摘要
探讨了利用地球重力场模型计算扰动重力垂直梯度的理论方法,介绍了高精度地球重力场模型和最新的EGM2008模型,并利用EGM2008模型的360阶和720阶完全规格化地球位系数,分别计算了西太平洋区域和全球范围的扰动重力垂直梯度。从绘制的计算结果分布图可以看出,扰动重力垂直梯度能够清晰反映并显示地球地质构造的变化特征与陆地边界轮廓。统计分析表明,随着位系数截断阶次从360阶增至720阶,计算结果的变化较为明显,均值接近于零,其数值分布近似服从正态分布。
Basic theory and method of computing vertical gradient of gravity disturbance using earth gravity field model are discussed at first, then high precision earth gravity field model and the latest model EGM2008 are introduced. Vertical gradient of gravity disturbance of western Pacific Ocean and global region are computed using 360 and 720 degree fully normalized earth geopotential coefficients of EGM2008. Distribution graphics of results show that the earth＇ s geological structure is revealed and terrestrial borderline is reflected by vertical gradient of gravity disturbance. Statistical analysis show that results vary with the geopotential truncation coefficients degree＇ s increase from 360 to 720 obviously, with both means are close to zero and numerical value conformed to normal distribution approximately.
出处
《海洋测绘》
2013年第2期9-12,共4页
Hydrographic Surveying and Charting
基金
国家自然科学基金项目(40904018
61203193)
973计划项目(2012CB719902)
关键词
扰动重力垂直梯度
重力场模型
EGM2008
位系数
gravity vertical gradient disturbance
gravity field model
EGM2008
geopotential coefficients
