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AGU: Geophysical Research Letters

 

Index Terms

  • Atmospheric Composition and Structure: Air/sea constituent fluxes
  • Global Change: Biogeochemical processes
  • Oceanography: Biological and Chemical: Gases
  • Oceanography: Biological and Chemical: Stable isotopes
  • Information Related to Geographic Region: Pacific Ocean

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 29, 1037, 4 PP., 2002
doi:10.1029/2001GL014311

Production mechanism and global budget of N2O inferred from its isotopomers in the western North Pacific

Sakae Toyoda

Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Japan

Naohiro Yoshida

Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Japan

Tatsuya Miwa

Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Japan

Yohei Matsui

Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Japan

Hiroaki Yamagishi

Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Japan

Urumu Tsunogai

Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Japan

Yukihiro Nojiri

National Institute for Environmental Studies, Japan

Nobuo Tsurushima

National Institute of Advanced Industrial Science and Technology, Japan

We measured the intramolecular distribution of 15N as well as conventional nitrogen and oxygen isotope ratios in oceanic nitrous oxide (N2O) in the western North Pacific for the first time. In contrast to a nearly homogeneous vertical distribution of a bulk nitrogen isotope ratio, a wide variation in site preference for intramolecular 15N distribution was found, suggesting the subsurface and deep source mixing and the production mechanism in the ocean. The oceanic composition of N2O isotopomers quantitatively outlines the ocean as the most significant source after the terrestrial one.

Published 15 February 2002.

Citation: Toyoda, S., N. Yoshida, T. Miwa, Y. Matsui, H. Yamagishi, U. Tsunogai, Y. Nojiri, and N. Tsurushima (2002), Production mechanism and global budget of N2O inferred from its isotopomers in the western North Pacific, Geophys. Res. Lett., 29(3), 1037, doi:10.1029/2001GL014311.

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