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Suzuki, Takashi; Minakawa, Masayuki*; Amano, Hikaru; Togawa, Orihiko
Nuclear Instruments and Methods in Physics Research B, 268, p.1229 - 1231, 2010/04
Times Cited Count：26 Percentile：85.04(Instruments & Instrumentation)no abstracts in English
Tanaka, Takayuki; Otosaka, Shigeyoshi; Wakita, Masahide*; Amano, Hikaru*; Togawa, Orihiko
Nuclear Instruments and Methods in Physics Research B, 268(7-8), p.1219 - 1221, 2010/04
Times Cited Count：9 Percentile：54.12(Instruments & Instrumentation)Dissolved organic carbon (DOC) in seawater is one of the largest reservoirs of organic matter on the earth's surface, holding approximately as much carbon as available in atmospheric CO
. As a result of the huge carbon reservoir, the role and dynamics of DOC have become of greater interest in the global carbon cycle. It has been suggested that dissolved organic radiocarbon (
C-DOC) in seawater is a powerful tool to understand the dynamics of DOC and its researches have been carried out using AMS. However, there are very few data in the world oceans because of the difficulties of the measurement technique. Although it has been represented that the western North Pacific plays an important role in the carbon cycle from the viewpoint of a terminal of the deep water circulation in the world oceans and a high biological activity, C-DOC has not been measured yet. In this study, we obtained its vertical profile in the western North Pacific for the first time.
Aramaki, Takafumi*; Togawa, Orihiko; Watanabe, Shuichi*; Tsunogai, Shizuo*; Taira, Keisuke*
no journal, ,
Radiocarbon data (C) were obtained in a wide range of surface and along the 165 degrees East in the western North Pacific between 1991 and 1993. The variability of C in surface water at north-south direction was larger than that at east-west direction, and C markedly decreased northward in the north of 40 degrees North. Comparing C data along 165 degrees East with the 1973 GEOSECS, it became clear that the bomb-produced C was transported from the surface to the intermediate layer in the sub-tropical region during the last 20 years, and not found in deep water in 1993. The distribution of the bomb-produced C and age of the deep water suggest that the sub-tropical bomb-C increase is caused from considerably storing in the intermediate layer originated in the sub-arctic region taken by vertical mixing and transported the North Pacific Intermediate Water flowing southward.
