Correction of ADCP compass errors resulting from iron in the instrument’s vicinity
Iron in the vicinity of compasses results in magnetic deviations. ADCPs mounted on steel buoyancy devices and deployed on seven moorings on the East Greenland outer shelf and upper slope from 2007 to 2008 suffered from severe magnetic deviations of $>$90$^\circ$ rendering the ADCP data useless wi...
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American Meteorological Society
2015
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Online Access: | https://epic.awi.de/id/eprint/37345/ https://epic.awi.de/id/eprint/37345/2/vonAppen_JTech_2015.pdf https://hdl.handle.net/10013/epic.45674 https://hdl.handle.net/10013/epic.45674.d002 |
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ftawi:oai:epic.awi.de:37345 2023-05-15T16:03:46+02:00 Correction of ADCP compass errors resulting from iron in the instrument’s vicinity von Appen, Wilken-Jon 2015-03 application/pdf https://epic.awi.de/id/eprint/37345/ https://epic.awi.de/id/eprint/37345/2/vonAppen_JTech_2015.pdf https://hdl.handle.net/10013/epic.45674 https://hdl.handle.net/10013/epic.45674.d002 unknown American Meteorological Society https://epic.awi.de/id/eprint/37345/2/vonAppen_JTech_2015.pdf https://hdl.handle.net/10013/epic.45674.d002 von Appen, W. J. orcid:0000-0002-7200-0099 (2015) Correction of ADCP compass errors resulting from iron in the instrument’s vicinity , Journal of Atmospheric and Oceanic Technology, 32 , pp. 591-602 . doi:10.1175/JTECH-D-14-00043.1 <https://doi.org/10.1175/JTECH-D-14-00043.1> , hdl:10013/epic.45674 EPIC3Journal of Atmospheric and Oceanic Technology, American Meteorological Society, 32, pp. 591-602 Article isiRev 2015 ftawi https://doi.org/10.1175/JTECH-D-14-00043.1 2021-12-24T15:40:14Z Iron in the vicinity of compasses results in magnetic deviations. ADCPs mounted on steel buoyancy devices and deployed on seven moorings on the East Greenland outer shelf and upper slope from 2007 to 2008 suffered from severe magnetic deviations of $>$90$^\circ$ rendering the ADCP data useless without a compass correction. The effects on the measured velocities, which may also be present in other oceanic velocity measurements, are explained. On each of the moorings, velocity measurements from a different instrument which was assumed not to be affected by magnetic deviation are overlapping in space and time with the compromised ones. A method is described to determine the magnetic compass deviation from the compromised and uncompromised velocity measurements and the compromised compass headings. The method depends on the assumption that at least one instrument per mooring is not compromised. With this method, the magnetic deviation as well as the originally compromised velocity records can be corrected. The method is described in detail and a MATLAB(R) script implementing the method is supplied. The success of the method is demonstrated for one of the moorings. Article in Journal/Newspaper East Greenland Greenland Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Greenland Journal of Atmospheric and Oceanic Technology 32 3 591 602 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Iron in the vicinity of compasses results in magnetic deviations. ADCPs mounted on steel buoyancy devices and deployed on seven moorings on the East Greenland outer shelf and upper slope from 2007 to 2008 suffered from severe magnetic deviations of $>$90$^\circ$ rendering the ADCP data useless without a compass correction. The effects on the measured velocities, which may also be present in other oceanic velocity measurements, are explained. On each of the moorings, velocity measurements from a different instrument which was assumed not to be affected by magnetic deviation are overlapping in space and time with the compromised ones. A method is described to determine the magnetic compass deviation from the compromised and uncompromised velocity measurements and the compromised compass headings. The method depends on the assumption that at least one instrument per mooring is not compromised. With this method, the magnetic deviation as well as the originally compromised velocity records can be corrected. The method is described in detail and a MATLAB(R) script implementing the method is supplied. The success of the method is demonstrated for one of the moorings. |
format |
Article in Journal/Newspaper |
author |
von Appen, Wilken-Jon |
spellingShingle |
von Appen, Wilken-Jon Correction of ADCP compass errors resulting from iron in the instrument’s vicinity |
author_facet |
von Appen, Wilken-Jon |
author_sort |
von Appen, Wilken-Jon |
title |
Correction of ADCP compass errors resulting from iron in the instrument’s vicinity |
title_short |
Correction of ADCP compass errors resulting from iron in the instrument’s vicinity |
title_full |
Correction of ADCP compass errors resulting from iron in the instrument’s vicinity |
title_fullStr |
Correction of ADCP compass errors resulting from iron in the instrument’s vicinity |
title_full_unstemmed |
Correction of ADCP compass errors resulting from iron in the instrument’s vicinity |
title_sort |
correction of adcp compass errors resulting from iron in the instrument’s vicinity |
publisher |
American Meteorological Society |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/37345/ https://epic.awi.de/id/eprint/37345/2/vonAppen_JTech_2015.pdf https://hdl.handle.net/10013/epic.45674 https://hdl.handle.net/10013/epic.45674.d002 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_source |
EPIC3Journal of Atmospheric and Oceanic Technology, American Meteorological Society, 32, pp. 591-602 |
op_relation |
https://epic.awi.de/id/eprint/37345/2/vonAppen_JTech_2015.pdf https://hdl.handle.net/10013/epic.45674.d002 von Appen, W. J. orcid:0000-0002-7200-0099 (2015) Correction of ADCP compass errors resulting from iron in the instrument’s vicinity , Journal of Atmospheric and Oceanic Technology, 32 , pp. 591-602 . doi:10.1175/JTECH-D-14-00043.1 <https://doi.org/10.1175/JTECH-D-14-00043.1> , hdl:10013/epic.45674 |
op_doi |
https://doi.org/10.1175/JTECH-D-14-00043.1 |
container_title |
Journal of Atmospheric and Oceanic Technology |
container_volume |
32 |
container_issue |
3 |
container_start_page |
591 |
op_container_end_page |
602 |
_version_ |
1766399461453463552 |