Regional Validation and Combination of GOCE Gravity Field Models and Terrestrial Data

AbstractThe present study aims at the validation of global gravity field models through numerical investigation in gravity field functionals based on spherical harmonic synthesis of the geopotential models and the analysis of terrestrial data. We examine gravity models produced according to the latest approaches for gravity field recovery based on the principles of the Gravity field and steadystate Ocean Circulation Explorer (GOCE) and Gravity Recovery And Climate Experiment (GRACE) satellite missions. Furthermore, we evaluate the overall spectrum of the ultra-high degree combined gravity models EGM2008 and EIGEN-6C3stat. The terrestrial data consist of gravity and collocated GPS/levelling data in the overall Hellenic region. The software presented here implements the algorithm of spherical harmonic synthesis in a degree-wise cumulative sense. This approach may quantify the bandlimited performance of the individual models by monitoring the degree-wise computed functionals against the terrestrial data. The degree-wise analysis performed yields insight in the short-wavelengths of the Earth gravity field as these are expressed by the high degree harmonics.

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Accuracy of the earth's gravity field models

Physics of The Earth and Planetary Interiors ◽

10.1016/0031-9201(83)90100-0 ◽

1983 ◽

Vol 31 (3) ◽

pp. 231-240 ◽

Cited By ~ 1

Author(s):

M.A. Khan

Keyword(s):

Gravity Field ◽

Earth’S Gravity Field ◽

Gravity Field Models

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Orbit determination of the SELENE satellites using multi-satellite data types and evaluation of SELENE gravity field models

Journal of Geodesy ◽

10.1007/s00190-011-0446-2 ◽

2011 ◽

Vol 85 (8) ◽

pp. 487-504 ◽

Cited By ~ 19

Author(s):

S. Goossens ◽

K. Matsumoto ◽

D. D. Rowlands ◽

F. G. Lemoine ◽

H. Noda ◽

...

Keyword(s):

Gravity Field ◽

Satellite Data ◽

Orbit Determination ◽

Data Types ◽

Gravity Field Models

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Preliminary monthly gravity field models from kinematic orbits of SWARM Satellites

10.5194/egusphere-egu21-9839 ◽

2021 ◽

Author(s):

Xingfu Zhang ◽

Qiujie Chen ◽

Yunzhong Shen

Keyword(s):

Gravity Field ◽

Large Scale ◽

Earth System ◽

The Earth ◽

Swarm Satellites ◽

Variable Gravity ◽

Data Gap ◽

One Year ◽

Gravity Recovery ◽

Gravity Field Models

<p>&#160; &#160; &#160; Although the Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE FO) satellite missions play an important role in monitoring global mass changes within the Earth system, there is a data gap of about one year spanning July 2017 to May 2018, which leads to discontinuous gravity observations for monitoring global mass changes. As an alternative mission, the SWARM satellites can provide gravity observations to close this data gap. In this paper, we are dedicated to developing alternative monthly time-variable gravity field solutions from SWARM data. Using kinematic orbits of SWARM from ITSG for the period January 2015 to September 2020, we have generated a preliminary time series of monthly gravity field models named Tongji-Swarm2019 up to degree and order 60. The comparisons between Tongji-Swarm2019 and GRACE/GRACE-FO monthly solutions show that Tongji-Swarm2019 solutions agree with GRACE/GRACE-FO models in terms of large-scale mass change signals over amazon, Greenland and other regions. We can conclude that Tongji-Swarm2019 monthly gravity field models are able to close the gap between GRACE and GRACE FO.</p>

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