Articles | Volume 14, issue 4
Research article
13 Jul 2018
Research article |  | 13 Jul 2018

Hadal water biogeochemistry over the Izu–Ogasawara Trench observed with a full-depth CTD-CMS

Shinsuke Kawagucci, Akiko Makabe, Taketoshi Kodama, Yohei Matsui, Chisato Yoshikawa, Etsuro Ono, Masahide Wakita, Takuro Nunoura, Hiroshi Uchida, and Taichi Yokokawa

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Cited articles

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Beman, J. M., Cheryl-Emiliane, C., King, A. L., Feng, Y., Fuhrman, J. A., Andersson, A., Bates, N. R., Popp, B. N., and Hutchins, D. A.: Global declines in oceanic nitrification rates as a consequence of ocean acidification, P. Natl. Acad. Sci. USA, 108, 208–213,, 2011. 
Böhlke, J. K., Mroczkowski, S. J., and Coplen, T. B.: Oxygen isotopes in nitrate: new reference materials for 18O: 17O: 16O measurements and observations on nitrate-water equilibration, Rapid Commun. Mass Sp., 17, 1835–1846,, 2003. 
Casciotti, K. L.: Nitrogen and Oxygen Isotopic Studies of the Marine Nitrogen Cycle, Annu. Rev. Mar. Sci., 8, 379–407,, 2016. 
Short summary
A full-depth-rated conductivity–temperature–depth profiler with carousel~multiple sampling (CTD-CMS) system on the research vessel R/V Kaimei can illuminate the last frontier, i.e., the hadal zone, an oceanographic province deeper than 7000 m. A series of biogeochemical observations of hadal seawater at the Izu–Ogasawara and Mariana trenches revealed basically well-mixed hydrographic properties and a heterogeneous distribution of likely sediment-derived compounds.