Benchmark forward gravity schemes: the gravity field of a realistic lithosphere model WINTERC-G

0557403 - ASÚ 2023 RIV DE eng J - Journal Article
Root, B. - Sebera, Josef - Szwillus, W. - Thieulot, C. - Martinec, Z. - Fullea, J.
Benchmark forward gravity schemes: the gravity field of a realistic lithosphere model WINTERC-G.
Solid Earth. Roč. 13, č. 5 (2022), s. 849-873. ISSN 1869-9510. E-ISSN 1869-9529
Institutional support: RVO:67985815
Keywords : gravity * benchmark * lithosphere
OECD category: Physical geography
Impact factor: 3.4, year: 2022
Method of publishing: Limited access
https://doi.org/10.5194/se-13-849-2022

Several alternative gravity forward modelling methodologies and associated numerical codes with their own advantages and limitations are available for the solid Earth community. With upcoming state-of-the-art lithosphere density models and accurate global gravity field data sets, it is vital to understand the opportunities and limitations of the various approaches. In this paper, we discuss the four widely used techniques: global spherical harmonics (GSH), tesseroid integration ( LESS), triangle integration (TRI), and hexahedral integration (HEX). A constant density shell benchmark shows that all four codes can produce similar precise gravitational potential fields. Two additional shell tests were conducted with more complicated density structures: laterally varying density structures and a crust- mantle interface density. The differences between the four codes were all below 1.5 % of the modelled gravity signal suitable for reproducing satellite-acquired gravity data. TESS and GSH produced the most similar potential fields (< 0.3 %).
Permanent Link: http://hdl.handle.net/11104/0331652