Temporal variation in dissolved oxygen concentration in the bottom layer in the innermost of Tokyo Bay (2003−2008)
In Tokyo Bay, because of the huge amount of organic matter, nitrogen, and phosphorus, loaded from land, as well as the semienclosed shape of the bay that prevents watermass exchange with the adjacent open ocean, eutrophication such as red tides and hypoxia is a chronic problem. Japan Coast Guard has carried out continuous monitoring of various environmental parameters of Tokyo Bay at the monitoring post at Chiba Light from 2003, as part of “Tokyo Bay Renaissance Project”. We report the data from 2003 to 2008 obtained at the monitoring post in this paper, showing a good correlation between the temporal variation in dissolved oxygen (DO) and that in intensity of stratification. We then estimate the effect of the policy to improve the water quality of Tokyo Bay by removing the influence of natural phenomena such as annual variation in the climate. Removing the influence of the temporal variation in intensity of stratification from that in bottom DO, it is suggested that bottom DO tends to have increased slightly in Tokyo Bay during the study period.
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Format: | Journal Contribution biblioteca |
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2010
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Online Access: | http://hdl.handle.net/1834/15691 |
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dig-aquadocs-1834-156912021-05-19T06:56:14Z Temporal variation in dissolved oxygen concentration in the bottom layer in the innermost of Tokyo Bay (2003−2008) Watanabe, Naoko Yamao, Sstoshi In Tokyo Bay, because of the huge amount of organic matter, nitrogen, and phosphorus, loaded from land, as well as the semienclosed shape of the bay that prevents watermass exchange with the adjacent open ocean, eutrophication such as red tides and hypoxia is a chronic problem. Japan Coast Guard has carried out continuous monitoring of various environmental parameters of Tokyo Bay at the monitoring post at Chiba Light from 2003, as part of “Tokyo Bay Renaissance Project”. We report the data from 2003 to 2008 obtained at the monitoring post in this paper, showing a good correlation between the temporal variation in dissolved oxygen (DO) and that in intensity of stratification. We then estimate the effect of the policy to improve the water quality of Tokyo Bay by removing the influence of natural phenomena such as annual variation in the climate. Removing the influence of the temporal variation in intensity of stratification from that in bottom DO, it is suggested that bottom DO tends to have increased slightly in Tokyo Bay during the study period. Published 2019-10-18T11:18:46Z 2019-10-18T11:18:46Z 2010 Journal Contribution Refereed http://hdl.handle.net/1834/15691 ja https://www1.kaiho.mlit.go.jp/GIJUTSUKOKUSAI/KENKYU/report/article.html#rhr46 pp. 125-131 |
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In Tokyo Bay, because of the huge amount of organic matter, nitrogen, and phosphorus, loaded from land, as well as the semienclosed shape of the bay that prevents watermass exchange with the adjacent open ocean, eutrophication such as red tides and hypoxia is a chronic problem. Japan Coast Guard has carried out continuous monitoring of various environmental parameters of Tokyo Bay at the monitoring post at Chiba Light from 2003, as part of “Tokyo Bay Renaissance Project”. We report the data from 2003 to 2008 obtained at the monitoring post in this paper, showing a good correlation between the temporal variation in dissolved oxygen (DO) and that in intensity of stratification. We then estimate the effect of the policy to improve the water quality of Tokyo Bay by removing the influence of natural phenomena such as annual variation in the climate. Removing the influence of the temporal variation in intensity of stratification from that in bottom DO, it is suggested that bottom DO tends to have increased slightly in Tokyo Bay during the study period. |
format |
Journal Contribution |
author |
Watanabe, Naoko Yamao, Sstoshi |
spellingShingle |
Watanabe, Naoko Yamao, Sstoshi Temporal variation in dissolved oxygen concentration in the bottom layer in the innermost of Tokyo Bay (2003−2008) |
author_facet |
Watanabe, Naoko Yamao, Sstoshi |
author_sort |
Watanabe, Naoko |
title |
Temporal variation in dissolved oxygen concentration in the bottom layer in the innermost of Tokyo Bay (2003−2008) |
title_short |
Temporal variation in dissolved oxygen concentration in the bottom layer in the innermost of Tokyo Bay (2003−2008) |
title_full |
Temporal variation in dissolved oxygen concentration in the bottom layer in the innermost of Tokyo Bay (2003−2008) |
title_fullStr |
Temporal variation in dissolved oxygen concentration in the bottom layer in the innermost of Tokyo Bay (2003−2008) |
title_full_unstemmed |
Temporal variation in dissolved oxygen concentration in the bottom layer in the innermost of Tokyo Bay (2003−2008) |
title_sort |
temporal variation in dissolved oxygen concentration in the bottom layer in the innermost of tokyo bay (2003−2008) |
publishDate |
2010 |
url |
http://hdl.handle.net/1834/15691 |
work_keys_str_mv |
AT watanabenaoko temporalvariationindissolvedoxygenconcentrationinthebottomlayerintheinnermostoftokyobay20032008 AT yamaosstoshi temporalvariationindissolvedoxygenconcentrationinthebottomlayerintheinnermostoftokyobay20032008 |
_version_ |
1756076725464203264 |