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http://dx.doi.org/10.7846/JKOSMEE.2015.18.3.143

Dynamic Characteristics of Water Column Properties based on the Behavior of Water Mass and Inorganic Nutrients in the Western Pacific Seamount Area  

Son, Juwon (Deep-sea and Seabed Mineral Resources Research Center, KIOST)
Shin, Hong-Ryeol (Department of Atmospheric Science, Kongju National University)
Mo, Ahra (Deep-sea and Seabed Mineral Resources Research Center, KIOST)
Son, Seung-Kyu (Deep-sea and Seabed Mineral Resources Research Center, KIOST)
Moon, Jai-Woon (Deep-sea and Seabed Mineral Resources Research Center, KIOST)
Kim, Kyeong-Hong (Deep-sea and Seabed Mineral Resources Research Center, KIOST)
Publication Information
Journal of the Korean Society for Marine Environment & Energy / v.18, no.3, 2015 , pp. 143-156 More about this Journal
Abstract
In order to understand the dynamic characteristics of water column environments in the Western Pacific seamount area (approximately $150.2^{\circ}E$, $20^{\circ}N$), we investigated the water mass and the behavior of water column parameters such as dissolved oxygen, inorganic nutrients (N, P), and chlorophyll-a. Physico-chemical properties of water column were obtained by CTD system at the nine stations which were selected along the east-west and south-north direction around the seamount (OSM14-2) in October 2014. From the temperature-salinity diagram, the main water masses were separated into North Pacific Tropical Water and Thermocline Water in the surface layer, North Pacific Intermediate Water in the intermediate layer, and North Pacific Deep Water in the bottom layer, respectively. Oxygen minimum zone (OMZ, mean $O_2$ $73.26{\mu}M$), known as dysoxic condition ($O_2<90{\mu}M$), was distributed in the depth range of 700~1,200 m throughout the study area. Inorganic nutrients typified by nitrite + nitrate and phosphate showed the lowest concentration in the surface mixed layer and then gradually increased downward with representing the maximum concentration in the OMZ, with lower N:P ratio (13.7), indicating that the nitrogen is regarded as limiting factor for primary production. Vertical distribution of water column parameters along the east-west and south-north station line around the seamount showed the effect of bottom water inflowing at around 500 m deep in the western and southern region, and concentrations of water column parameters in the bottom layer (below 2,500 m deep) of the western and southern region were differently distributed comparing to those of the other side regions (eastern and northern). The value of Excess N calculated from Redfield ratio (N:P=16:1) represented the negative value throughout the study area, which indicated the nitrogen sink dominant environments, and relative higher value of Excess N observed in the bottom layer of western and southern region. These observations suggest that the topographic features of a seamount influence the circulation of bottom current and its effects play a significant role in determining the behavior of water column environmental parameters.
Keywords
Hydrogenetic Crust; Seamount; Inorganic Nutrients; Oxygen Minimum Zone; Water Column Environments;
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Times Cited By KSCI : 3  (Citation Analysis)
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