利用现代大地测量数据研究青藏高原内部质量迁移过程

利用重力卫星GRACE/GOCE，绝对重力和GPS 数据以及地球内部物性参数和地表水系等资料，研究青藏高原动力学变化问题。目的是揭示在印度板块冲撞下青藏高原的动力学变化的科学信息，反映青藏高原动力学变化过程的几何与物理场的基本特征和机理。研究内容为：青藏高原上的冰雪融化/冰后期反弹和水系变化及其地球内部密度变化，热构造和粘滞构造对青藏高原动力学变化的影响规律和特征，青藏高原是否仍在隆起，地壳是否仍在增厚，莫霍面是否仍在下沉，以及这些变化对地球系统主要参数的影响，如重力场，大地水准面，海平面以及地球自转的变化等。主要技术途径是在青藏高原建立绝对重力剖面，每年进行重复观测，辅以GPS 测量；对GRACE、地表重力和GPS 数据进行处理分析、对各种物理因素进行建模和数值模拟研究。在青藏高原动力学研究上取得重要结果，提高地球科学研究水平，加深对自然环境及其变化规律理解和认识水平。

This project is to investigate the geodynamical changes of the Tibetan Plateau, using the geodetic data observed by gravity satellite GRACE/GOCE, absolute gravity and GPS, combined with inner material parameters and surface hydrological data. The aim is to obtain the scientific information of the geodynamical changes of the Plateau under the collision of the India plate, to reflect its basic geometrical and physical property and mechanism. The questions to be answered include: the hydrological and density changes caused by ice/snow melting and post-glacial adjustment, the effects of thermal structure and viscosity on the dynamical changes, is the Plateau still uplifting, is the crust still thickening, is the Moho-surface sinking, and the effects of those changes on the earth system, like gravity field, geoid, ocean surface and rotation of the earth. We will establish a gravity profile across the Tibetan Plateau, performing repeat gravity and GPS measurements, after simulation and corrections for varies geophysical effects, it is expected to obtain new knowledge on the geodynamical changes of the Plateau, and enhance our understanding on our natural environment.