地球自转的天文地球动力学效应研究(Ⅱ)——地极移动与地球的较差转动
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摘要
详细讨论了地球自转变化的天文地球动力学效应 .地球表面的任何方向的水平运动 ,在惯性空间中看来都是转动 ,由此产生的离心力矩是地壳极移运动的原因 ,极移使地球发生相应的形变 ,也是大规模地壳运动和地震活动的原因之一 .此外 ,地球自转产生的Coriolis力是重力分异中的地球各圈层产生差异旋转运动的原因 ,地球的差异旋转是地球自转速率近十年变化、黄赤交角的非摄动长期变化以及近周日自由摆动的原因 .
In this paper, the astrogeodynamical effects on he earth's rotation are discussed in detail. Because all of the horizontal movements on the surface are rotation in internal space, the centrifugal torsion caused by earth rotation is the reason of crustal polar migration. Accordingly, polar migration causes the earth deformation, which is one of the cause of crustal movement and earthquake. Coriolis force caused by earth rotation is the reason that earth's loops and layers make differential rotation in gravitatve differentiation, and the differential rotation is the cause of the earth's rotation on decadal timescales and the long term variation of the obliquity and near diurnal free wobble.
In this paper, the astrogeodynamical effects on he earth's rotation are discussed in detail. Because all of the horizontal movements on the surface are rotation in internal space, the centrifugal torsion caused by earth rotation is the reason of crustal polar migration. Accordingly, polar migration causes the earth deformation, which is one of the cause of crustal movement and earthquake. Coriolis force caused by earth rotation is the reason that earth's loops and layers make differential rotation in gravitatve differentiation, and the differential rotation is the cause of the earth's rotation on decadal timescales and the long term variation of the obliquity and near diurnal free wobble.
引文
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[11] DickeyJO ,etal.TheOceaniccontributiontotheEarth’sseasonalangularmomentumbudget[J].GRLetters,1993,20(24):2953～2956.
[12] HideR .ThetopographytorqueonaboundingsurfaceofarotatinggravitatingfluidandexcitationbycoremotionsofdecadalfluctuationsintheEarth’srotation[J].GRLet ters,1993,22(8):961～964.
[13] BruceA .Buffett.Effectsofaheterogeneousmantleonthevelocityandmagneticfieldsatthetopofthecore[J].GeophysJInt.1996,125:303～317.
[14] 高布锡.核幔耦合所引起的黄赤交角长期变化[J].天文学报,1983,24(3):77～84.
[15] MathewsPW ,etal.Forcednutationsoftheearth:Influ enceofinnercoredynamics,1Theory[J].JGeophysRes.,1991,5(96):8219～8242.
[16] HerringTA ,etal.Geodesybyradiointerferometry:Stud iesoftheforcednutationoftheearth1.DataAnalysis[J].JGeophysRes,1986,91:4745～4754
[2] 虞南华,郑大伟.地球自转及其和地球物理现象的联系2地极移动[J].地球物理学进展,196,11(3):70～81.
[3] 马宗晋,高祥林,任金卫.现今全球构造特征及其动力学解释[J].第四纪研究,1992,(4):293～305.
[4] 杨学祥,陈殿友.地核的动力作用(J).地球物理学进展,1996,11(1):68～74.
[5] 杨学祥,王莉.地球自转、极移与地壳形变(J).地壳形变与地震,1995,15(2):74～82
[6] MansinhaL ,SmylieDE .EffectsofearthquakesontheChandlerwobbleandthesecularpoleshift(J).JGeophysRes.,1967,72:4731～4743.
[7] SmylieKE ,MansinhaL .Earthquakesandtheobservedmotionoftherotationpole[J].JGeophysRes.,1968,73:7661～7673.
[8] R櫣digerG.DifferentialRotationandStellerConvectionSunandSolar typeStars[R ].Academia,Verlog,Berling,1989.
[9] 高布锡,张江水.地球的较差转动极其天文地球动力学效应[R].中国科学院测地所,2000.
[10] HideR ,etal.Atmosphericangularmomentumfluctuationsduring1979～1988,simulatedbyglobalcirculationmodels[J].JGR ,1997,102(14):16423～16438.
[11] DickeyJO ,etal.TheOceaniccontributiontotheEarth’sseasonalangularmomentumbudget[J].GRLetters,1993,20(24):2953～2956.
[12] HideR .ThetopographytorqueonaboundingsurfaceofarotatinggravitatingfluidandexcitationbycoremotionsofdecadalfluctuationsintheEarth’srotation[J].GRLet ters,1993,22(8):961～964.
[13] BruceA .Buffett.Effectsofaheterogeneousmantleonthevelocityandmagneticfieldsatthetopofthecore[J].GeophysJInt.1996,125:303～317.
[14] 高布锡.核幔耦合所引起的黄赤交角长期变化[J].天文学报,1983,24(3):77～84.
[15] MathewsPW ,etal.Forcednutationsoftheearth:Influ enceofinnercoredynamics,1Theory[J].JGeophysRes.,1991,5(96):8219～8242.
[16] HerringTA ,etal.Geodesybyradiointerferometry:Stud iesoftheforcednutationoftheearth1.DataAnalysis[J].JGeophysRes,1986,91:4745～4754
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