Modelling of electromagnetic signatures of global ocean circulation: physical approximations and numerical issues

Earth, Planets and Space

Table 1 Quick comparison of the EM induction solvers used in the study

Solver	Physics	Ocean layer	Sub-ocean layer	Domain	Discretization
Solver	Physics	Ocean layer	Sub-ocean layer	Domain	Lateral	Radial
ElmgTD	Full	3-D	Conductor or insulator	Time	SH	FE
X3DG	Full	3-D	Conductor or insulator	Freq	PWC	PWC
UTSM	UTSA	2-D thin sheet	Insulator	Time	FD+SH	–

UTSA unimodal thin-sheet approximation of Tyler et al. (1997) and Vivier et al. (2004) with insulating mantle and core, SH spherical harmonics, FE finite elements, PWC piece-wise constant representation, FD finite differences