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AGU: Journal of Geophysical Research, Atmospheres

 

Keywords

  • nitrous oxide
  • isotope
  • firn

Index Terms

  • Atmospheric Composition and Structure: Aerosols and particles
  • Atmospheric Composition and Structure: Constituent sources and sinks
  • Atmospheric Composition and Structure: Evolution of the atmosphere
  • Atmospheric Composition and Structure: Troposphere: composition and chemistry
Abstract
Cited By (4)
 

Abstract

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 112, D03305, 12 PP., 2007
doi:10.1029/2006JD007208

Temporal variations of the atmospheric nitrous oxide concentration and its δ15N and δ18O for the latter half of the 20th century reconstructed from firn air analyses

Kentaro Ishijima

Center for Atmospheric and Oceanic Studies, Tohoku University, Sendai, Japan

Satoshi Sugawara

Institute of Earth Science, Miyagi University of Education, Sendai, Japan

Kenji Kawamura

Scripps Institution of Oceanography, University of California, San Diego, USA

Gen Hashida

National Institute of Polar Research, Tokyo, Japan

Shinji Morimoto

National Institute of Polar Research, Tokyo, Japan

Shohei Murayama

National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

Shuji Aoki

Center for Atmospheric and Oceanic Studies, Tohoku University, Sendai, Japan

Takakiyo Nakazawa

Center for Atmospheric and Oceanic Studies, Tohoku University, Sendai, Japan

Histories of atmospheric N2O concentration and its δ 15N and δ 18O were reconstructed for the period 1952–2001 on the basis of the analyses of firn air collected at the North Greenland Ice Core Project (NGRIP), Greenland, and Dome Fuji and H72, Antarctica. The N2O concentration increased from 290 ppbv in 1952 to 316 ppbv in 2001, which agrees well with the results from atmospheric observations and polar ice core analyses. The δ 15N and δ 18O showed a secular decrease, the respective values being 8.9 and 21.5‰ in 1952 and 7.0 and 20.5‰ in 2001. Their rates of change also varied, from about −0.02‰ yr−1 in the 1950s to about −0.04‰ yr−1 in 1960–2001 for δ 15N, and from about 0‰ yr−1 to −0.02‰ yr−1 for δ 18O. The isotopic budgetary calculations using a two-box model indicated that anthropogenic N2O emission from soils played a main role in the atmospheric N2O increase after industrialization, as well as that the average isotopic ratio of anthropogenic N2O has potentially been changed temporally.

Received 22 February 2006; accepted 1 August 2006; published 10 February 2007.

Citation: Ishijima, K., S. Sugawara, K. Kawamura, G. Hashida, S. Morimoto, S. Murayama, S. Aoki, and T. Nakazawa (2007), Temporal variations of the atmospheric nitrous oxide concentration and its δ15N and δ18O for the latter half of the 20th century reconstructed from firn air analyses, J. Geophys. Res., 112, D03305, doi:10.1029/2006JD007208.

Cited By

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