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...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Chinese Geoscience Union
2008
|
Subjects: | |
Online Access: | https://archimer.ifremer.fr/doc/00237/34819/33683.pdf https://doi.org/10.3319/TAO.2008.19.4.403(IMAGES https://archimer.ifremer.fr/doc/00237/34819/ |
id |
ftarchimer:oai:archimer.ifremer.fr:34819 |
---|---|
record_format |
openpolar |
spelling |
ftarchimer:oai:archimer.ifremer.fr:34819 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 2008-08 application/pdf https://archimer.ifremer.fr/doc/00237/34819/33683.pdf https://doi.org/10.3319/TAO.2008.19.4.403(IMAGES https://archimer.ifremer.fr/doc/00237/34819/ eng eng Chinese Geoscience Union https://archimer.ifremer.fr/doc/00237/34819/33683.pdf doi:10.3319/TAO.2008.19.4.403(IMAGES) https://archimer.ifremer.fr/doc/00237/34819/ info:eu-repo/semantics/openAccess restricted use Terrestrial Atmospheric And Oceanic Sciences (1017-0839) (Chinese Geoscience Union), 2008-08 , Vol. 19 , N. 4 , P. 403-411 diatom indicator Okhotsk Sea sea-ice paleoenvironment text Publication info:eu-repo/semantics/article 2008 ftarchimer https://doi.org/10.3319/TAO.2008.19.4.403(IMAGES 2021-09-23T20:25:26Z 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. Article in Journal/Newspaper okhotsk sea Sea ice Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Okhotsk |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
diatom indicator Okhotsk Sea sea-ice paleoenvironment |
spellingShingle |
diatom indicator Okhotsk Sea sea-ice paleoenvironment 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 |
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. |
format |
Article in Journal/Newspaper |
author |
Wang, Wei-lung Wang, Liang-chi |
author_facet |
Wang, Wei-lung Wang, Liang-chi |
author_sort |
Wang, Wei-lung |
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 |
Chinese Geoscience Union |
publishDate |
2008 |
url |
https://archimer.ifremer.fr/doc/00237/34819/33683.pdf https://doi.org/10.3319/TAO.2008.19.4.403(IMAGES https://archimer.ifremer.fr/doc/00237/34819/ |
geographic |
Okhotsk |
geographic_facet |
Okhotsk |
genre |
okhotsk sea Sea ice |
genre_facet |
okhotsk sea Sea ice |
op_source |
Terrestrial Atmospheric And Oceanic Sciences (1017-0839) (Chinese Geoscience Union), 2008-08 , Vol. 19 , N. 4 , P. 403-411 |
op_relation |
https://archimer.ifremer.fr/doc/00237/34819/33683.pdf doi:10.3319/TAO.2008.19.4.403(IMAGES) https://archimer.ifremer.fr/doc/00237/34819/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.3319/TAO.2008.19.4.403(IMAGES |
_version_ |
1766160031984648192 |