[논문]해양포유류 부착 CTD 관측 자료의 품질 관리 방법에 관한 고찰 및 사례 연구

윤승태; 이원영

doi:10.4217/opr.2021.43.4.321

해양포유류 부착 CTD 관측 자료의 품질 관리 방법에 관한 고찰 및 사례 연구
Quality Control Methods for CTD Data Collected by Using Instrumented Marine Mammals: A Review and Case Study 원문보기

Ocean and polar research, v.43 no.4, 2021년, pp.321 - 334

윤승태 (경북대학교 자연과학대학 지구시스템과학부) , 이원영 (한국해양과학기술원부설 극지연구소 생명과학연구부)

Abstract ▼ AI-Helper

'Marine mammals-based observations' refers to data acquisition activities from marine mammals by instrumenting CTD (Conductivity-Temperature-Depth) sensors on them for recording vertical profiles of ocean variables such as temperature and salinity during animal diving. It is a novel data collecting platform that significantly improves our abilities in observing extreme environments such as the Southern Ocean with low cost compared to the other conventional methods. Furthermore, the system continues to create valuable information until sensors are detached, expanding data coverage in both space and time. Owing to these practical advantages, the marine mammals-based observations become popular to investigate ocean circulation changes in the Southern Ocean. Although these merits may bring us more opportunities to understand ocean changes, the data should be carefully qualified before we interpret it incorporating shipboard/autonomous vehicles/moored CTD data. In particular, we need to pay more attention to salinity correction due to the usage of an unpumped-CTD sensor tagged on marine mammals. In this article, we introduce quality control methods for the marine mammals-based CTD profiles that have been developed in recent studies. In addition, we discuss strategies of quality control specifically for the seal-tagging CTD profiles, successfully having been obtained near Terra Nova Bay, Ross Sea, Antarctica since February 2021. It is the Korea Polar Research Institute's research initiative of animal-borne instruments monitoring in the region. We anticipate that this initiative would facilitate collaborative efforts among Polar physical oceanographers and even marine mammal behavior researchers to understand better rapid changes in marine environments in the warming world.

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표/그림 (6)

그림 Fig. 1. Example pictures for CTD-SRDL deployment and seal-tagging at near Jang Bogo Station in Terra Nova Bay, Antarctica in 2021
그림 Fig. 2. Schematic procedures for quality control of two cases' CTD-SRDL data
그림 Fig. 3. (a) Location of the study area (a black box) in the global map. (b) Spatial distribution of profiles recorded by the 23 tagged-seals in the western Ross Sea from February to June 2021. Blue (red) lines with numbers in sky-blue (orange) box represent records of more (less) than 100 days. The positions of numbers indicate the last record position of each tagged-seal. The records of less than 10 days are excluded in this figure. JBS, DIT, and TNB represent Jang Bogo Station, Drygalski Ice Tongue, and Terra Nova Bay, respectively. Gray contours are for 400, 700, 1000, and 1500 m depth
표 Table 1. Basic information on the CTD-SRDLs deploying in the western Ross Sea on 23 Weddell seals in February and March 2021
그림 Fig. 4. (a), (c), (e) Hovmöller diagram of raw temperature data collected by #43, 34, and 52 tagged-seals (Fig. 3b and Table 1). (b), (d), (f) The same as Fig. 4 (a), (c), (e), but for raw salinity data. Red arrows indicate the periods when abnormal values are found in salinity profiles
그림 Fig. 5. (a) θ-S diagram for raw CTD- SRDL data collected by 23 tagged- seals (gray) and the first-round quality-controlled data (blue). The dotted black line indicates the freezing point at the surface depending on the salinity, and the dashed black lines indicate isopycnals. The solid dark-gray lines denote 28 and 28.27 kg/m³ neutral density (γⁿ) surfaces. The black box indicates the ranges of Fig. 5b. The black (red) crosses indicate water types in Terra Nova Bay reported in Budillon et al. 2002 (Yoon et al. 2020). AASW, CDW, mCDW, AABW, LSSW, MSW, and DISW represent Antarctic Surface Water, Circumpolar Deep Water modified Circumpolar Deep Water, Antarctic Bottom Water, Low Salinity Shelf Water, Modified Shelf Water, and Deep Ice Shelf Water, respectively. (b) The magnified plot of Fig. 5(a). TISW and HSSW represent Terra Nova Bay Ice Shelf Water and High Salinity Shelf Water

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