Ocean and Polar Research

  • 제38권3호
  • /
  • Pages.195-207
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  • 2016
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  • 1598-141X(pISSN)
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  • 2234-7313(eISSN)
한국해양과학기술원 (Korea Institute of Ocean Science & Technology)
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플라이스토세 전기(2.4-1.25 Ma) 동안 베링해 중부 대륙사면 지역의 규조 골격내 유기물 질소동위원소 값에 의한 질산염 이용률의 변화 복원

Reconstruction of Nitrate Utilization Rate Change Based on Diatom-bound Nitrogen Isotope Values in the Central Slope Area of the Bering Sea during the Early Pleistocene (2.4-1.25 Ma)

  • 김성한 (부산대학교 자연과학대학 해양학과) ;
  • 김부근 (부산대학교 자연과학대학 해양학과)
  • Kim, Sunghan (Department of Oceanography, College of Natural Sciences, Pusan National University) ;
  • Khim, Boo-Keun (Department of Oceanography, College of Natural Sciences, Pusan National University)
  • 투고 : 2016.05.04
  • 심사 : 2016.09.09
  • 발행 : 2016.09.30
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초록

Because the high latitude region in the North Pacific is characterized by high primary production in the surface water enriched with nutrients, it is important to understand the variation of surface water productivity and associated nutrient variability in terms of global carbon cycle. Surface water productivity change or its related nutrient utilization rate during the Northern Hemisphere Glaciation (NHG; ca. 2.73 Ma) has been reported, but little is known about such circumstances under gradual climate cooling since the NHG. Bulk nitrogen isotope (${\delta}^{15}N_{bulk}$) of sedimentary organic matter has been used for the reconstruction of nutrient utilization rate in the surface water. However, sedimentary organic matter experiences diagenesis incessantly during sinking through the water column and after burial within the sediments. Thus, in this study we examine the degree of nitrate utilization rate during the early Pleistocene (2.4-1.25 Ma) since the NHG, using the diatom-bound nitrogen isotope (${\delta}^{15}N_{db}$), which is known to be little influenced by diagenesis, from Site U1343 in the Bering slope area. ${\delta}^{15}N_{db}$ values range from ~0.5 to 5.5‰, which is lower than ${\delta}^{15}N_{bulk}$ values, but they vary with larger amplitude. Variation patterns between ${\delta}^{15}N_{db}$ values and biogenic opal concentration are generally consistent, which indicates that the nitrate utilization rate is closely related to opal productivity change in the surface water. A positive correlation between opal productivity and nitrate utilization rate was observed, which is different from the other high latitude regions in the North Pacific. The main reason for this contrasting relationship is that the primary production in the surface water at Site U1343 is influenced mostly by the degree of sea ice formation. Still, although concerns about diagenetic alteration have been avoided by using ${\delta}^{15}N_{db}$, the effects of the preservation state of biogenic opal and the species-dependent isotopic fractionation on ${\delta}^{15}N_{db}$ should be assessed in the future studies.

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