IODP Expedition 323—Pliocene and Pleistocene Paleoceanographic Changes in the Bering Sea
High-resolution paleoceanography of the Plio-Pleistocene is important in understanding climate forcing mechanisms and the associated environmental changes. This is particularly true in high-latitude marginal seas such as the Bering Sea, which has been very sensitive to changes in global climate duri...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2011-03-01
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| Series: | Scientific Drilling |
| Subjects: | |
| Online Access: | http://www.iodp.org/index.php?option=com_docman&task=doc_download&gid=3144 |
| _version_ | 1828496967739637760 |
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| author | Carlos Alvarez Zarikian A. Christina Ravelo Kozo Takahashi the IODP Expedition 323 Scientists |
| author_facet | Carlos Alvarez Zarikian A. Christina Ravelo Kozo Takahashi the IODP Expedition 323 Scientists |
| author_sort | Carlos Alvarez Zarikian |
| collection | DOAJ |
| description | High-resolution paleoceanography of the Plio-Pleistocene is important in understanding climate forcing mechanisms and the associated environmental changes. This is particularly true in high-latitude marginal seas such as the Bering Sea, which has been very sensitive to changes in global climate during interglacial and glacial or Milankovitch time scales. This is due to significant changes in water circulation, land-ocean interaction, and sea-ice formation. With theaim to reveal the climate and oceanographic history of the Bering Sea over the past 5 Ma, Integrated Ocean Drilling Program (IODP) Expedition 323 cored a total of 5741 meters of sediment (97.4% recovery) at seven sites covering three different areas: Umnak Plateau, Bowers Ridge, and the Bering slope region. Four deep holes range from 600 m to 745 m spanning in age from 1.9 Ma to 5 Ma. The water depths (819 m to 3173 m) allow characterization of past verticalwater mass distribution such as the oxygen minimum zone (OMZ). The results highlight three key points. (1) The first is an understanding of long-term evolution of surface-water mass distribution during the past 5 Ma including past sea-ice distribution and warm and less eutrophic subarctic Pacific water mass entry into the Bering Sea. (2) We characterized relatively stagnant intermediate water mass distribution imprinted as laminated sediment intervals that have beenubiquitously encountered. Today, the OMZ impinges upon the sediments at ~700–1600 m water depths. In the past, the OMZ appears to have occurred mainly during interglacial periods. Changes in low oxygen-tolerant benthic foraminiferal faunas clearly concur with this observation. (3) We also characterized significant changes between glacial episode of terrigenous sedimentary supply and interglacialepisode of diatom flux. |
| first_indexed | 2024-12-11T12:39:09Z |
| format | Article |
| id | doaj.art-4bc0596b575f4aa3b2556bf3b09ac004 |
| institution | Directory Open Access Journal |
| issn | 1816-8957 1816-3459 |
| language | English |
| last_indexed | 2024-12-11T12:39:09Z |
| publishDate | 2011-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Scientific Drilling |
| spelling | doaj.art-4bc0596b575f4aa3b2556bf3b09ac0042022-12-22T01:07:01ZengCopernicus PublicationsScientific Drilling1816-89571816-34592011-03-011141310.2204/iodp.sd.11.01.2011IODP Expedition 323—Pliocene and Pleistocene Paleoceanographic Changes in the Bering SeaCarlos Alvarez ZarikianA. Christina RaveloKozo Takahashithe IODP Expedition 323 ScientistsHigh-resolution paleoceanography of the Plio-Pleistocene is important in understanding climate forcing mechanisms and the associated environmental changes. This is particularly true in high-latitude marginal seas such as the Bering Sea, which has been very sensitive to changes in global climate during interglacial and glacial or Milankovitch time scales. This is due to significant changes in water circulation, land-ocean interaction, and sea-ice formation. With theaim to reveal the climate and oceanographic history of the Bering Sea over the past 5 Ma, Integrated Ocean Drilling Program (IODP) Expedition 323 cored a total of 5741 meters of sediment (97.4% recovery) at seven sites covering three different areas: Umnak Plateau, Bowers Ridge, and the Bering slope region. Four deep holes range from 600 m to 745 m spanning in age from 1.9 Ma to 5 Ma. The water depths (819 m to 3173 m) allow characterization of past verticalwater mass distribution such as the oxygen minimum zone (OMZ). The results highlight three key points. (1) The first is an understanding of long-term evolution of surface-water mass distribution during the past 5 Ma including past sea-ice distribution and warm and less eutrophic subarctic Pacific water mass entry into the Bering Sea. (2) We characterized relatively stagnant intermediate water mass distribution imprinted as laminated sediment intervals that have beenubiquitously encountered. Today, the OMZ impinges upon the sediments at ~700–1600 m water depths. In the past, the OMZ appears to have occurred mainly during interglacial periods. Changes in low oxygen-tolerant benthic foraminiferal faunas clearly concur with this observation. (3) We also characterized significant changes between glacial episode of terrigenous sedimentary supply and interglacialepisode of diatom flux.http://www.iodp.org/index.php?option=com_docman&task=doc_download&gid=3144IODP Expedition 323 |
| spellingShingle | Carlos Alvarez Zarikian A. Christina Ravelo Kozo Takahashi the IODP Expedition 323 Scientists IODP Expedition 323—Pliocene and Pleistocene Paleoceanographic Changes in the Bering Sea Scientific Drilling IODP Expedition 323 |
| title | IODP Expedition 323—Pliocene and Pleistocene Paleoceanographic Changes in the Bering Sea |
| title_full | IODP Expedition 323—Pliocene and Pleistocene Paleoceanographic Changes in the Bering Sea |
| title_fullStr | IODP Expedition 323—Pliocene and Pleistocene Paleoceanographic Changes in the Bering Sea |
| title_full_unstemmed | IODP Expedition 323—Pliocene and Pleistocene Paleoceanographic Changes in the Bering Sea |
| title_short | IODP Expedition 323—Pliocene and Pleistocene Paleoceanographic Changes in the Bering Sea |
| title_sort | iodp expedition 323 pliocene and pleistocene paleoceanographic changes in the bering sea |
| topic | IODP Expedition 323 |
| url | http://www.iodp.org/index.php?option=com_docman&task=doc_download&gid=3144 |
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