Paleoceanographic changes in the Drake Passage over the past 600 kyrs
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Title
- Paleoceanographic changes in the Drake Passage over the past 600 kyrs
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Author(s)
- Kim,Sunghan; Lee, Jae Il; Yoo, Kyu-Cheul; Lee, Min Kyung; Bak, Young-Suk; Kang, Myung-Il; Kim, Sookwan; Park, Jinku
- KIOST Author(s)
- Kim, Sookwan(김수관)
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Alternative Author(s)
- 김수관
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Publication Year
- 2023-09-11
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Abstract
- Oceanographic conditions in the Southern Ocean are closely associated with the oceanic frontal
system. Glacial-interglacial changes in cryosphere influence variations in oceanic fronts in the
Southern Ocean and vice versa, causing oceanographic changes from surface to bottom including
surface water productivity, nutrient utilization, bottom water chemistry, and bottom current
intensity and changes in sediment provenance and sediment transport mechanisms. Here, we
documented various multi-proxy records over the past 600 kyrs from the Drake Passage with
previously published data to compare between glacial and interglacial oceanic conditions from
surface to bottom. Biogenic opal (diatom) and export productions were high during interglacial
periods and low during glacial periods. Surface water production was dominated by open ocean
diatom species during both glacial and interglacial periods without a clear glacial-interglacial
change in sea ice species. From Marine Isotope Stage (MIS) 9, interglacial biogenic opal and
diatom abundance increased with decreased terrestrial influence. Nutrient utilization increased
(decreased) during interglacial (glacial) periods with increased (decreased) surface water
production, particularly after MIS 9. This indicates that surface water production was regulated by
light availability in association with mixed layer depth. Sortable silt mean grain size increased
(decreased) bottom current during glacial (interglacial) periods. Increased glacial bottom current
is likely associated with southwestward flowing bottom current. Interglacial bottom current
intensity became significantly weakened after MIS 9. Distinct interglacial warmth in the Drake
Passage occurred from MIS 9, not following the global trend to occur after MIS 11. This implies
that more studies from the Southern Ocean in response to the MBE are required in the future.
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/44809
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Bibliographic Citation
- INSTANT Conference 2023, 2023
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Publisher
- Scientific Committee on Antarctic Research (SCAR)
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Type
- Conference
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Language
- English
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