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Sources and Distributions of Dissolved Organic Matter by Fluorescence Method in the Northeastern Pacific Ocean
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  • Journal title : Ocean and Polar Research
  • Volume 29, Issue 2,  2007, pp.87-99
  • Publisher : Korea Institute of Ocean Science & Technology
  • DOI : 10.4217/OPR.2007.29.2.087
 Title & Authors
Sources and Distributions of Dissolved Organic Matter by Fluorescence Method in the Northeastern Pacific Ocean
Son, Ju-Won; Son, Seung-Kyu; Ju, Se-Jong; Kim, Kyeong-Hong; Kim, Woong-Seo; Park, Yong-Chul;
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This study was conducted to understand the source and behavior of organic matter using the fluorescent technique (excitation-emission matrix) as a part of environmental monitoring program in the Korea manganese nodule mining site in the Northeastern Pacific Ocean. Water samples were collected at , and along in August 2005. The concentration of total organic carbon (TOC) ranged from 58.01 to . The vertical distribution of TOC was characterized as higher in the surface layer and decreased with depth. At , depth-integrated (from surface to 200 m depth) TOC was , which was 1.4 times higher value than other stations. The exponential decay curve fit of vertical profile of TOC indicated that 59% of organic carbon produced by primary production in the surface layer could be decomposed by bacteria in the water column. Dissolved organic matter is generally classified into two distinctive groups based on their fluorescence characteristics using three-dimensional excitation/emission (Ex/Em) fluorescence mapping technique. One is known as biomacromolecule (BM; protein-like substance; showing max. at Ex 280/Em 330), mainly originated from biological metabolism. The other is geomacromolecule (GM; humic-like substance; showing max. at Ex 330/Em 430), mainly originated from microbial degradation processes. The concentration of BM and GM was from 0.42 to 7.29 TU (tryptophan unit) and from 0.06 to 1.81 QSU (quinine sulfate unit), respectively. The vertical distribution of BM was similar to that of TOC as high in the surface and decreased with depth. However, the vertical distribution of GM showed the reverse pattern of that of BM. From these results, it appeared that BM occupied a major part of TOC and was rapidly consumed by bacteria in the surface layer. GM was mainly transformed from BM by microbial processes and was a dominant component of TOC in the deep-sea layer.
 Cited by
국내 지구화학도 작성기술의 진화,신성천;염승준;이평구;안주성;이진수;

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