中文摘要：

针对空间重力异常向下延拓方法不适用于海面重力异常向下延拓的问题,根据珀雷原理求地球表层内部重力的方法、海水密度及海底地形的特征,提出了两种海面重力异常向下延拓的算法.数值实验结果验证了新方法的有效性.

英文摘要：

For solving the problems that downward continuation of the space gravity anomaly can not be used in downward continuation of sea surface gravity anomaly, on the basis of Prey principle used to compute gravity in the surface-layer of the earth, and with considering the density of sea water and sea bottom topography, two new methods are proposed. The experimental results show that the new methods are valid and effective.