An alternative method to improve gravity field models by incorporating GOCE gradient data

Wan, Xiaoqiao; Ran, Jiangjun

doi:10.15446/esrj.v22n3.64666

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…Hence, it is possible to derive higher accurate marine gravity field using HY-2A observations, which should be studied further in the future. In addition, the derived gravity anomaly (see Figure 14a) shows abundant information on geological structure, such as oceanic trench, which also should be studied further [33], and should be combined with other gravity products from gravity satellites [34][35][36].…”

Section: Inversion Of Gravity Anomaliesmentioning

confidence: 99%

Vertical Deflections and Gravity Disturbances Derived from HY-2A Data

et al. 2020

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The first Chinese altimetry satellite, Haiyang-2A (HY-2A), which was launched in 2011, has provided a large amount of sea surface heights which can be used to derive marine gravity field. This paper derived the vertical deflections and gravity disturbances using HY-2A observations for the major area of the whole Earth’s ocean from 60°S and 60°N. The results showed that the standard deviations (STD) of vertical deflections were 1.1 s and 3.5 s for the north component and the east component between HY-2A’s observations and those from EGM2008 and EIGEN-6C4, respectively. This indicates the accuracy of the east component was poorer than that of the north component. In order to clearly demonstrate contribution of HY-2A’s observations to gravity disturbances, reference models and the commonly used remove-restore method were not adopted in this study. Therefore, the results can be seen as ‘pure’ signals from HY-2A. Assuming the values from EGM2008 were the true values, the accuracy of the gravity disturbances was about −1.1 mGal in terms of mean value of the errors and 8.0 mGal in terms of the STD. This shows systematic errors if only HY-2A observations were used. An index of STD showed that the accuracy of HY-2A was close to the theoretical accuracy according to the vertical deflection products. To verify whether the systematic errors of gravity field were from the long wavelengths, the long-wavelength parts of HY-2A’s gravity disturbance with wavelengths larger than 500 km were replaced by those from EGM2008. By comparing with ‘pure’ HY-2A version of gravity disturbance, the accuracy of the new version products was improved largely. The systematic errors no longer existed and the error STD was reduced to 6.1 mGal.

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Section: Inversion Of Gravity Anomaliesmentioning

confidence: 99%

Vertical Deflections and Gravity Disturbances Derived from HY-2A Data

et al. 2020

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“…However, collecting gravity data over an extensive marine area is expensive and inefficient. After decades of development, resolving gravity anomalies from the satellite altimetry data has gradually become the mainstream approach for obtaining marine gravity anomalies [3][4][5][6]. For this method, the satellite altimetry data are processed to obtain the sea surface height [3,7,8].…”

Section: Introductionmentioning

confidence: 99%

A Fast Method for Calculation of Marine Gravity Anomaly

et al. 2021

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Gravity data have been playing an important role in marine exploration and research. However, obtaining gravity data over an extensive marine area is expensive and inefficient. In reality, marine gravity anomalies are usually calculated from satellite altimetry data. Over the years, numerous methods have been presented for achieving this purpose, most of which are time-consuming due to the integral calculation over a global region and the singularity problem. This paper proposes a fast method for the calculation of marine gravity anomalies. The proposed method introduces a novel scheme to solve the singularity problem and implements the parallel technique based on a graphics processing unit (GPU) for fast calculation. The details for the implementation of the proposed method are described, and it is tested using the geoid height undulation from the Earth Gravitational Model 2008 (EGM2008). The accuracy of the presented method is evaluated by comparing it with marine shipboard gravity data. Its efficiency is demonstrated through comparison with the conventional sequential method. The tests demonstrate that the proposed method can be employed for accurately calculating marine gravity anomalies and provides an advantage on computational efficiency.

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