北美及澳大利亚先后于2005年、2007年修订重力归算标准并重新改算国家重力数据库数据,以提高重力数据精确度与准确度,扩大数据应用领域和用途范围.本文参考北美及澳大利亚的重力归算新标准,对比我国区域重力调查规范(DZ/T 0082-2006)中的陆地重力校正方法,审视海洋区域重力调查执行的海洋地质地球物理调查规范(GB/T 12763.8-2007)中的海洋重力校正方法,从重力校正理论基础入手,对海洋常规重力校正的传统近似方法及精确计算公式作了回顾和总结,并就GB/T 12763.8-2007中的船载重力校正有关条文,提出了相应修改建议,以加速我国在该领域的研究,供商榷.
North America and Australia revised gravity reduction standards respectively in 2005,2007 and their national gravity databases were also revised,in order to improve the precision,accuracy,coverage and versatility of gravity data.From the base of gravity correction theory,this paper reviews and summarizes conventional approximate methods and high-precision computing formulas for routine marine gravity corrections.North American and Australian new standards for reducing gravity data are referenced.Land and marine gravity correction methods, which have been adopted in the regional gravity survey specification(DZ/T0082-2006)and in the marine geology and geophysics survey specification(GB/T 12763.8-2007),are compared.In the end,suggestions are put forward for the revision of shipborne gravity correction provisions in GB/T 12763.8-2007.