The Last Glacial World Estimated from the North Pacific Deep-sea Cores.
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- OBA Tadamichi
- Graduate School of Environmental Earth Science, Hokkaido University
Bibliographic Information
- Other Title
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- 北太平洋の深海底コアから推測される最終氷期の世界
- キタ タイヘイヨウ ノ シンカイテイ コア カラ スイソクサレル サイシュウ
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Abstract
Comparing mutually the records of several deep-sea cores from the North Pacific, it is concluded that glacial ages had high accumulation rate of organic carbon and weak carbonate dissolution rate than interglacial ages. However, the increase of biological productivity in surface water generally causes the drop of the pH of the underlying water and leads to high carbonate dissolution. A key to solve this contradiction is probably carbonate particles in aeolian dust which were extensively supplied to the entire ocean during glacial ages. By dissolving the carbonate particles in water column, the alkalinity of the sea water increased. Hence the atmospheric CO2 was absorbed by the upwelling water with high alkalinity, as well as by the photosynthesis of marine plankton increased during glacial ages. The variation of atmospheric CO2 concentration is not related to the deep water circulation but to the conditions of the surface and middle layers in the ocean.
Journal
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- Journal of Geography (Chigaku Zasshi)
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Journal of Geography (Chigaku Zasshi) 103 (7), 853-860, 1994
Tokyo Geographical Society
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Keywords
Details 詳細情報について
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- CRID
- 1390001204230642944
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- NII Article ID
- 10007193469
- 10003565996
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- NII Book ID
- AN00322536
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- ISSN
- 18840884
- 0022135X
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- NDL BIB ID
- 3595891
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed