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Article

Calcium Carbonate Saturation State in the Ulleung Basin, East Sea

동해 울릉분지의 탄산칼슘 포화상태

SO-YUN KIM1
,
SEONGHEE JEONG1
,
TONGSUP LEE1*
김 소윤1
,
정 성희1
,
이 동섭1*
1Department of Oceanography, Pusan National University
1부산대학교 해양학과
* Corresponding Author
31 August 2019. pp. 389-399
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Abstract

동해 울릉분지의 탄산칼슘 포화상태를 1999, 2014, 2017, 2018년도 해양 조사를 통해 수집된 pH, 용존무기탄소(DIC), 총알칼리도(TA) 자료를 이용하여 계산하였다. 1999년에 비해 2010년대에 전 수심에서 탄산염 포화상태는 유의하게 감소하였다. 2018년 현재 방해석과 선석의 포화면 수심은 각각 약 500 m와 200 m로 상승하였다. 탄산칼슘 포화상태를 결정하는 주된 화학종인 탄산이온은 상층과 심층에서 다른 분포를 보였다: 상층에서는 약 175 μmol kg-1로 비교적 높고, 심층에서는 50 μmol kg-1 이하로 아주 낮게 나타났다. 그러나 탄산이온 농도의 감소 경향은 심층보다 상층에서 두드러졌는데, 이는 2000년대에 대기에서 이산화탄소의 침투가 주로 상층에서 일어나는 것이 반영된 결과로 해석된다.

The calcium carbonate saturation state in the Ulleung Basin of East Sea was calculated using bottle data set of pH, dissolved inorganic carbon and total alkalinity obtained from the year 1999, 2014, 2017, and 2018 cruise. In the 2010s calcium carbonate saturation state was significantly lowered at all depth compared to the 1999 reference state. Accordingly calcite saturation horizon and aragonite saturation horizon shoaled to 500 m and 200 m, respectively. A key chemical species for the calcium carbonate saturation state, carbonate ion showed distinctive profile between upper and deep waters: it is moderately high (~ 175 μmol kg-1) in upper waters and very low (< 50 μmol kg-1) in the deep waters. However the decreasing trend of carbonate ion concentration was pronounced in the upper water than deep waters, suggesting atmospheric CO2 penetration is largely confined to the upper waters in the 2000s.

Keywords
Calcium carbonate saturation state
Aragonite saturation horizon
Calcite saturation horizon
Carbonate ion
Ulleung Basin

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Information
  • Publisher :The Korean Society of Oceanography
  • Publisher(Ko) :한국해양학회
  • Journal Title :The Sea Journal of the Korean Society of Oceanography
  • Journal Title(Ko) :한국해양학회지 바다
  • Volume : 24
  • No :3
  • Pages :389-399
  • Received Date : 2019-07-01
  • Revised Date : 2019-08-22
  • Accepted Date : 2019-08-22
  • DOI :https://doi.org/10.7850/jkso.2019.24.3.389
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