联合多种测高资料确定西太平洋海域2′×2′重力梯度

Determination of gravity gradients in the Western Pacific Ocean by combinating multi-altimeter data

从地球重力场基本理论出发,导出了大地水准面上局部切平面坐标下的重力梯度矢量水平分量和垂直分量的计算公式,利用由多颗测高卫星联合反演的2'×2'海洋重力异常和垂线偏差资料,计算了西太平洋海域2'×2'重力梯度矢量水平分量和垂直分量.将计算的重力垂直梯度和现有资料进行比较,标准差为9.99E,并对重力梯度的空间分布特征进行了初步分析.

On the basis of the fundamental principle of the earth gravity field, we derive the expressions of horizontal and vertical gradients in the local tagent plane coordinates system from geoid. According to gravity anomalies and vertical deviations gridded in 2′×2′size by combinating multi-altimeter data, we have ealcuated horizontal and vertical gradient with the resolution of 2′×2′ in the western Pacific area. The results of the gravity vertical gradient are compared with existing data, and the standard deviation is 9. 99E. In addition, some analyses and discussions about the distribution of gravity gradients are made.