富山湾海底湧水の化学成分の特徴と起源 : 栄養塩と溶存有機物(<特集>沿岸海底湧水の地球科学)

概要

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Nitrite+nitrate, phosphate, silicic acid and dissolved organic carbon (DOC) in the submarine groundwater discharge (S.G.D.) and the bottom water (upper 10-50 cm from the bottom) in Toyama Bay were observed. The concentrations of nitrite+nitrate and silicic acid in S.G.D. were approximately 60 and 30 times, respectively, higher than those in the bottom water. Nitrite+nitrate, phosphate and silicic acid in groundwater under an alluvial fan of Katagai River and Kurobe River were also determined. The residence time for groundwater is estimated to be long due to the high silicic acid concentration. The ratio of silicic acid/nitrite+nitrate showed that the route and origin of S.G.D. from groundwater under an alluvial fan of Katagai River. The characteristics of DOC in S.G.D. were investigated by three-dimensional excitation emission matrix spectroscopy. The fluorescent peaks which derived from humic-like and tryptophan-like substances were recognized in the bottom water. The typical fluorescent peak could not be recognized in the S.G.D. have been reported. The flux of nitrite+nitrate, phosphate and silicic acid into Toyama Bay by S.G.D. were estimated to be 2,290±700, 22±20 and 22,900±10,400 ton/year, respectively.
日本地球化学会の論文
2005-08-20