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

이인희; 함도식

doi:10.7850/jkso.2021.26.4.327

[국내논문] 동해 남서부해역의 표층 용존 기체 분포: 여름철 연안과 울릉분지의 일차생산력과 CO2 흡수 비교
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 원문보기

바다 : 한국해양학회지 = The sea : the journal of the Korean society of oceanography, v.26 no.4, 2021년, pp.327 - 342

이인희 (부산대학교 해양학과) , 함도식 (부산대학교 해양학과)

초록
AI-Helper

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(𝚫O₂/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 𝚫O₂/Ar, 낮은 fCO₂ 분포를 보여 연안에서 더 많은 일차 생산이 일어나 용존 CO₂ 흡수를 촉진한 것으로 나타났다. 삼척과 포항 연안에서 𝚫O₂/Ar을 기반으로 추정된 순군집생산(net community production)은 각각 19 ± 6과 60 ± 9 mmol O₂ m^-2d^-1로 울릉분지의 8 ± 4 mmol O₂ m^-2d^-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^-2d^-1로, 울릉분지의 -4.7 ± 2.5 mmol C m^-2d^-1보다 약 4배에서 5배 가량 높았다. 삼척과 포항 연안에서는 울릉분지에 비하여 질소포화도가 최대 3% 낮게 나타나 일차생산자에 의한 질소 고정이 일어났을 가능성을 제시하였다.

Abstract ▼ AI-Helper

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 (𝚫O2/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, 𝚫O2/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 𝚫O2/Ar were 19 ± 6 and 60 ± 9 mmol O2 m-2d-1 in the Samcheok and Pohang, respectively, 2-7 times higher than that of 8 ± 4 mmol O2 m-2d-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-2d-1 in the Samcheok and Pohang, respectively, 4-5 times higher than that of -4.7 ± 2.5 mmol C m-2d-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.

주제어

표/그림 (7)

그림 Fig. 1. Surface ∆O₂/Ar along the cruise track superimposed on sea surface temperature from MODIS Aqua in early June 2019.
그림 Fig. 2. Timeseries of the parameters observed in the southwestern East Sea, early June 2019.
그림 Fig. 3. Spatial distribution of the parameters observed in the southwestern East Sea, early June 2019.
표 Table 1. Water properties (average ± standard deviation) of Ulleung Basin, Samcheok, and Pohang
그림 Fig. 4. Vertical profiles of (a) temperature, (b) salinity, and (c) fluorescence, (d) gross primary production, (e) net community production, and (f) community respiration at St. 1 and 2.
그림 Fig. 5. (a) The estimates of net community production in the mixed layers (NCP_{in situ}) at Samcheok, Pohang, St.2, and in the Ulleung Basin. (b) Gross primary production, net community production (NCP_{in vitro}), and community respiration determined by ¹⁸O in vitro method at St.1 and St. 2. NCP_{in situ} is also shown for comparison with NCP_{in vitro}.
그림 Fig. 6. fCO₂ variation at the coastal areas and the Ulleung Basin. The circles represent calculated fCO₂ by mixing of 3 water masses (Refer to Section 4.2). The arrows depict reduction of fCO₂ by biological uptake.

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