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Pleistocene paleoceanographic changes of the Southern Ocean off the Ross Sea

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Title
Pleistocene paleoceanographic changes of the Southern Ocean off the Ross Sea
Other Titles
남극 로스해의 플라이스토세 고해양학적 변화
Authors
Kim, Sunghan
Lee, Jae Il
Yoo, Kyu-Cheul
Park, Young-Suk
Lee, Min Kyung
Yoon, Ho Il
Issue Date
2018
Citation
Kim, Sunghan, et al. 2018. Pleistocene paleoceanographic changes of the Southern Ocean off the Ross Sea. Polar 2018 Open Science Conference. Davos. 2018.06.19~2018.06.23.
Abstract
A 8.4 m long gravity core RS15-GC107 was collected from a seamount in the Southern Ocean off the Ross Sea (68o04.0741´S, 178o37.9066´W, 3050 m deep). Geochemical proxies (biogenic opal, CaCO3, TOC) and oxygen isotope of planktonic foraminifers (Neogloboquadrina pachyderma (sin.)) were measured in order to reconstruct paleoceanographic changes of the Ross Sea Sector of the Southern Ocean. Because CaCO3 was relatively well preserved in upper 6 m of the core, the age of the upper part was constrained through planktonic foraminifer oxygen isotope correlation to LR-04 stack. CaCO3 became to be preserved from 6.2 m of core RS15-GC107, whereas biogenic opal decreased from this interval. The changes at 6.2 m of core RS15-GC107 most likely corresponded to the beginning of the Mid-Pleistocene Transition (MPT) climate change. This means that the Ross Sea Sector of the Southern Ocean shifted from relatively more siliceous ocean to carbonate ocean during the MPT. Oxygen isotope values became lower during the interglacial periods with larger glacial-interglacial contrast at 1.5 m of the core, ~430 ka, which corresponds to the Mid-Brunhes Event (mWP). Interestingly, glacial planktonic Oxygen isotope values also became relatively lighter from ~430 ka than before. This may suggest that post-mWP glacial periods became more stratified along with increased ice volume.
URI
https://repository.kopri.re.kr/handle/201206/12590
Conference Name
Polar 2018 Open Science Conference
Conference Place
Davos
Conference Date
2018.06.19~2018.06.23
Appears in Collections  
2017-2018, Reconstruction of Antarctic ice sheet and ocean history for the past two million years using sediment records (17-18) / Lee, Min Kyung; Lee, Jae Il (PE17030; PE18030)
2018-2018, Reconstruction of Antarctic ice sheet and ocean history for the past two million years using sediment records (18-18) / Lee, Jae Il (PE18030)
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