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The Improvement of CTD Data through Post Processing
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  • Journal title : Ocean and Polar Research
  • Volume 31, Issue 4,  2009, pp.339-347
  • Publisher : Korea Institute of Ocean Science & Technology
  • DOI : 10.4217/OPR.2009.31.4.339
 Title & Authors
The Improvement of CTD Data through Post Processing
Choi, A-Ra; Park, Young-Gyu; Min, Hong-Sik; Kim, Kyeong-Hong;
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It is possible to obtain accurate temperature and salinity profiles of the oceans using a SBE 911plus CTD and accompanying data conversion packages. To obtain highly accurate results, CTD data needs to be carefully processed in addition to proper and regular maintenance of the CTD itself. Since the manufacturer of the CTD provides tools that are necessary for post processing, it is possible to conduct proper processing without too much effort. Some users, however, are not familiar with all of the processes and inadvertently ignore some of these processes at the expense of data quality. To draw attention to these and other similar issues, we show how it is possible to improve data quality by utilizing a few extra processes to the standard or default data process procedures with CTD data obtained from the equatorial Eastern Pacific between 2001 and 2005, and 2007. One easy step that is often ignored in the standard data process procedure is "wild edit", which removes abnormal values from the raw data. If those abnormal values are not removed, the abnormality could spread vertically during subsequent processes and produce abnormal salinity in a range much wider than that of the raw data. To remove spikes in salinity profiles the "align CTD" procedure must be carried out not with the default values included in the data processing software but with a proper time constant. Only when "cell thermal mass" correction is conducted with optimal parameters, we can reduce the difference between upcast and downcast, and obtain results that can satisfy the nominal accuracy of the CTD.
CTD data post processing;data quality control;
 Cited by
2006~2010년 기간 동안 대한해협 서수도에서 관측된 해수 물성의 변동,민홍식;박재훈;최아라;박영규;신경순;장풍국;

Ocean and Polar Research, 2011. vol.33. spc3, pp.325-336 crossref(new window)
CTD 교정 시스템 구축 및 불확도 평가,이정한;황근춘;김은수;이승훈;

Ocean and Polar Research, 2014. vol.36. 1, pp.77-85 crossref(new window)
Establishment of CTD Calibration System and Uncertainty Estimation, Ocean and Polar Research, 2014, 36, 1, 77  crossref(new windwow)
Observation of Water Property Variations in the Western Channel of the Korea Strait During 2006-2010, Ocean and Polar Research, 2011, 33, spc3, 325  crossref(new windwow)
Thorpe Scale Analysis using CTD Observations on the Continental Slope of the Southwestern East Sea, Ocean and Polar Research, 2015, 37, 2, 107  crossref(new windwow)
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Morision J, Anderson R, Larson N, D'Asaro E, Boyd T (1994) The correction for thermal-lag effect in sea-bird CTD data. J Atmos Ocean Technol 11:1151-1164 crossref(new window)

Sea-Bird Electronic (2008a) SBE 9plus CTD User's manual. 66 p

Sea-Bird Electronic (2008b) SBE 11plus V2 Deck Unit User's Manual. 79 p

Sea-Bird Electronic (2008c) SEASOFT-Win32: SBE Data Processing User's manual. 141 p