Seasonality of reactive nitrogen oxides (NOy) at Neumayer Station, Antarctica

Weller, R.; Jones, A.E.; Wille, A.; Jacobi, H.-W.; McIntyre, H.P.; Sturges, W.T.; Huke, M.; Wagenbach, D.. 2002 Seasonality of reactive nitrogen oxides (NOy) at Neumayer Station, Antarctica. Journal of Geophysical Research, 107 (D23), 4673. 11, pp. 10.1029/2002JD002495

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NO, NOy (total reactive nitrogen oxides), gaseous HNO3, and particulate nitrate (p-NO3−) were measured at Neumayer Station from February 1999 to January 2000. In addition, during February 1999, the NOy component species peroxyacetyl nitrate (PAN) and methyl, ethyl, i-propyl, and n-propyl nitrates were determined. We found a mean NOy mixing ratio of 46 ± 29 pptv, with significantly higher values between February and end of May (58 ± 35 pptv). Between February and November, the (HNO3 + p-NO3−)/NOy ratio was extremely low (around 0.22) and in contrast to NOy the seasonality of p-NO3− and HNO3 showed a distinct maximum in November and December, leading to a (HNO3 + p-NO3−)/NOy ratio of 0.66. Trajectory analyses and radioisotope measurements (7Be, 10Be, 210Pb, and 222Rn) indicated that the upper troposphere or stratosphere was the main source region of the observed NOy with a negligible contribution of ground-level sources at northward continents. Frequent maxima of NOy mixing ratios up to 100 pptv are generally associated with air mass transport from the free troposphere of continental Antarctica, while air masses with the lowest NOy mixing ratios were typically advected from the marine boundary layer.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2002JD002495
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Signals in Antarctica of Past Global Changes
ISSN: 0148-0227
Additional Keywords: reactive nitrogen oxides, nitric acid, NO, alkyl nitrates
Date made live: 28 Mar 2012 13:09

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