Detecting Excitation Source of the Chandler Wobble

检测钱德勒摆动的激励源

• 批准号: 02804025
• 负责人: NAITO Isao
• 金额: $ 0.45万
• 依托单位: National Astronomical Observatory
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02804025/
• 关键词: Earth Rotation; Chandler Wobble; Angular Momentum; QBO; Non-Linear; El Nino; 極運動; 季節内変動; 自転速度; 不規則変動; El Nino; コア・マントル結合; 気象庁デ-タ

The earth is a dynamically coupled system of atmosphere, hydrosphere, mantle and core under conservation of angular momentum. There are many observational facts that global changes in solid-earth system including core as well as in atmosphere-hydrosphere system have been closely connected with angular momentum exchanges between the above two systems.In order to explain these facts, this paper presents a model that a non-linear feedback system of atmosphere-hydrosphere having a period-length doubling harmonics with the two typical spherical harmonics modes which excite the wobble and LOD controls excitation of the Chandler wobble and hence causes global changes in the solid-earth system such as change in worldwide seismic activity and geomagnetic change with periods of decades.The observational facts reveal that the earth's dynamic coupling system causing these global changes may be closed in a period of about 40 years. The model can straight lead to a previous view that the present day climatic fluctuation closely correlated with the decades variations of the lengthof day and the wobble amplitude.

地球是一个角动量守恒的大气、水圈、地幔和地核动力学耦合系统。许多观测事实表明，包括地核在内的固体地球系统以及大气-水圈系统的全球变化都与这两个系统之间的角动量交换密切相关，为了解释这些事实，本文提出了一个大气-水圈具有周期的非线性反馈系统模型，具有激发摆动和LOD的两个典型球面谐波模式的长度加倍谐波控制钱德勒摆动的激发，并因此引起固体中的全局变化。观测事实表明，引起这些全球变化的地球动力耦合系统可能在40年左右的时间内闭合。该模型直接导致了现今气候波动与日长和摆动幅度的年代际变化密切相关的观点。

项目成果

内藤 勲夫,菊地 直吉: "Reply to Rosen & Salstein's Comment" Geophys.Res.Lett.18. 1927-1928 (1991)

Isao Naito、Naoyoshi Kikuchi：“回复 Rosen 和 Salstein 的评论”Geophys.Res.Lett.18（1927-1928）。

内藤 勲夫,菊地 直吉: "A Seasonal Budget of the Earth's Axial Angular Momentum" Geophys.Res.Lett.

Isao Naito、Naoyoshi Kikuchi：“地球轴向角动量的季节性预算”Geophys.Res.Lett。

内藤 勲夫,菊地 直吉: "Wiud Contribution to the Annual Wobble" Geopluys.Res.Lett.

Isao Naito、Naoyoshi Kikuchi：“Wiud 对年度摆动的贡献”Geopluys.Res.Lett。

内藤 勲夫,菊地 直吉: "Reply to Rosen & Salsten's Comment" Geophys.Res.Lett.

Isao Naito、Naoyoshi Kikuchi：“回复 Rosen 和 Salsten 的评论”Geophys.Res.Lett。

内藤 勲夫,菊地 直吉: "地球自転速度の不規則変動に対する大気の寄与" 天気(日本気象学会機関誌).

Isao Naito、Naoyoshi Kikuchi：“大气对地球自转速度不规则波动的贡献”天气（日本气象学会杂志）。