Improving LADCP velocity with external heading, pitch, and roll
Author Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Atmospheric and Oceanic Technology 34 (2017): 1713-1721, doi:10.1175/JTEC...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/9223 2023-05-15T14:56:44+02:00 Improving LADCP velocity with external heading, pitch, and roll Thurnherr, Andreas M. Goszczko, Ilona Bahr, Frank B. 2017-08-11 https://hdl.handle.net/1912/9223 en_US eng American Meteorological Society https://doi.org/10.1175/JTECH-D-16-0258.1 Journal of Atmospheric and Oceanic Technology 34 (2017): 1713-1721 https://hdl.handle.net/1912/9223 doi:10.1175/JTECH-D-16-0258.1 Journal of Atmospheric and Oceanic Technology 34 (2017): 1713-1721 doi:10.1175/JTECH-D-16-0258.1 Ocean Arctic Algorithms In situ oceanic observations Measurements Profilers oceanic Article 2017 ftwhoas https://doi.org/10.1175/JTECH-D-16-0258.1 2022-05-28T22:59:59Z Author Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Atmospheric and Oceanic Technology 34 (2017): 1713-1721, doi:10.1175/JTECH-D-16-0258.1. Data collected with acoustic Doppler current profilers installed on CTD rosettes and lowered through the water column [lowered ADCP (LADCP) systems] are routinely used to derive full-depth profiles of ocean velocity. In addition to the uncertainties arising from random noise in the along-beam velocity measurements, LADCP-derived velocities are commonly contaminated by bias errors due to imperfectly measured instrument attitude (heading, pitch, and roll). Of particular concern are the heading measurements, because it is not usually feasible to calibrate the internal ADCP compasses with the instruments installed on a CTD rosette, away from the magnetic disturbances of the ship. Heading data from dual-headed LADCP systems, which consist of upward- and downward-pointing ADCPs installed on the same rosette, commonly indicate heading-dependent compass errors with amplitudes exceeding 10°. In an attempt to reduce LADCP velocity errors, several dozen profiles of simultaneous LADCP and magnetometer/accelerometer data were collected in the Gulf of Mexico. Agreement between the LADCP profiles and simultaneous shipboard velocity measurements improves significantly when the former are processed with external attitude measurements. Another set of LADCP profiles with external attitude data was collected in a region of the Arctic Ocean where the horizontal geomagnetic field is too weak for the ADCP compasses to work reliably. Good agreement between shipboard velocity measurements and Arctic LADCP profiles collected at magnetic dip angles exceeding and processed with external attitude measurements indicate that high-quality velocity profiles can be obtained close to the magnetic poles. Part of this research was made ... Article in Journal/Newspaper Arctic Arctic Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Arctic Ocean Journal of Atmospheric and Oceanic Technology 34 8 1713 1721 |
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Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
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ftwhoas |
language |
English |
topic |
Ocean Arctic Algorithms In situ oceanic observations Measurements Profilers oceanic |
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Ocean Arctic Algorithms In situ oceanic observations Measurements Profilers oceanic Thurnherr, Andreas M. Goszczko, Ilona Bahr, Frank B. Improving LADCP velocity with external heading, pitch, and roll |
topic_facet |
Ocean Arctic Algorithms In situ oceanic observations Measurements Profilers oceanic |
description |
Author Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Atmospheric and Oceanic Technology 34 (2017): 1713-1721, doi:10.1175/JTECH-D-16-0258.1. Data collected with acoustic Doppler current profilers installed on CTD rosettes and lowered through the water column [lowered ADCP (LADCP) systems] are routinely used to derive full-depth profiles of ocean velocity. In addition to the uncertainties arising from random noise in the along-beam velocity measurements, LADCP-derived velocities are commonly contaminated by bias errors due to imperfectly measured instrument attitude (heading, pitch, and roll). Of particular concern are the heading measurements, because it is not usually feasible to calibrate the internal ADCP compasses with the instruments installed on a CTD rosette, away from the magnetic disturbances of the ship. Heading data from dual-headed LADCP systems, which consist of upward- and downward-pointing ADCPs installed on the same rosette, commonly indicate heading-dependent compass errors with amplitudes exceeding 10°. In an attempt to reduce LADCP velocity errors, several dozen profiles of simultaneous LADCP and magnetometer/accelerometer data were collected in the Gulf of Mexico. Agreement between the LADCP profiles and simultaneous shipboard velocity measurements improves significantly when the former are processed with external attitude measurements. Another set of LADCP profiles with external attitude data was collected in a region of the Arctic Ocean where the horizontal geomagnetic field is too weak for the ADCP compasses to work reliably. Good agreement between shipboard velocity measurements and Arctic LADCP profiles collected at magnetic dip angles exceeding and processed with external attitude measurements indicate that high-quality velocity profiles can be obtained close to the magnetic poles. Part of this research was made ... |
format |
Article in Journal/Newspaper |
author |
Thurnherr, Andreas M. Goszczko, Ilona Bahr, Frank B. |
author_facet |
Thurnherr, Andreas M. Goszczko, Ilona Bahr, Frank B. |
author_sort |
Thurnherr, Andreas M. |
title |
Improving LADCP velocity with external heading, pitch, and roll |
title_short |
Improving LADCP velocity with external heading, pitch, and roll |
title_full |
Improving LADCP velocity with external heading, pitch, and roll |
title_fullStr |
Improving LADCP velocity with external heading, pitch, and roll |
title_full_unstemmed |
Improving LADCP velocity with external heading, pitch, and roll |
title_sort |
improving ladcp velocity with external heading, pitch, and roll |
publisher |
American Meteorological Society |
publishDate |
2017 |
url |
https://hdl.handle.net/1912/9223 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_source |
Journal of Atmospheric and Oceanic Technology 34 (2017): 1713-1721 doi:10.1175/JTECH-D-16-0258.1 |
op_relation |
https://doi.org/10.1175/JTECH-D-16-0258.1 Journal of Atmospheric and Oceanic Technology 34 (2017): 1713-1721 https://hdl.handle.net/1912/9223 doi:10.1175/JTECH-D-16-0258.1 |
op_doi |
https://doi.org/10.1175/JTECH-D-16-0258.1 |
container_title |
Journal of Atmospheric and Oceanic Technology |
container_volume |
34 |
container_issue |
8 |
container_start_page |
1713 |
op_container_end_page |
1721 |
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1766328819025707008 |