利用不同重力场模型(EGM2008和EGM96)和不同海面高模型(CLS01、DNSC08、WHU2009和CNES_CLS10),分别确定无潮汐和平均潮汐系统下的全球平均海面位常数,通过海面地形改正后,平均位常数分别为62 636 858.333 3 m2s-2和62 636 858.260 6 m2s-2,计算结果与EGM2008使用的水准椭球正常位相差小于1.40m2s-2,反算求解海面地形平均值表明结果正确可靠.%The geoidal geopotential W0 was determined on the basis of global gravity model ( EGM2008 and EGM96) and global mean sea surface height model (CLS01, DNSC08, WHU2009 and CNES_CLS10). If the sea surface topography correction was applied to the surface height, the geoidal geopotential values 62 636 858. 333 3 m2s-2 and 62 636 858. 260 6 m2s-2 were derived with a difference less than 1. 40 m2s-2 compared to the normal level ellipsoid geopotential within free tide and mean tide system respectively. The mean sea surface topography computed based on this W0 shows that the results are reliable.
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