地球重力场时变性的研究进展

Temporal Variation in the Gravity Field of the Earth

地球重力场是表征地球内部、表面或外部各点所受地球重力作用空间的物理属性.地球重力场不仅存在着空间变化而且存在着时间变化.从空间观测,地球重力场是地球系统质量分布的结果,质量在地球系统内的传输和变化将在地球重力场的变化中反映出来.重力场的时变有长期变化、季节性变化、不规则变化和其他多尺度的变化.本文主要介绍了时变的地球重力场领域近年来的研究进展,归纳和描述了引起地球重力场时变的主要因素.

Gravity field of the Earth is a physical property contributed by the gravity to state the space in, on and above the Earth. It exists variation not only on temporal scale but also on spatial scale. The Earth＇s gravity field observed from space is a consequence of the mass distribution within the Earth system. The Transport of mass within the Earth system will be reflected in the gravity field variation. The temporal variation of it has secular change, seasonal variation, irregular variation, and other scales variation. We mainly review the progress in researches on the temporally varying gravity field. The main reasons contributed to the gravity variation are classified and described respectively in the paper.