Reconstruction of Oceanographic Changes Based on the Diatom Records of the Central Okhotsk Sea over the last 500000 Years
This study provides insight into changes in sea ice conditions and the oceanographic environment over the past 500 kyr through analysis of the diatom record. Based on the relative abundance of 13 diatoms species in piston core MD012414, four types of environmental conditions in the central Okhotsk S...
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ftchanghuauniedu:oai:localhost:987654321/15627 2023-05-15T17:52:31+02:00 Reconstruction of Oceanographic Changes Based on the Diatom Records of the Central Okhotsk Sea over the last 500000 Years Wang, Wei-Lung; Wang, Liang-Chi 生物學系 2008-08 101 bytes text/html http://ir.ncue.edu.tw/ir/handle/987654321/15627 en en_US eng TAO Terr. Atmos. Ocean. Sci., 19(4): 403-411 http://ir.ncue.edu.tw/ir/handle/987654321/15627 Diatom indicator;Okhotsk Sea;Sea-ice;Paleoenvironment 43 2008 ftchanghuauniedu 2020-04-10T17:39:51Z This study provides insight into changes in sea ice conditions and the oceanographic environment over the past 500 kyr through analysis of the diatom record. Based on the relative abundance of 13 diatoms species in piston core MD012414, four types of environmental conditions in the central Okhotsk Sea over the last 330 ka BP have been distinguished: (1) open-ocean alternating with seasonal sea-ice cover in Stages 9, 5, and 1; (2) almost open-ocean free of sea-ice cover in Stages 7 and 3; (3) perennial sea-ice cover in Stages 6, 4, and 2; and (4) a warm ice-age dominated by open ocean assemblages in Stage 8. The littoral diatom species, Paralia sulcata, showed a sudden increase from the glacial period to the interglacial period over the last 330 ka BP, except during Stage 8. Such a result implies that melting sea-ice transported terrigenous materials from the north Okhotsk Sea continental shelves to the central ocean during deglaciation. From Stage 13 to Stage 10, however, cold and warm marine conditions unexpectedly occurred in the late interglacial periods and the glacial periods, respectively. One possible reason for this is a lack of age control points from Stage 13 to Stage 10, and the different sediment accumulation rates between glacial and interglacial periods. This study suggests not only the process by which oceanographic variation of sea ice occurred, but also new significance for Paralia sulcata as an indicator in the diatom record of the Okhotsk Sea. Other/Unknown Material okhotsk sea Sea ice National Changhua University of Education Institutional Repository Okhotsk |
institution |
Open Polar |
collection |
National Changhua University of Education Institutional Repository |
op_collection_id |
ftchanghuauniedu |
language |
English |
topic |
Diatom indicator;Okhotsk Sea;Sea-ice;Paleoenvironment 43 |
spellingShingle |
Diatom indicator;Okhotsk Sea;Sea-ice;Paleoenvironment 43 Wang, Wei-Lung; Wang, Liang-Chi Reconstruction of Oceanographic Changes Based on the Diatom Records of the Central Okhotsk Sea over the last 500000 Years |
topic_facet |
Diatom indicator;Okhotsk Sea;Sea-ice;Paleoenvironment 43 |
description |
This study provides insight into changes in sea ice conditions and the oceanographic environment over the past 500 kyr through analysis of the diatom record. Based on the relative abundance of 13 diatoms species in piston core MD012414, four types of environmental conditions in the central Okhotsk Sea over the last 330 ka BP have been distinguished: (1) open-ocean alternating with seasonal sea-ice cover in Stages 9, 5, and 1; (2) almost open-ocean free of sea-ice cover in Stages 7 and 3; (3) perennial sea-ice cover in Stages 6, 4, and 2; and (4) a warm ice-age dominated by open ocean assemblages in Stage 8. The littoral diatom species, Paralia sulcata, showed a sudden increase from the glacial period to the interglacial period over the last 330 ka BP, except during Stage 8. Such a result implies that melting sea-ice transported terrigenous materials from the north Okhotsk Sea continental shelves to the central ocean during deglaciation. From Stage 13 to Stage 10, however, cold and warm marine conditions unexpectedly occurred in the late interglacial periods and the glacial periods, respectively. One possible reason for this is a lack of age control points from Stage 13 to Stage 10, and the different sediment accumulation rates between glacial and interglacial periods. This study suggests not only the process by which oceanographic variation of sea ice occurred, but also new significance for Paralia sulcata as an indicator in the diatom record of the Okhotsk Sea. |
author2 |
生物學系 |
author |
Wang, Wei-Lung; Wang, Liang-Chi |
author_facet |
Wang, Wei-Lung; Wang, Liang-Chi |
author_sort |
Wang, Wei-Lung; Wang, Liang-Chi |
title |
Reconstruction of Oceanographic Changes Based on the Diatom Records of the Central Okhotsk Sea over the last 500000 Years |
title_short |
Reconstruction of Oceanographic Changes Based on the Diatom Records of the Central Okhotsk Sea over the last 500000 Years |
title_full |
Reconstruction of Oceanographic Changes Based on the Diatom Records of the Central Okhotsk Sea over the last 500000 Years |
title_fullStr |
Reconstruction of Oceanographic Changes Based on the Diatom Records of the Central Okhotsk Sea over the last 500000 Years |
title_full_unstemmed |
Reconstruction of Oceanographic Changes Based on the Diatom Records of the Central Okhotsk Sea over the last 500000 Years |
title_sort |
reconstruction of oceanographic changes based on the diatom records of the central okhotsk sea over the last 500000 years |
publisher |
TAO |
publishDate |
2008 |
url |
http://ir.ncue.edu.tw/ir/handle/987654321/15627 |
geographic |
Okhotsk |
geographic_facet |
Okhotsk |
genre |
okhotsk sea Sea ice |
genre_facet |
okhotsk sea Sea ice |
op_relation |
Terr. Atmos. Ocean. Sci., 19(4): 403-411 http://ir.ncue.edu.tw/ir/handle/987654321/15627 |
_version_ |
1766160031645958144 |