Geochemical Characteristics of the Sediment Pore Water in the Northeastern Equatorial Pacific

Title
Geochemical Characteristics of the Sediment Pore Water in the Northeastern Equatorial Pacific
Author(s)
이태희; 김경홍; 손주원; 손영백
KIOST Author(s)
Lee, Tae Hee(이태희)Kim, Kyeong Hong(김경홍)Son, Young Baek(손영백)
Alternative Author(s)
이태희; 김경홍; 손영백
Publication Year
2017-09-24
Abstract
This study investigated dissolved oxygen (DO), nutrients, manganese (Mn) and Iron (Fe) characteristics at the sediment pore water in Northeastern Equatorial Pacific based on the geochemical analyses. The DO concentrations of sediment pore water at the upper sediment ranged 90-136  M, drastically decreased with sediment depth increasing, showed that ranged 30-60  M. The concentrations of ammonia, nitrate, phosphate and silicate ranged 0.02-16.34 μM, 44.73-229.32 μM, 2.04-2.98 μM and 73.44-405.24 μM, respectively. The vertical profiles of ammonia and nitrate at the sediment pore water showed a contradictory distribution in SD07 and SD16. The concentrations of Mn and Fe ranged 0.1-8.1 μM and 0.3-40.4 μM, respectively. Low concentrations of Mn and Fe are due to the oxic condition at the sediment upper layer. The Mn and Fe reduction zones generally occurs below nitrate reduction zone and at the depth of complete DO removal from the pore water. Manganese reduction in pelagic sediments may be involved in the formation of ferromanganese nodules, since under some circumstances manganese reduction in the sediments and the resulting upward diffusion of dissolved manganese across the sediment-water interface may be an important source of manganese nodules.ater at the upper sediment ranged 90-136  M, drastically decreased with sediment depth increasing, showed that ranged 30-60  M. The concentrations of ammonia, nitrate, phosphate and silicate ranged 0.02-16.34 μM, 44.73-229.32 μM, 2.04-2.98 μM and 73.44-405.24 μM, respectively. The vertical profiles of ammonia and nitrate at the sediment pore water showed a contradictory distribution in SD07 and SD16. The concentrations of Mn and Fe ranged 0.1-8.1 μM and 0.3-40.4 μM, respectively. Low concentrations of Mn and Fe are due to the oxic condition at the sediment upper layer. The Mn and Fe reduction zones generally occurs below nitrate reduction zone and at the depth of complete DO removal from the pore water. Manganese reduction in pelagic sediments may be involved in the formation of ferromanganese nodules, since under some circumstances manganese reduction in the sediments and the resulting upward diffusion of dissolved manganese across the sediment-water interface may be an important source of manganese nodules.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/23822
Bibliographic Citation
PICES 2017 Annual Meeting, pp.176, 2017
Publisher
PICES
Type
Conference
Language
English
Publisher
PICES
Related Researcher
Research Interests

Seawater Chemistry,Geochemistry,해수화학,지화학

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