| 极移的成因及其移动特征 |
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| 引用本文： | 宋贯一,王吉易,曹志成,宋晓冰,杨同林,张常慧.极移的成因及其移动特征[J].地球物理学进展,2006,21(2):416-425. |
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| 作者姓名： | 宋贯一 王吉易 曹志成 宋晓冰 杨同林 张常慧 |
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| 作者单位： | (河北省地震局，石家庄 050021) |
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| 基金项目： | 地震科学联合基金项目(306019)资助 |
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| 摘 要： | 作者发现：太阳辐射，地球自转与公转，黄、赤交角的存在，陆地和海洋在地球表面南、北半球的不规则、不对称地理分布，及地球内部因〖ZZ(〗核外液体〖ZZ)〗形成的分层结构，构成了一套天然的能使地球产生自由章动的日、地间动量（能量）相耦合的物理机制.经研究，由该机制产生的极移具有以下主要特征：（1）极移轨迹的运动周期为13个月（0.92周/年），该周期由二个主要分量组成，一个为12个月（1周/年），另一个是14.1个月（0.85周/年，即钱德勒周期）.（2）极移运动轨迹是是椭圆，短半轴（b）与长半轴(a)之比为0.86；扁率（a\|b/a）为1：7.1.（3）瞬时极移振幅|m|的变化：对1周/年项，|m|随太阳回归运动而变化，在二至点时最大，在二分点时最小，具有对称性；对0.85周/年项，|m|随太阳回归运动而变化，在夏至点最大，每年12月5日左右最小.（4）瞬时极移存在反向运动（由东向西）.在1周/年项极移运动中，自转极的正、反方向运动振幅的贡献各占50%；在0.85周/年项的极移运动中，反向运动的时间仅有33天，约占正向运动时间的1/10，正向运动振幅的贡献占96%，反向运动振幅的贡献大约占4%.（5）若以国际极点（CIO）为原点，自转极相对CIO的位移运动轨迹必然落在偏向于CIO的西侧.（6）极移振幅将长期保持下去而不会衰减，原因是太阳辐射为自转轴受迫摆动提供了长期、稳定的激发能源.
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| 关 键 词： | 太阳光压 自转轴摆动 钱德勒摆动 极移 |
| 文章编号： | 1004-2903（2006）02-0416-10 |
| 收稿时间： | 2005-07-10 |
| 修稿时间： | 2005-08-20 |
The cause of polar movement and its charateristics |
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| SONG Guan-yi,WANG Ji-yi,CAO Zhi-cheng,SONG Xiao-bing,YANG Tong-lin,ZHANG Chang-huan.The cause of polar movement and its charateristics[J].Progress in Geophysics,2006,21(2):416-425. |
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| Authors: | SONG Guan-yi WANG Ji-yi CAO Zhi-cheng SONG Xiao-bing YANG Tong-lin ZHANG Chang-huan |
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| Institution: | Seismological Bureau of Hebei province, Shijiazhuang 050021, China |
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| Abstract: | The authors find coupling mechanism of momentum(energy) of nutations between solar and earth.It is caused by solar radiation,earth's rotation and revolution, angle between ecliptic and equator,irregularity of oceans and continents between northen hemisphere and southen hemisphere and layer structure of earth's core.The mechanism has following features:(1)A cycle of polar movement is 13 months(0.92 cycles/year).It is composed by two components:'one is twelve months and the other is 14.1 months(0.85 cycle/year).(2)The orbit of polar movement is ellipse.Its ratio of short axis to long axis 0.86.(3)The variation of instant polar movement's amplitude |m| for 1 cycle/per year follows solar tropical movement reaching maximun at solstices and minimun at the equinoxes.For 0.85 cycle/yaer |m| changes with solar tropic movement,.Its maximun is at the summer solstice and its mimimun is around December 5th.(4)The instant polar movement has backward movement(from east to west).For item of 1 cycle/year the contribution to amplitude is equally 50% for forward and back ward of rotation axis of earth.However the backward movement only takes 33 days.It takes only obout obe tenth of forward movement.The contribution to amplitude by forward movement reaches 96%, while backward movment only 4%.(5)Taking CIO as orinignal point the movment orbit of rotation axis lies at west side of CIO.(6)The amplitude of polar movement can last forever and it can not decay.This is because solar radiation offers energy for movement of rotation axis of the earth. |
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| Keywords: | solar light pressure wobbling of earth's rotation Chandler wobble polar movement |
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