Influence of local photochemistry on isotopes of nitrate in Greenland snow

Details Influence of local photochemistry on isotopes of nitrate in Greenland snow Influence of local photochemistry on isotopes of nitrate in Greenland snow

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3521804j&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 21, CiteID L21804

Physics

7

Biogeosciences: Nitrogen Cycling, Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Biogeosciences: Isotopic Composition And Chemistry (1041, 4870), Cryosphere: Biogeochemistry (0412, 0414, 1615, 4805, 4912)

Scientific paper

To explore the seasonality in δ 15N and δ 18O of nitrate in Greenland snow, we describe a simple box model of local photochemistry. Isotope ratios of HNO3 are controlled by the nitrogen isotope fractionation between NO and NO2, the ratio of NO2 to NO, and seasonal variations in HNO3 production. The observed seasonal range in δ 15N requires either a large net fractionation (~70‰) associated with NOx cycling or a seasonal change in the δ 15N of NOx sources. The observed range in δ 18O of nitrate is smaller than that calculated from HNO3 production pathways, suggesting that seasonal transport may also be required to explain the seasonality in nitrate δ 18O.

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