Accurate Ocean Current Observation near the magnetic dip pole: compass error estimation

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  • Kikuchi Takashi
    Ocean Observation and Research Department, Japan Marine Science and Technology Center
  • Uno Hirokatsu
    Marine Works Japan Ltd.
  • Hosono Masuo
    Ocean Observation and Research Department, Japan Marine Science and Technology Center
  • Hatakeyama Kiyoshi
    Ocean Observation and Research Department, Japan Marine Science and Technology Center

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Other Title
  • 地磁気極近くでの海流観測: コンパスの問題について
  • チジキキョク チカク デ ノ カイリュウ カンソク コンパス ノ モンダイ ニ ツイテ

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Accurate ocean current measurements near the magnetic dip pole have been carried out in the multi-year ice area of the central Arctic Ocean using ice-drifting buoy, J -CAD (JAMSTEC Compact Arctic Drifter). Because of weakness of the magnetic direction reference near the magnetic dip pole, we need to look more carefully into the compass malfunction in order to obtain accurate ocean current. Using the observational data from J-CAD 6 in 2003, we attempted heading data comparisons of attached compasses with azimuthal data calculated from GPS buoys. Results show that Watson Compass, which is 3-dimensional magneto-metric compass attached on the same cage of WorkHorse 300 kHz ADCP (WH-ADCP), can measure the correct heading with an accuracy of 4 degree over the entire J-CAD 6 trajectory. On the other hand, we found that WH-ADCP compass illustrated good results of heading measurements under the condition which the horizontal magnetic intensity is higher than 3000 nT. Also, we investigated a non-linear response of WH-ADCP compass from a comparison with Watson Compass, which are attached on J-CAD 4 in 2002. A non-linearity response of WH-ADCP compass was found with amplitude of ~20 degrees under the condition which the horizontal magnetic intensity is higher than 3000 nT. However, we can conclude that the heading data from WH-ADCP would be useful with an accuracy of 5 degrees after understanding the non-linear response of each compass.

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