摘要
Abstract
The marine gravity field is a crucial physical field of the Earth system,with shipborne and satellite altimetry-derived gravity data serving as the primary sources for its high-resolution modeling.However,shipborne gravity data is sparsely and unevenly distributed globally,while single altimetry-de-rived gravity models exhibit accuracy limitations or incomplete coverage in specific regions.This study utilized high-density shipborne gravity data from the Japan Agency for Marine-Earth Science and Tech-nology(JAMSTEC)in the western Pacific Ocean(120°E-170°E,0°-50°N).Based on the latest ver-sions of two major global altimetry-derived gravity field models,DTU21 and SIOv32.1,it establishes cor-relations between the gravity model errors verified by shipborne gravity and water depths from SRTM15v2.4 model.Through weighted fusion and special processing for polar regions,a global 1'×1'gridded marine gravity anomaly model,FUSION_V1.0,was generated.This model includes longitude,latitude,and gravity anomaly variables,covering the global ocean(90°S-90°N,180°W-180°E)and adopting the simplest and most widely used geographic coordinate system(i.e.,equiangular projection),stored in NetCDF format for compatibility with mainstream scientific software.This dataset can pro-vide high-quality foundational data for seafloor topography recovery,marine geophysical research,and related space science applications.关键词
海洋重力场/卫星测高/船测重力/多源融合/重力异常/水深/全球网格Key words
Marine gravity field/Satellite altimetry/Ship gravity/Multi-source fusion/Gravity anomaly/Water depth/Global grid分类
天文与地球科学
