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AGU: Journal of Geophysical Research, Biogeosciences

 

Keywords

  • stable isotopes
  • isotopomers
  • nitrous oxide
  • groundwater
  • soil
  • denitrification
  • modeling

Index Terms

  • Biogeosciences: Biogeochemical cycles, processes, and modeling
  • Biogeosciences: Nitrogen cycling
  • Biogeosciences: Trace gases
  • Biogeosciences: Agricultural systems
  • Biogeosciences: New fields (not classifiable under other headings)
Abstract
Cited By (14)
 

Abstract

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 110, G02006, 13 PP., 2005
doi:10.1029/2005JG000044

Measurement of isotopomer signatures of N2O in groundwater

R. Well

Institute of Soil Science and Forest Nutrition, University of Göttingen, Gottingen, Germany

H. Flessa

Institute of Soil Science and Forest Nutrition, University of Göttingen, Gottingen, Germany

F. Jaradat

Institute of Soil Science, University of Göttingen, Gottingen, Germany

S. Toyoda

Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Tokyo, Japan

N. Yoshida

Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Tokyo, Japan

N2O flux from aquifers caused by leaching of agricultural N is a poorly known component of the global anthropogenic source of this greenhouse gas. We measured isotopomer signatures of N2O (intramolecular distribution of 15N as well as conventional nitrogen and oxygen isotope ratios) in the interface region between shallow groundwater and the atmosphere in order to evaluate this technique for determining fluxes, production, reduction and the isotopomer fingerprint of N2O originating from the saturated zone. 15N-site preference (difference in δ15N between central and peripheral N-position) measured in the shallow groundwater of a hydromorphic soil (29 to 81‰) was distinctly larger compared to surface emitted N2O. Local and global isotopic budget calculations confirmed that the groundwater derived N2O flux of the experimental site was low compared to measured surface fluxes and suggest that 15N-site preference might be useful for validating global estimates of groundwater emitted N2O.

Received 19 April 2005; accepted 14 September 2005; published 15 November 2005.

Citation: Well, R., H. Flessa, F. Jaradat, S. Toyoda, and N. Yoshida (2005), Measurement of isotopomer signatures of N2O in groundwater, J. Geophys. Res., 110, G02006, doi:10.1029/2005JG000044.

Cited By

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