Global High-Resolution Marine Gravity Field Product Fused from Altimetry-Derived Gravity and Shipborne Gravity (V1)
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摘要: 基于西太平洋海域JAMSTEC局部高密度船测重力建立卫星测高重力模型精度与SRTM15v2.4水深的对应关系，然后对国际上最具代表性的两大测高重力场系列模型的新版本DTU21和SIOv32.1全球加权融合并对极地区域特殊处理生成全球高分辨率海洋重力场融合产品FUSION_V1.0。该产品为全球1'×1' 网格重力异常，覆盖南北纬90度，经度从0至360度，包含3个变量，其中变量lon表示经度，单位为度；变量lat表示纬度，单位为度；变量grav表示二维重力异常网格，单位为毫伽。该产品将为我国自主的地球重力场模型构建提供数据支撑，有望成为下一代更高分辨率地球重力场模型的重要组成部分。
Abstract: Based on the JAMSTEC local high-density ship gravity measurement in the western Pacific Ocean, the correspondence between the accuracy of the satellite altimetry-derived marine gravity model and water depth from SRTM15v2.4 model was established. Then, DTU21 and SIOv32.1, the new versions of the two most representative gravity field series models derived from satellite altimetry, were globally weighted fusion, and the special treatment in the polar region was used to generate a global high-resolution marine gravity field fusion product FUSION_V1.0. The product is a global gravity anomaly with 1'×1' grid, covering 90 degrees of north-south latitude, longitude from 0 to 360 degrees. This product contains three variables, where the variable lon represents longitude in degrees; The variable lat represents latitude in degrees; The variable grav represents a two-dimensional gravity anomaly grid, measured in mGal. This product is expected to become an important component of the next generation of higher-resolution Earth Gravitational Model.
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Key words:
- Marine gravity field /
- satellite altimeter /
- multi-source fusion /
- shipborne gravity /
- water depth
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