用逆Vening-Meinesz公式反演海洋重力场时积分半径的选择

OPTION OF INTEGRAL RADIUS IN INVERSION OF SEA GRAVITY WITH INVERSE VENING-MEINESZ FORMULA

海面高由大地水准面高和海面地形组成，稳态海面地形长波占优，因此在垂线偏差逆运算逆Vening—Meinesz公式中，选取比较小的积分可以抑制海面地形的长波误差，提高重力场元的计算精度。使用PALGrav1．0软件，利用卫星测高数据及船测重力数据，选取不同的积分半径计算了局部海洋重力场，并进行比较，证实30’～60’是最适合的积分半径。

Sea surface height（SSH）is composed of geoid undulation and sea surface topography（SST） SST focuses on long - wave,hence,in the inverse Vening - Meinesz formula,a smaller integral radius could reduce long-wave error from SST, and improve the accuracy of the gravity. Satellite altimetry data and shipping measured gravity data are used, marine gravity is calculated by different integral radius, and conclusion is that 30＇ - 60＇ is the most suitable integral radius.