Journal of the Korean Society for Marine Environment & Energy (한국해양환경ㆍ에너지학회지)

The Korean Society for Marine Environment and Energy (한국해양환경•에너지학회)
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Distribution of Water Masses and Distribution Characteristics of Dissolved Inorganic and Organic Nutrients in the Southern Part of the East Sea of Korea: Focus on the Observed Data in September, 2011

동해 남부 해역의 수괴 분포와 용존 무기 및 유기 영양염의 분포 특성: 2011년 9월 관측자료를 중심으로

  • Kwon, Hyeong Kyu (Korea Inter-University Institute of Ocean Science, Pukyong National University) ;
  • Oh, Seok Jin (Department of Oceanography, Pukyong National University) ;
  • Park, Mi Ok (Department of Oceanography, Pukyong National University) ;
  • Yang, Han-Soeb (Department of Oceanography, Pukyong National University)
  • Received : 2014.01.20
  • Accepted : 2014.03.21
  • Published : 2014.05.25
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Abstract

Distribution characteristics of water masses, dissolved inorganic and organic nutrients were investigated in the southern part of the East Sea of Korea in September, 2011. On the basis of the vertical profiles of temperature, salinity and dissolved oxygen, water masses in the study area were divided into 4 major groups, such as WM (water mass)-I, WM-II, WM-III, WM-IV. Their characteristics were similar to Tsushima Surface Water (TSW), Tsushima Middle Water (TMW), North Korea Cold Water (NKCW) and East Sea Proper Water (ESPW), respectively. In the vertical profiles of dissolved nutrients, dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) concentrations were highest in the WM-IV, followed by WM-III, WM-II, WM-I. On the contrary, distribution of dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) were highest in the WM-I, followed by WM-II, WM-III, WM-IV. Although the DIN : DIP ratio in all of the water masses was similar to Redfield ratio(16), the DIN : DIP ratio in mixed layer was about 5.3, indicating that inorganic nitrogen is the limiting factor for the growth of phytoplankton. However, the DON proportion in dissolved total nitrogen (DTN) was about 70% in the mixed layer where inorganic nitrogen is limiting factor. Thus, enriched DON may play an important source of the nutrient for the growth of phytoplankon in the East Sea.

2011년 9월에 동해의 수괴 분포와 용존 무기 및 유기 영양염의 분포 특성을 파악하였다. 수온, 염분, 용존산소의 분포를 통하여 연구해역의 수괴 기원은 WM(water mass)-I, WM-II, WM-III, WM-IV 등 4개의 대표적인 수괴로 구분되었으며, 그 성격은 각각 대마난류표층수, 대마난류중층수, 북한한류수, 동해고유수와 유사하였다. 용존 영양염의 경우, 용존 무기 질소(DIN; dissolved inorganic nitrogen)와 용존 무기 인(DIP; dissolved inorganic phosphorus)은 WM-IV에서 가장 높았으며, WM-III, WM-II, WM-I 순으로 나타났다. 반면에 용존 유기 질소(DON; dissolved organic nitrogen)와 용존 유기 인(DOP; dissolved organic phosphorus)은 무기 영양염과 상반되는 분포를 보였다. 연구해역에서 수괴 전체에 대한 DIN : DIP 비는 약 15.8로 Redfield ratio(16)에 근접한 수치를 보이고 있으나, 혼합층의 경우 5.3으로 무기질소가 식물플랑크톤 성장의 제한 요인으로 작용할 수 있는 것으로 보였다. 하지만 무기 질소가 제한된 혼합층에서 DON은 용존 총 질소(DTN; dissolved total nitrogen) 중 약 70%를 구성하였다. 따라서 풍부한 DON은 동해에서 식물플랑크톤의 성장을 위한 중요한 영양염 공급원으로 판단된다.

Keywords

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