The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Assessments of Nitrate Budget by Currents and Biogeochemical Process in the Korea Strait based on a 3D Physical-Biogeochemical Coupled Model

3차원 물리-생지화학 결합 모델을 이용한 대한해협 주변의 해류와 생지화학적 요인에 의한 질산염 유출입 평가

  • TAK, YONG JIN (Department of Atmospheric sciences, Yonsei University) ;
  • CHO, YANG KI (School of Earth and Environmental Sciences/ Research Institute of Oceanography, Seoul National University)
  • 탁용진 (연세대학교 대기과학과) ;
  • 조양기 (서울대학교 지구환경과학부/해양연구소)
  • Received : 2021.12.25
  • Accepted : 2022.02.15
  • Published : 2022.02.28
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Abstract

Nitrate (NO3-) plays an important role in aquaculture and ecosystems in the Korea Strait. Observational data propose that ocean currents are crucial to NO3- budget in the Korea Strait. However, assessment of budget by currents and biogeochemical processes has not yet been investigated. This study examines seasonal and spatial variations in NO3- budget by currents and biological processes in the Korea Strait from 2011 to 2019 using a physical-biogeochemical coupled model. Model results suggest that current-driven net supply of NO3- is consumed by uptake of phytoplankton in the Korea Strait. Advective influx is driven by the Tsushima warm current and the influx by the Jeju warm current is approximately one third of it. All of the influxes are transported out to the East Sea through the Korea Strait, of which two third passes through the western channel and the rest through the eastern channel. Annual mean NO3- net transport show that currents supply NO3- year round except for January, but the budget by biogeochemical processes consumes it every season except for winter.

질산염은 대한해협의 생태계 및 어업에 있어 중요한 영향을 준다. 관측을 기반으로 한 선행연구들은 해류가 질산염 수송에 중요한 영향을 줄 가능성을 제시하였다. 그러나 해류에 의한 질산염 수송과 생지화학적 요인에 의한 질산염 유출입의 정량적인 평가에 대한 연구는 없었다. 본 연구에서는 해류와 생지화학학적 요인에 대한 질산염 유출입의 계절 및 공간적인 변화를 2011년부터 2019년까지 물리-생지화학 결합 모델을 수행하여 살펴보았다. 모델 결과 분석을 통해 대한해협은 해류로 인해 질산염이 공급되며 공급된 질산염은 식물 플랑크톤의 섭식에 의해 소비됨을 알 수 있었다. 해류에 의한 질산염 수송량 중 제주도와 큐슈지역을 통과하는 해류에 의한 질산염 수송이 가장 컸으며 제주해협을 통과하는 해류에 의한 수송량은 이보다 1/3배 적었다 대한해협 서수도로 유출되는 질산염 수송량은 동수도로 유출되는 양보다 2배 더 많았다. 월 평균 질산염 순 유출입을 살펴보면 제주해협과 제주도와 큐슈를 통과하는 해류로 인해 공급된 질산염이 1월을 제외한 연중 대한해협에서 생지화학적 요인에 의해 순 유출되고 있었고, 이로 인해 대한해협을 통과하여 동해로 유입되는 질산염 수송량이 감소함을 알 수 있었다.

Keywords

Acknowledgement

이 논문은 2013년 해양수산부의 재원으로 한국해양과학기술진흥원의 지원을 받아 수행된 연구임(장기해양생태계 연구: 대마난류 영향권역의 환경변화와 생태계 반응). 이 논문에 이용된 정선해양관측자료는 국립수산과학원의 한국해양자료센터에서 제공 받았습니다.

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