Atmospheric Science

Isotopic composition of Antarctic Dry Valley nitrate: Implications for NOy sources and cycling in Antarctica

  1. G. Michalski1,2,
  2. J. G. Bockheim3,
  3. C. Kendall4,
  4. M. Thiemens2

Article first published online: 9 JUL 2005

DOI: 10.1029/2004GL022121

Issue

Geophysical Research Letters

Geophysical Research Letters

Additional Information

How to Cite

Michalski, G., J. G. Bockheim, C. Kendall, and M. Thiemens (2005), Isotopic composition of Antarctic Dry Valley nitrate: Implications for NOy sources and cycling in Antarctica, Geophys. Res. Lett., 32, L13817, doi:10.1029/2004GL022121.

Author Information

  1. 1

    Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana, USA

  2. 2

    Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California, USA

  3. 3

    Department of Soil Science, University of Wisconsin-Madison, Madison, Wisconsin, USA

  4. 4

    United States Geological Survey, Menlo Park, California, USA

Publication History

  1. Issue published online: 9 JUL 2005
  2. Article first published online: 9 JUL 2005
  3. Manuscript Accepted: 19 MAY 2005
  4. Manuscript Revised: 25 APR 2005
  5. Manuscript Received: 30 NOV 2004

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[1] Nitrates minerals from the Dry Valleys of Antarctica have been analyzed for their oxygen and nitrogen isotopic compositions. The 15N was depleted with δ15N values ranging from −9.5 to −26.2‰, whereas the 17O and 18O isotopes were highly enriched (with excess 17O) with δ18O values spanning 62–76‰ and Δ17O values from 28.9 to 32.7‰. These are the largest 17O enrichments observed in any known mineral. The oxygen isotopes indicate that nitrate is from a combination of tropospheric transport of photochemically produced HNO3 and HNO3 formed in the stratosphere.

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