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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.