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2023 Vol.45, Issue 3

Article

Variation of Biogenic Opal Production on the Conrad Rise in the Indian Sector of the Southern Ocean since the Last Glacial Period

남극해 인도양 해역에 위치한 콘래드 해령 지역의 마지막 빙하기 이후 생물기원 오팔 생산의 변화

JuYeon Yang1
,
Ikehara Minoru2
,
Hyuk Choi1
,
Boo-Keun Khim3*
양 주연1
,
Minoru Ikehara2
,
최 혁1
,
김 부근3*
1Division of Earth and Environmental System, Pusan National University, Busan 46241, Korea
2Center of Advanced Marine Core Research, Kochi University, Kochi 783-8502, Japan
3Department of Oceanography and Marine Research Institute, Pusan National University, Busan 46241, Korea
1부산대학교 자연과학대학 지구환경시스템학부 (46241) 부산광역시 금정구 부산대학로 63번길 2
2Center of Advanced Marine Core Research, Kochi University Kochi 783-8502, Japan
3부산대학교 해양학과 및 해양연구소 (46241) 부산광역시 금정구 부산대학로 63번길 2
*Corresponding Author
30 September 2023. pp. 141-153
PDF XML Citation
Abstract

Biological pump processes generated by diatom production in the surface water of the Southern Ocean play an important role in exchanging CO2 gas between the atmosphere and ocean. In this study, the biogenic opal content of the sediments was measured to elucidate the variation in the primary production of diatoms in the surface water of the Southern Ocean since the last glacial period. A piston core (COR-1bPC) was collected from the Conrad Rise, which is located in the Indian sector of the Southern Ocean. The sediments were mainly composed of siliceous ooze, and sediment lightness increased and magnetic susceptibility decreased in an upward direction. The biogenic opal content was low (38.9%) during the last glacial period and high (73.4%) during the Holocene, showing a similar variation to that of Antarctic ice core ΔT and CO2 concentration. In addition, the variation of biogenic opal content in core COR-1bPC is consistent with previous results reported in the Antarctic Zone, south of the Antarctic Polar Front, in the Southern Ocean. The glacial-interglacial biogenic opal production was influenced by the extent of sea ice coverage and degree of water column stability. During the last glacial period, the diatom production was reduced due to the penetration of light being limited in the euphotic zone by the extended sea ice coverage caused by the lowered seawater temperature. In addition, the formation of a strong thermocline in more extensive areas of sea ice coverage led to stronger water column stability, resulting in reduced diatom production due to the reduction in the supply of nutrient-rich subsurface water caused by a decrease in upwelling intensity. Under such environmental circumstances, diatom productivity decreased in the Antarctic Zone during the last glacial period, but the biogenic opal content increased rapidly under warming conditions with the onset of deglaciation.

Keywords
biogenic opal
carbon cycle
paleoceanography
last glacial period
Conrad Rise
Southern Ocean
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Information
  • Publisher :Korea Institute of Ocean Science and Technology
  • Publisher(Ko) :한국해양과학기술원
  • Journal Title :Ocean and Polar Research
  • Journal Title(Ko) :Ocean and Polar Research
  • Volume : 45
  • No :3
  • Pages :141-153
  • Received Date : 2023-03-29
  • Revised Date : 2023-05-27
  • Accepted Date : 2023-06-12
  • DOI :https://doi.org/10.4217/OPR.2023009
Journal Informaiton Ocean and Polar Research Ocean and Polar Research
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