Ocean Science Journal

, Volume 52, Issue 4, pp 489–499 | Cite as

Sources and distribution of allochthonous organic matter in surface sediment from the Seomjin River to the southern inner shelf of Korea

  • Adegoke Olugboyega Badejo
  • Sangmin Hyun
  • Wonnyon Kim
  • Se-Jong Ju
  • Bareum Song
Article
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Abstract

The spatial distributions of δ13C, δ15N, and n-alkanes were investigated to determine the source and transportation of allochthonous organic matter from the mouth of the Seomjin River to the southern inner shelf break of Korea. Total organic carbon (%) ranged from 0.3% to 1.6% (average = 0.80%, n = 81), and the C/N ratio varied from 2.4 to 12.4 (average = 6.76, n = 81). The δ13C values ranged from −25.86 to −20.26‰ (average = −21.47‰, n = 81), and δ15N values ranged from 4.37‰ to 8.57‰ (average = 6.72‰, n = 81). The contribution of the terrestrial fraction of organic matter to the total ranged from 4.4% to 97.7% (average = 24.4%, n = 81), suggesting higher amounts around the catchment area and lower amounts in the offshore area. The concentration of total n-alkanes (nC25 − nC35) was higher at the boundary between the outer bay and inner shelf break (BOBIS). Average chain length and the carbon preference index both indicated that major leaf wax n-alkanes accounted for the observed distribution of terrestrial organic matter, and were dominant in the inner shelf break (around BOBIS) and outer shelf break. Based on the spatial distribution of the total n-alkanes and the sum of nC27, nC29, and nC31, the terrestrial organic matter distribution was considered to be controlled by local oceanographic conditions, especially at the center of the BOBIS. In addition to enabling the distribution and source of terrestrial organic matter to be identified, the n-alkanes indicated that minor anthropogenic allochthonous organic materials were superimposed on the total organic materials in the central part of Yeosu Bay and the catchment area. The n-alkane indices revealed weathered petroleum contamination, with contamination levels being relatively low at the present time.

Keywords

seomjin river δ13C δ15N n-alkanes ACL CPI 
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Copyright information

© Korea Institute of Ocean Science & Technology (KIOST) and the Korean Society of Oceanography (KSO) and Springer Science+Business Media B.V., part of Springer Nature 2017

Authors and Affiliations

  • Adegoke Olugboyega Badejo
    • 1
  • Sangmin Hyun
    • 2
  • Wonnyon Kim
    • 1
  • Se-Jong Ju
    • 1
  • Bareum Song
    • 2
  1. 1.Deep-sea and Seabed Mineral Resources Research CenterKIOSTAnsanKorea
  2. 2.Korean Seas Geosystem Research CenterKIOSTAnsanKorea

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