Earth Planets Space, Vol. 62 (No. 10), pp. 829-832, 2010
Jürgen Matzka1, Thorkild M. Rasmussen2, Arne V. Olesen1, Jens Emil Nielsen1, Rene Forsberg1, Nils Olsen1, John Halpenny3, and Jacob Verhoef3
1DTU Space, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
2GEUS, Ø. Voldgade 10, 1350 Copenhagen, Denmark
3NRCan, 580 Booth, Ottawa, ON K1A 0E4, Canada
(Received May 13, 2010; Revised June 25, 2010; Accepted July 1, 2010; Online published December 31, 2010)
We present a preliminary analysis of more than 50,000 km of aeromagnetic survey lines flown in the Arctic Ocean, acquired in 2009 with an optically pumped scalar magnetometer as part of the airborne geophysical survey 'LOMGRAV'. From the observations we removed main and magnetospheric fields as given by the CHAOS-3 field model (Olsen et al., 2010) and remaining external fields as monitored by the Canadian magnetic observatory Alert. The reduced data were levelled based on cross-over differences at line intersections. Finally, a grid was computed, upward continued by 3500 m and compared with the EMAG2 grid (Maus et al., 2009), showing a good general agreement but also areas with systematic differences. The obtained data are expected to be part of the next version of the World Digital Magnetic Anomaly Map (WDMAM).
Key words: Aeromagnetic survey, Arctic Ocean, WDMAM, Greenland, Ellesmere Island.