Study on Regional Characteristics of Dissolved Organic Carbon and Marine Humic Like Substances in the Ocean

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  • 海洋における溶存有機炭素および海洋腐植様物質の海域特性に関する研究
  • カイヨウ ニ オケル ヨウゾン ユウキ タンソ オヨビ カイヨウ フショク ヨウ ブッシツ ノ カイイキ トクセイ ニ カンスル ケンキュウ

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Abstract

Seawater samples were collected in the western North Pacific, the Indian Ocean (Andaman Sea and Bay of Bengal), the Sea of Japan and the Sea of Okhotsk to find levels of dissolved organic carbon (DOC) and to analyze the three-dimensional excitation emission matrix spectrum. The DOC concentrations bellow 1000 m depth showed significantly different distribution. In the Sea of Japan, the mean concentration of DOC below 1000 m was higher, but in the other regions it was approximately the same concentration range. Fluorescent organic matter such as marine humic-like substances constituted 5 to 15% of DOC in the surface layer and 20 to 37% in the deep layer. The results show characteristics of the ocean regions, such as the difference in the nature of dissolved organic matter (DOM) or the existence of different production and decomposition processes of DOM in each ocean region.

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