Stable carbon isotope ratio of suspended particulate and sedimentary organic matter during the summer blooming in Tokyo Bay

• OGAWA Hiroshi

  Department of Environmental Science & Conservation, Faculty of Agriculture, Tokyo University of Agriculture & Technology (Present address) Ocean Research Institute, University of Tokyo

• AOKI Nobuhiro

  Tokyo Kyuei Co., Ltd.: (Present address) Suidosha Co., Ltd.

• KON Isoharu

  Tokyo Kyuei Co., Ltd.: (Present address) Suidosha Co., Ltd.

• OGURA Norio

  Department of Environmental Science & Conservation, Faculty of Agriculture, Tokyo University of Agriculture & Technology

Bibliographic Information

Other Title

• 夏季の東京湾における懸濁態および堆積有機物の炭素安定同位体比
• カキ ノ トウキョウワン ニ オケル ケンダクタイ オヨビ タイセキ ユウキブ

Abstract

The carbon isotopic characteristics (δ¹³C) of particulate organic matter during the summer blooming in Tokyo Bay have been investigated. The δ¹³C of suspended particulate organic matter (POM) in the surface seawater ranged from -15.4‰ to -4.5‰, which were considerably higher than the value generally known of planktonic organic matter (-20±1‰), suggesting that actively growing phytoplankton might be subjected to such a condition that the diffusion rate of CO₂ might strongly limit the production of organic carbon. However, the isotope ratios of surfacial sedimentary organic matter ranged from -20.4‰ to -18.1‰, which were lower than those of POM. The δ¹³C of sinking organic particles collected in sediment traps were similar to those of POM. Therefore, the ¹³C-enriched isotope characteristics produced during summer phytoplankton blooming might be unlikely to be conserved in the sediments, possibly, by being mixed with terrestrial organic matter depleted in ¹³C, and/or, being rapidly decomposed during their sedimentation process. In conclusion, it was strongly suggested that properly determining the marine-endmember of δ¹³C should be important if the δ¹³C would be principally used to estimate contributions of terrestrially and in situ produced organic matter in such an exceedingly eutrophic coastal area as Tokyo Bay.

Journal

• Chikyukagaku

  Chikyukagaku 28 (1), 21-36, 1994-03-24

  The Geochemical Society of Japan

Keywords

• carbon isotope ratio
• particulate organic matter
• sediment source
• Tokyo Bay

Details

• CRID: 1390282680718617088
• NII Article ID: 20000801244
• NII Article ID: 110008679886
• NII Book ID: AN00141280
• DOI: 10.14934/chikyukagaku.28.21
• ISSN: 21885923
• ISSN: 03864073
• NDL BIB ID: 3875614
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3875614
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
• Abstract License Flag: Disallowed