Abstract
Preliminary nitrogen isotope data for ammonia from animal urine, fuel combustion, fertilizer use and fertilizer factories have been measured or estimated. It turns out that direct nitrogen isotope measurements of atmospheric ammonia at Jülich are in the expected range calculated from the δ ranges of different sources. For deposition of atmospheric ammonium in Jülich-rain a depletion in15N with respect to atmospheric ammonia has been found which is explained by isotope fractionations during rainout and washout. In correspondence with this fractionation model are nitrogen isotope data of rain-ammonium from coastal areas, which are enriched in15N due to the fact that sea water acts as a sink for atmospheric ammonia.
For Jülich rain-nitrate a pronounced seasonal trend has been detected with lower15N data in spring and summer than in autumn and winter. This trend is interpreted by different nitrogen isotope data of anthropogenic and natural nitric oxides which have been measured or estimated from isotope fractionation effects during nitrification and denitrification reactions in soils. It should be possible to get better global estimations for anthropogenic and natural nitric oxides from nitrogen isotope measurements.
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Freyer, H.D. Preliminary15N studies on atmospheric nitrogenous trace gases. PAGEOPH 116, 393–404 (1978). https://doi.org/10.1007/BF01636894
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DOI: https://doi.org/10.1007/BF01636894