Sinica,2002,43(1):90-98. |
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| Authors: | ZHONG Min YAN Hao-Ming ZHU Yao-Zhong LEI Mao-Ping |
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| Abstract: | The atmospheric contributions to seasonal variations in polar wobble and length of day are discussed for the period 1985-1995. The atmospheric motion is a main excitation source for Earth Rotation, which variation can duly reflect polar wobble and length of day change on all relevant time-scales, ranging from months to several years. The atmospheric angular momentum functions, calculated from the output data of GSM9603 GCM of Japan Meteorological Agency (JMA) anticipating in the second phase of atmospheric model inter-comparison project (AMIP II), are compared with those calculated from the reanalysis data of the National Centers for the Environmental Prediction (NCEP) / National Center for Atmospheric Research (NCAR), and from the operational objective analysis data of JMA, respectively. The results show that the different vertical wind integration methods lead to different wind contributions to the functions inferred from the observed wobble in seasonal variations, especially for the component along Greenwich meridian direction in annual variation. During the period from 1985 to 1995, the agreements of the pressure terms among these three equatorial AAM functions along 900 East are better than those are along Greenwich meridian direction. The axial relative AAM function simulated from GSM 9603 agrees well with the other two relative AAM functions in seasonal variations, with more moderate amplitudes better than the composite axial relative AAM functions estimated from 23 GCM models anticipating in the first phase of AMIP. In addition, its inter-annual variation from 1979 to 1996 shows the main characteristics of ENSO evolution as the axial relative AAM function estimated from NCEP reanalysis data, except for the period of anomalous ENSO from 1991 to 1993. |
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| Keywords: | atmospheric angular momentum earth rotation atmospheric model intercomparison project |
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