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

The Korean Society for Marine Environment and Energy (한국해양환경•에너지학회)
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Spatiotemporal Variations of Marine Environmental Characteristics in the Middle East Coast of Korea in 2013-2014

2013-2014년 한국 동해중부연안 해양환경특성의 시공간적 변화

  • Lee, Yong-Woo (Marine Environment Monitoring Team, Korea Marine Environment Management Corporation) ;
  • Park, Mi-Ok (Marine Environment Monitoring Team, Korea Marine Environment Management Corporation) ;
  • Kim, Seong-Soo (Marine Environment Monitoring Team, Korea Marine Environment Management Corporation)
  • 이용우 (해양환경관리공단 해양수질팀) ;
  • 박미옥 (해양환경관리공단 해양수질팀) ;
  • 김성수 (해양환경관리공단 해양수질팀)
  • Received : 2016.07.04
  • Accepted : 2016.11.17
  • Published : 2016.11.25
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Abstract

In order to elucidate the spatiotemporal variations of marine environmental parameters, we collected seawater samples in the middle east coast of Korea in 2013-2014. A high temperature and low salinity were distinctively observed in the summer and a low temperature and high salinity pattern in the winter. The temperature of the bottom water was in the range of $2^{\circ}C$ to $7^{\circ}C$, with the temperature being relatively high in the winter, while the salinity was measured to be around 34, with no large differences across the seasons. The dissolved oxygen concentrations were in the range of $7mg\;L^{-1}$ to $12mg\;L^{-1}$, and it was relatively high in May compared to other seasons. The seawater temperature and dissolved oxygen concentration at the surface layer showed a significant negative correlation in the autumn and winter seasons, based on which it is seemed that water temperature is the main factor controlling the amount of dissolved oxygen in the autumn and winter seasons. The dissolved inorganic nitrogen (DIN) and silicate (DSi) increased 11- and 7-fold, respectively, in the winter compared to the summer. The DIN to DIP (dissolved inorganic phosphorus) ratio for the surface seawater was approximately 16, but it was relatively low in the spring season. On the other hand, the DIN to DIP ratio was relatively high in the summer. Based on this, it is seemed that nitrogen and phosphorus were the growth-limiting nutrients for phytoplankton in the spring and summer, respectively. Water quality was I (excellent) ~III (medium) level at the most stations except for some stations (level IV) during the autumn season, having low dissolved oxygen saturations.

동해중부연안(후포~거진)에서 해수 중 해양환경특성의 시공간적 분포양상을 살펴보기 위해서 2013~2014년에 계절별로 현장조사를 실시하였다. 표층 수온과 염분은 하계에 고온 저염, 동계에 저온 고염의 분포 양상이 뚜렷하게 나타났다. 저층 수온은 약 $2{\sim}7^{\circ}C$ 범위로 겨울에 상대적으로 높았으며, 염분은 약 34로 계절별로 큰 차이를 보이지 않았다. 표층수중 용존산소 농도는 약 $7{\sim}12mg\;L^{-1}$의 범위로 다른 계절에 비해 5월(평균: $11.4{\pm}0.3mg\;L^{-1}$)에 상대적으로 높았다. 표층수에서 수온과 용존산소 농도는 가을과 겨울에 유의한 음의 상관관계를 보여 이 시기에 수온이 용존산소량을 조절하는 주요인자인 것으로 판단된다. 표층수 중 용존무기질소와 용존무기규소는 여름에 비해 겨울에 각각 약 11배, 7배 높았다. 표층수 중 DIN:DIP 비는 약 16이었으나 봄인 5월에 상대적으로 낮은 값을 보였다. 반면 여름에는 상대적으로 높은 비를 보여 봄에는 질소, 여름에는 인이 식물플랑크톤의 성장에 제한인자로서 작용했을 것으로 판단된다. 해수 수질은 조사기간동안 I(매우좋음)~III(보통) 등급 수준이었으며, 상대적으로 낮은 저층 용존산소 포화도를 보인 가을에 일부 정점에서 IV 등급 수준으로 나타났다.

Keywords

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