Spatial Distribution of Submarine Groundwater Discharge and Associated Nutrients within a Local Coastal Area
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- Takahiro Hosono
- Priority Organization for Innovation and Excellence, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
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- Masahiko Ono
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
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- William C. Burnett
- Department of Earth, Ocean and Atmospheric Sciences, Florida State University, 117 North Woodward Avenue, Tallahassee, Florida 32306, United States
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- Takahiro Tokunaga
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
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- Makoto Taniguchi
- Research Institute for Humanity and Nature, 457-4 Motoyama Kamigamo, Kita-ku, Kyoto 603-8047, Japan
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- Tomoya Akimichi
- Research Institute for Humanity and Nature, 457-4 Motoyama Kamigamo, Kita-ku, Kyoto 603-8047, Japan
書誌事項
- 公開日
- 2012-04-26
- DOI
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- 10.1021/es2043867
- 公開者
- American Chemical Society (ACS)
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説明
To understand the local-scale distribution of submarine groundwater discharge (SGD) and dissolved nutrients, a multiple-detector (222)Rn monitoring survey was undertaken along the Mt. Chokai volcanic coast in northern Japan. The surveys revealed that the highest SGD (calculated to be 6.2 × 10(4) m(3) d(-1), within an area of 2 × 10(4) m(2)) with the greatest nutrient fluxes (sum of NO(3)(-), NO(2)(-), and NH(4)(+) (DIN): 9.2 × 10(2) mol d(-1); PO(4)(3-) (DIP): 56 mol d(-1)) is present at the edge of the youngest volcanic lava flow in the area. Recharged groundwater transports nutrients through porous volcanic flows and discharges as SGD near shore. Our results demonstrate that the spatial distribution of SGD in the study area is closely regulated by the local geology and topography. Furthermore, we show that continuous (222)Rn monitoring with a multidetector system at boat speeds of 1-2 knots provides details at a scale one order of magnitude greater than has been reported previously. In addition, the results of our study suggest that SGD-borne DIP may play an important role in the important local oyster production.
収録刊行物
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- Environmental Science & Technology
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Environmental Science & Technology 46 (10), 5319-5326, 2012-04-26
American Chemical Society (ACS)