Seafloor Density Contrast Derived From Gravity and Shipborne Depth Observations: A Case Study in a Local Area of Atlantic Ocean

Wan, Xiaoyun1; Han, Weipeng2; Ran, Jiangjun3; Ma, Wenjie1; Annan, Richard Fiifi1; Li, Bing4

2021-04-30

10.3389/feart.2021.668863

FRONTIERS IN EARTH SCIENCE   影响因子和分区

2296-6463

Marine gravity data from altimetry satellites are often used to derive bathymetry; however, the seafloor density contrast must be known. Therefore, if the ocean water depths are known, the density contrast can be derived. This study experimented the total least squares algorithm to derive seafloor density contrast using satellite derived gravity and shipborne depth observations. Numerical tests are conducted in a local area of the Atlantic Ocean, i.e., 34 degrees similar to 32 degrees W, 3.5 degrees similar to 4.5 degrees N, and the derived results are compared with CRUST1.0 values. The results show that large differences exist if the gravity and shipborne depth data are used directly, with mean difference exceeding 0.4 g/cm(3). However, with a band-pass filtering applied to the gravity and shipborne depths to ensure a high correlation between the two data sets, the differences between the derived results and those of CRUST1.0 are reduced largely and the mean difference is smaller than 0.12 g/cm(3). Since the spatial resolution of CRUST1.0 is not high and in many ocean areas the shipborne depths and gravity anomalies are much denser, the method of this study can be an alternative method for providing seafloor density variation information.

density contrast seafloor bathymetry gravity anomaly total least squares

SCI

英语

其他

National Natural Science Foundation of China[41674026,42074017] ; Fundamental Research Funds for the Central Universities[2652018027] ; Open Research Fund of Qian Xuesen Laboratory of Space Technology, CAST[GZZKFJJ2020006] ; China Geological Survey[20191006]

Geology

Geosciences, Multidisciplinary

WOS:000650054300001

FRONTIERS MEDIA SA

Web of Science

1.China Univ Geosci Beijing, Sch Land Sci & Technol, Beijing, Peoples R China
2.Changan Univ, Coll Geol Engn & Surveying, Xian, Peoples R China
3.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
4.Minist Nat Resources, Inst Oceanog 1, Qingdao, Peoples R China

Wan, Xiaoyun,Han, Weipeng,Ran, Jiangjun,et al. Seafloor Density Contrast Derived From Gravity and Shipborne Depth Observations: A Case Study in a Local Area of Atlantic Ocean[J]. FRONTIERS IN EARTH SCIENCE,2021,9.

Wan, Xiaoyun,Han, Weipeng,Ran, Jiangjun,Ma, Wenjie,Annan, Richard Fiifi,&Li, Bing.(2021).Seafloor Density Contrast Derived From Gravity and Shipborne Depth Observations: A Case Study in a Local Area of Atlantic Ocean.FRONTIERS IN EARTH SCIENCE,9.

Wan, Xiaoyun,et al."Seafloor Density Contrast Derived From Gravity and Shipborne Depth Observations: A Case Study in a Local Area of Atlantic Ocean".FRONTIERS IN EARTH SCIENCE 9(2021).