There are two dominating approaches of modeling the marine gravity field based on satellite altimetry observations. In this study, the marine gravity field is determined in four selected areas (Northwestern Atlantic, Hawaii ocean area, Mariana Trench area, and Aegean Sea) by using exact same input datasets but different methods which are based on sea surface height (SSH) and sea surface slope (SSS), respectively. The impact of the methodology is evaluated by conducting validations with shipborne gravity observation. The CryoSat-2, Jason-1/2, and SARAL/Altika geodetic mission data (similarly 3-year-long time series) are firstly retracked by the two-pass retracker. After that, the obtained SSHs are used for the derivation of geoid undulations and vertical deflections, and then for the resulting marine gravity field separately. The validation results indicate that the SSH-based method has advantages in robustly estimating marine gravity anomalies near the coastal zone. The SSS-based method has advantages over regions with intermedium ocean depths (2000–4000 m) where seamounts and ridges are found, but obvious disadvantages when the ocean currents flow along the north–south direction (e.g., western boundary currents) or the topography features north–south directional trenches. In the deep ocean where the seafloor topography is plain and smooth, the two methods have similar accuracy.

有两种基于卫星测高观测对海洋重力场进行建模的主要方法。在本研究中，通过使用完全相同的输入数据集，但基于海面高度 (SSH) 的不同方法，确定了四个选定区域（西北大西洋、夏威夷海域、马里亚纳海沟区域和爱琴海）的海洋重力场。海面坡度（SSS）。该方法的影响是通过对船载重力观测进行验证来评估的。CryoSat-2、Jason-1/2 和 SARAL/Altika 大地测量任务数据（类似 3 年的时间序列）首先由两遍重跟踪器重跟踪。之后，得到的 SSH 用于推导大地水准面起伏和垂直偏转，然后分别用于产生的海洋重力场。验证结果表明，基于SSH的方法在稳健估计沿海地区海洋重力异常方面具有优势。基于SSS的方法相对于中海深（2000-4000 m）的海山和海脊区域具有优势，但在洋流沿南北方向（例如西边界流）或地形流动时明显劣势具有南北向的沟渠。在海底地形平坦平坦的深海中，两种方法的精度相近。但当洋流沿南北方向流动（如西部边界流）或地形特征为南北向海沟时，缺点明显。在海底地形平坦平坦的深海中，两种方法的精度相近。但当洋流沿南北方向流动（如西部边界流）或地形特征为南北向海沟时，缺点明显。在海底地形平坦平坦的深海中，两种方法的精度相近。