Decadal Changes in Bomb-Produced Radiocarbon in the Pacific Ocean from the 1990s to 2000s
In the 2000s, radiocarbon in dissolved inorganic carbon was measured during 7 revisit cruises along the lines of the World Ocean Circulation Experiment in the Pacific Ocean. Comparison of 14 C data along these lines from the 1990s and 2000s revealed decadal changes of 14 C concentration in the therm...
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crcambridgeupr:10.1017/s0033822200048554 2024-05-19T07:49:13+00:00 Decadal Changes in Bomb-Produced Radiocarbon in the Pacific Ocean from the 1990s to 2000s Kumamoto, Yuichiro Murata, Akihiko Kawano, Takeshi Watanabe, Shuichi Fukasawa, Masao 2013 http://dx.doi.org/10.1017/s0033822200048554 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200048554 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Radiocarbon volume 55, issue 3, page 1641-1650 ISSN 0033-8222 1945-5755 journal-article 2013 crcambridgeupr https://doi.org/10.1017/s0033822200048554 2024-05-02T06:50:39Z In the 2000s, radiocarbon in dissolved inorganic carbon was measured during 7 revisit cruises along the lines of the World Ocean Circulation Experiment in the Pacific Ocean. Comparison of 14 C data along these lines from the 1990s and 2000s revealed decadal changes of 14 C concentration in the thermocline, most of which were due to temporal changes in the bomb-produced 14 C. Vertical profiles and vertical-integrated inventories of the bomb 14 C in the subarctic and equatorial regions did not change appreciably. In the southern subtropical region, 14 C decreased in the upper thermocline from the surface to ∼500 m depth. In contrast, 14 C increased in the lower thermocline below ∼500 m depth. The opposing directions in 14 C change resulted in small temporal changes in the total inventory of bomb 14 C. On the other hand, the water-column inventory significantly decreased in the northwestern subtropical region due to the 14 C decrease in the upper thermocline. These decadal changes in bomb 14 C indicate that the turnover time of thermocline circulation in the northwestern subtropical region is faster than that in the southern subtropical region, and imply an interbasin transport of bomb 14 C from the North Pacific to other basins. Article in Journal/Newspaper Subarctic Cambridge University Press Radiocarbon 55 3 1641 1650 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
In the 2000s, radiocarbon in dissolved inorganic carbon was measured during 7 revisit cruises along the lines of the World Ocean Circulation Experiment in the Pacific Ocean. Comparison of 14 C data along these lines from the 1990s and 2000s revealed decadal changes of 14 C concentration in the thermocline, most of which were due to temporal changes in the bomb-produced 14 C. Vertical profiles and vertical-integrated inventories of the bomb 14 C in the subarctic and equatorial regions did not change appreciably. In the southern subtropical region, 14 C decreased in the upper thermocline from the surface to ∼500 m depth. In contrast, 14 C increased in the lower thermocline below ∼500 m depth. The opposing directions in 14 C change resulted in small temporal changes in the total inventory of bomb 14 C. On the other hand, the water-column inventory significantly decreased in the northwestern subtropical region due to the 14 C decrease in the upper thermocline. These decadal changes in bomb 14 C indicate that the turnover time of thermocline circulation in the northwestern subtropical region is faster than that in the southern subtropical region, and imply an interbasin transport of bomb 14 C from the North Pacific to other basins. |
format |
Article in Journal/Newspaper |
author |
Kumamoto, Yuichiro Murata, Akihiko Kawano, Takeshi Watanabe, Shuichi Fukasawa, Masao |
spellingShingle |
Kumamoto, Yuichiro Murata, Akihiko Kawano, Takeshi Watanabe, Shuichi Fukasawa, Masao Decadal Changes in Bomb-Produced Radiocarbon in the Pacific Ocean from the 1990s to 2000s |
author_facet |
Kumamoto, Yuichiro Murata, Akihiko Kawano, Takeshi Watanabe, Shuichi Fukasawa, Masao |
author_sort |
Kumamoto, Yuichiro |
title |
Decadal Changes in Bomb-Produced Radiocarbon in the Pacific Ocean from the 1990s to 2000s |
title_short |
Decadal Changes in Bomb-Produced Radiocarbon in the Pacific Ocean from the 1990s to 2000s |
title_full |
Decadal Changes in Bomb-Produced Radiocarbon in the Pacific Ocean from the 1990s to 2000s |
title_fullStr |
Decadal Changes in Bomb-Produced Radiocarbon in the Pacific Ocean from the 1990s to 2000s |
title_full_unstemmed |
Decadal Changes in Bomb-Produced Radiocarbon in the Pacific Ocean from the 1990s to 2000s |
title_sort |
decadal changes in bomb-produced radiocarbon in the pacific ocean from the 1990s to 2000s |
publisher |
Cambridge University Press (CUP) |
publishDate |
2013 |
url |
http://dx.doi.org/10.1017/s0033822200048554 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200048554 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Radiocarbon volume 55, issue 3, page 1641-1650 ISSN 0033-8222 1945-5755 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0033822200048554 |
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Radiocarbon |
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55 |
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3 |
container_start_page |
1641 |
op_container_end_page |
1650 |
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1799467679790137344 |