해양과학기지에서 수행한 염분 표류 방지 실험 결과 및 염분 고품질 시계열 자료 생산을 위한 제언 KCI

Title
해양과학기지에서 수행한 염분 표류 방지 실험 결과 및 염분 고품질 시계열 자료 생산을 위한 제언
Alternative Title
Salinity drift prevention experiments in the Korea ocean research stations and suggestions for high quality salinity observation
Author(s)
이재익; 이수찬; 정종민; 민용침; 정진용; 김용선
KIOST Author(s)
Lee, Jae Ik(이재익)Lee, Su Chan(이수찬)Jeong, Jong Min(정종민)Min, Yong Chim(민용침)Jeong, Jin Yong(정진용)Kim, Yong Sun(김용선)
Alternative Author(s)
이재익; 이수찬; 정종민; 민용침; 정진용; 김용선
Publication Year
2021-10
Abstract
The importance of salinity has been highlighted to cope with climate changes and disaster prevention. The salinity of accuracy up to 0.005 is normally required in an open ocean to understand various oceanic and climatic phenomena; however, the reliability of salinity measured on the coast and open seas around Korea was low due to the lack of a standardized observation system and post-processing of quality verification. Korea Ocean Research Stations (KORS) has been producing salinity time series since 2003 through the Aanderaa conductivity-temperature (CT) 3919 inductive sensors, which have an advantage of on-site maintenance but tend to drift toward a lower conductivity because of biological attachments to the sensor. This study applied copper taping and UV light exposure techniques to the sensors and then compared its salinity measurements with RBR CTD mooring observations and SeaBird19 CTD profiles to assess a biofouling effect on salinity observations. This experiment shows that the salinity from the CT sensor without biofouling prevention starts to drift in a week, particularly for a surface sensor. This biofouling induced the decrease of salinity up to 10 in a month. The copper taping methodology efficiently suppressed the biological attachment but disturbed an electromagnetic field around the sensor, thus resulting in unrealistic salinity values. When UV light was periodically exposed at a distance of about 5 cm away from the CT sensor, relatively stable salinity could be observed without significant drift at least in two months. Besides, the SBE37 CTD, an electrode-type sensor, seems to be relatively free from biofouling but has difficulties in sensor maintenance and a sensor calibration process. Our results underline a double installation of salinity observation equipment with UV light exposure. In addition, the pre-calibration of a CT(D) sensor and post-verification should be included in a standard procedure for high-quality salinity measurement.
ISSN
2288-7903
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/42131
DOI
10.20481/kscdp.2021.8.4.323
Bibliographic Citation
한국연안방재학회지, v.8, no.4, pp.323 - 333, 2021
Publisher
(사)한국연안방재학회
Keywords
salinity; bio-fouling; drift; UV light; KORS; .
Type
Article
Language
Korean
Publisher
(사)한국연안방재학회
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