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Article

The Surface Distribution of Dissolved Gases in the Southwestern East Sea: Comparison of the Primary Production and CO2 Absorption in Summer between Coastal Areas and the Ulleung Basin

동해 남서부해역의 표층 용존 기체 분포: 여름철 연안과 울릉분지의 일차생산력과 CO2 흡수 비교

INHEE LEE1
,
DOSHIK HAHM2*
이 인희1
,
함 도식2*
1Graduate Student, Department of Oceanography, Pusan National University, Busan 46241, Korea
2Associate Professor, Department of Oceanography, Pusan National University, Busan 46241, Korea
1부산대학교 해양학과 대학원생
2부산대학교 해양학과 부교수
*Corresponding Author
30 November 2021. pp. 327-342
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Abstract

The global coastal region is considered as a sink for atmospheric CO2. Since most of the studies in the East Sea focused on the Ulleung Basin, the importance of coastal region for carbon cycle has been overlooked. In this study, we compared the biological pump and CO2 absorption between the Ulleung Basin and coastal region by surface measurements of biological O2 supersaturation (∆O2/Ar) and partial pressure of CO2 (fCO2). Cold and less saline waters in the coastal regions were in contrast with a warm and saline water in the Ulleung Basin. The coastal waters near Samcheok and Pohang showed higher fluorescence, ∆O2/Ar, and lower fCO2 than those in the Ulleung Basin, indicating higher primary production and CO2 absorption in the areas. The average net community production estimated by ∆O2/Ar were 19 ± 6 and 60 ± 9 mmol O2 m−2 d−1 in the Samcheok and Pohang, respectively, 2-7 times higher than that of 8 ± 4 mmol O2 m−2 d−1 in the Ulleung Basin. Similarly, the average CO2 flux between the seawater and atmosphere were -17.1 ± 8.9 and -25.8 ± 13.2 mmol C m−2 d−1 in the Samcheok and Pohang, respectively, 4-5 times higher than that of -4.7 ± 2.5 mmol C m−2 d−1 in the Ulleung Basin. In the Samcheok and Pohang, degrees of N2 saturation were lower by 3% than that the ambient waters, suggesting the possibility of nitrogen fixation by primary producers.

Keywords
O2/Ar
CO2 flux
Nitrogen fixation
East sea
Coastal region

연안은 전 지구 관점에서 대기 이산화탄소를 흡수하는 것으로 평가된다. 그동안 동해의 탄소 순환에 관한 연구들이 울릉분지에 집중되어 있어서 동해 연안이 탄소 순환에 기여하는 역할에 대한 이해는 제한적이다. 본 연구에서는 표층의 생물학적 과포화도(∆O2/Ar)와 이산화탄소 분압(fCO2)의 변화를 관측하여 울릉분지와 연안의 생물 펌프 세기 및 탄소 흡수력을 비교하였다. 연안은 저온 저염한 환경으로 고온 고염한 울릉분지와 대비되었다. 삼척과 포항 연안에서는 울릉분지에 비해 높은 생물량과 ∆O2/Ar, 낮은 fCO2 분포를 보여 연안에서 더 많은 일차 생산이 일어나 용존 CO2 흡수를 촉진한 것으로 나타났다. 삼척과 포항 연안에서 ∆O2/Ar을 기반으로 추정된 순군집생산(net community production)은 각각 19 ± 6과 60 ± 9 mmol O2 m−2 d−1로 울릉분지의 8 ± 4 mmol O2 m−2 d−1에 비하여 약 2-7배 가량 활발하게 생물 펌프가 작동하고 있었다. 삼척과 포항 연안의 CO2 교환율은 각각 -17.1 ± 8.9와 -25.8 ± 13.2 mmol C m−2 d−1로, 울릉분지의 -4.7 ± 2.5 mmol C m−2 d−1보다 약 4배에서 5배 가량 높았다. 삼척과 포항 연안에서는 울릉분지에 비하여 질소포화도가 최대 3% 낮게 나타나 일차생산자에 의한 질소 고정이 일어났을 가능성을 제시하였다.

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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 : 26
  • No :4
  • Pages :327-342
  • Received Date : 2021-09-11
  • Revised Date : 2021-10-29
  • Accepted Date : 2021-11-03
  • DOI :https://doi.org/10.7850/jkso.2021.26.4.327
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