Isotopic composition of Antarctic Dry Valley nitrate: Implications for NO y  sources and cycling in Antarctica | Zendy

Michalski G. | Zendy; Bockheim J. G. | Zendy; Kendall C. | Zendy; Thiemens M. | Zendy

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Isotopic composition of Antarctic Dry Valley nitrate: Implications for NO y sources and cycling in Antarctica

Author(s) -

Michalski G.,

Bockheim J. G.,

Kendall C.,

Thiemens M.

Publication year - 2005

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/2004gl022121

Subject(s) - nitrate , isotopes of oxygen , cycling , environmental chemistry , isotopes of nitrogen , nitrogen , stratosphere , oxygen , oxygen 18 , isotope , chemistry , troposphere , stable isotope ratio , mineralogy , geology , atmospheric sciences , nuclear chemistry , archaeology , organic chemistry , physics , quantum mechanics , history

Nitrates minerals from the Dry Valleys of Antarctica have been analyzed for their oxygen and nitrogen isotopic compositions. The 15 N was depleted with δ 15 N values ranging from −9.5 to −26.2‰, whereas the 17 O and 18 O isotopes were highly enriched (with excess 17 O) with δ 18 O values spanning 62–76‰ and Δ 17 O values from 28.9 to 32.7‰. These are the largest 17 O enrichments observed in any known mineral. The oxygen isotopes indicate that nitrate is from a combination of tropospheric transport of photochemically produced HNO 3 and HNO 3 formed in the stratosphere.

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