Comparison of global geomagnetic field models and evaluation using marine datasets in the north-eastern Atlantic Ocean and western Mediterranean Sea

Earth, Planets and Space

Table 3 Differences in intensity values of the anomaly field (ANO) in nT estimated from HDGM2016 up to SH degree 720, EMAG2v3 and WDMAM anomaly grids and marine datasets gathered by area of interest

Area of interest	Model
Area of interest	HDGM2016^a 01/01/2010 ANO/720 0.5°	HDGM2016^a 01/01/2015 ANO/720 0.5°	EMAG2v3^a 0.5°	WDMAM^a 0.5°	EMAG2v3^b 2′	WDMAM^b 3′
NEAWM area (i.e. full dataset)	− 1.50 ± 65.87	− 5.40 ± 65.71	− 5.75 ± 67.33	1.01 ± 81.44	− 5.48 ± 89.14	− 0.58 ± 69.41
Mid-Atl. ridge 20–45°N	− 5.09 ± 88.61	− 9.11 ± 88.69	− 13.12 ± 91.11	− 8.27 ± 118.65	− 8.74 ± 132.35	− 2.59 ± 101.25
Canarian Isl. to offshore west Portugal	− 12.99 ± 62.96	− 15.73 ± 62.65	− 13.34 ± 59.97	− 5.67 ± 62.04	− 13.24 ± 55.94	− 7.66 ± 42.79
Bay of Biscay	− 0.50 ± 37.81	− 6.42 ± 37.87	0.72 ± 37.86	6.52 ± 43.02	2.14 ± 36.41	3.20 ± 34.32
English Channel to North Sea	18.17 ± 36.05	11.60 ± 36.05	8.65 ± 32.44	9.52 ± 35.09	2.73 ± 60.45	− 1.37 ± 57.19
W. Mediterranean Sea	2.01 ± 42.48	− 1.03 ± 42.39	1.00 ± 49.22	12.49 ± 50.51	− 0.49 ± 49.47	7.03 ± 37.75

Marine data are processed and filtered^a or only processed^b to give spectral content comparable to that of the models