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http://dx.doi.org/10.7850/jkso.2015.20.1.16

Spatiotemporal Variations of Marine Environmental Parameters in the South-western Region of the East Sea  

Won, Jong-Ho (Marine Climate & Environment Team, Korea Marine Environment Management Corporation,)
Lee, Young-Woo (Marine Climate & Environment Team, Korea Marine Environment Management Corporation,)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.20, no.1, 2015 , pp. 16-28 More about this Journal
Abstract
In order to elucidate the spatiotemporal variations of marine environmental parameters, we collected seawater samples in the south-western region of the East Sea in May, August, and November 2012 and February 2013. The concentrations of dissolved inorganic nutrients (dissolved inorganic nitrogen, phosphorus, and silicate) in surface seawater during the summer season were lower than those during autumn and winter seasons, which the mixed layer is deeper. The low nutrient concentration in spring and summer seasons seems by consumption of dissolved inorganic nutrients by phytoplankon photosynthesis (high chlorophyll a concentration) and the limited supply of dissolved inorganic nutrients from subsurface layer having high nutrients. The low nutrient concentration during spring season seems to be related to the limited supply of dissolved inorganic nutrients from land and subsurface layer because the concentration of chlorophyll a was low. The DIN:DIP ratio was a wide range of average $15.6{\pm}13.6$ in the surface seawater compared to that of average $14.8{\pm}4.2$ in the bottom seawater during sampling periods. The dissolved inorganic nitrogen might act as a limiting factor of the growth of phytoplankton because the DIN:DIP ratio (on average $8.35{\pm}4.67$) was low during the spring season.
Keywords
Nutrient; DIN:DIP ratio; Chlorophyll a; Limiting factor; South-western region of the East Sea;
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