地球自转十年尺度波动与核幔耦合的可能机制
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摘要
简要介绍了地球自转变化的一般规律和可能的地球物理激发因素、十年尺度波动与核幔边界耦合之间的联系，以及几种可能的核幔耦合机制。强调了地震波探测手段对于获取地球内部信息的重要性，同时指出将空间大地测量、重力测量和地磁观测与地球物理学方面的理论与模型研究相结合，对于最终分析和确认地球自转变化中的各种信息及其激发因素是十分重要的。
In this paper, the general characteristics of the Earth rotation variation and the possible geophysical excitation sources are briefly reviewed. The relations between the decadal fluctuations of the Earth rotation and the core mantle coupling is highlighted. Several possible mechanisms of the core mantle coupling are introduced. The detection of seismic waves is essential to our understanding of the Earth's interior. In order to study and finally affirm various phenomena and the corresponding geophysical excitation factors, it is very important to comprehensively analyze the information from space geodesy, gravitational measurements and paleogeomagnetic records as well as results from geophysical studies of theories and models.
In this paper, the general characteristics of the Earth rotation variation and the possible geophysical excitation sources are briefly reviewed. The relations between the decadal fluctuations of the Earth rotation and the core mantle coupling is highlighted. Several possible mechanisms of the core mantle coupling are introduced. The detection of seismic waves is essential to our understanding of the Earth's interior. In order to study and finally affirm various phenomena and the corresponding geophysical excitation factors, it is very important to comprehensively analyze the information from space geodesy, gravitational measurements and paleogeomagnetic records as well as results from geophysical studies of theories and models.
引文
1HideR，BoggsDH，DickeyJO，etal．Topographiccore－mantlecouplingandpolarmotionondecadaltime－scales．GeophysJInt，1996，125：599－607．2WilsonCR．Contributionsofwatermassredistributiontopolarmotionexcitation．In：SmithDE，TourcotteDL，eds．Contributionsofspacegeodesytogeodynamics：Earthdynamics．AmGeophysUn，GeodynamicsSer24，Wash－ingtonDC，1993．77－82．3DickeyJO，EubanksTM，HideR．InterannualanddecadefluctuationsintheEarth＇sRotation．In：McCarthyDD，CarterWE，eds．VariationsinEarthRotation．GeophysicalMonograph59，Agu，1990．157－161．4HideR．Thetopographictorqueontheboundingsurfaceofarotatinggravitatingfluidandtheexcitationbycoremo－tionsofdecadalfluctuationsintheEarth＇srotation．GeophysResLett，1995，22：961－964；3563－3565．5HideR，DickeyJO．Earth＇svariablerotation．Science，1991，253：629－637．6VoorhiesCV．Couplinganinviscidcoretoanelectricalyinsulatingmantle．JGeomagGeoelectr，1991，43：131－156．7Greff－LefftzM，LegrosH．Core－mantlecouplingandpolarmotion．PhysEarthPlanetInter，1995，91：273－283．8PaulusM，StixM．Electromagneticcore－mantlecoupling．In：CazenaveA，ReidelD，Dordrecht，eds．EarthRota－tion：SolvedandUnsolverProblems．1986．259－267．9HideR．InteractionoftheEarth＇sliquidcoreandsolidmantle．Nature，1969，222：1055－1056．10MalinSRC，HideH．Bumpsonthecore－mantleboundary：geomagneticandgravitationalevidencerevisited．PhilTransRSocLon，1982，A306：281－289．11SongXD，RichardsPG．SeismologicalevidencefordiferentialrotationoftheEarth＇sinnercore．Nature，1996，382：221－224．12ZhangCZ，XiaYF．RemarksondynamicalelipticityattheEarth＇score－mantleboundary．Earth，MoonandPlan－ets，1994，65：269－276．13HerringTA，BufetBA，MathewsPM，etal．ForcednutationsoftheEarth：Influenceofinnercoredynamics3．Verylongbaselineinterferometrydataanalysis．JGeophysRes，1991，96：8259－8274．14MathewsPM，ShapiroII．Estimationofouter－andinner－coreparametersfromnutationandtidaldata．In：Geo－physicsandtheEnvironment．AbstractsWeekB，IUGGXXIGeneralAssembly，Boulder，Colorado，July2－14，1995．B22．15deVriesD，WahrJM．TheefectsofthesolidinnercoreandnonhydrostaticstructureontheEarth＇sforcednuta－tionsandEarthtides．JGeophysRes，1991，96：8275－829
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