New Estimation of the NOx Snow-Source on the Antarctic Plateau
Barbero A.; Savarino J.; Grilli R.; Blouzon C.; Picard G.; Frey M.M.; Huang Y.; Caillon N.
Date Issued2021
Other AbstractTo fully decipher the role of nitrate photolysis on the atmospheric oxidative capacity in snow-covered regions, NOx flux must be determined with more precision than existing estimates. Here, we introduce a method based on dynamic flux chamber measurements for evaluating the NOx production by photolysis of snowpack nitrate in Antarctica. Flux chamber experiments were conducted for the first time in Antarctica, at the French-Italian station Concordia, Dome C (75°06'S, 123°20’E, 3233 m a.s.l) during the 2019–2020 summer campaign. Measurements were gathered with several snow samples of different ages ranging from newly formed drifted snow to 6-year-old firn. Contrary to existing literature expectations, the daily average photolysis rate coefficient, (Formula presented.), did not significantly vary between differently aged snow samples, suggesting that the photolabile nitrate in snow behaves as a single-family source with common photochemical properties, where a (Formula presented.) = (2.37 (Formula presented.) 0.35) × 10−8 s−1 (1 (Formula presented.)) has been calculated from December 10th 2019 to January 7th 2020. At Dome C summer daily average NOx flux, (Formula presented.), based on measured NOx production rates was estimated to be (4.3 (Formula presented.) 1.2) × 108 molecules cm−2 s−1, which is 1.5–7 times less than the net NOx flux observed previously above snow at Dome C using the gradient flux method. Using these results, we extrapolated an annual continental snow sourced NOx budget of 0.017 (Formula presented.) 0.003 Tg (Formula presented.) N y−1, (Formula presented.) 2 times the nitrogen budget, (N-budget), of the stratospheric denitrification previously estimated for Antarctica. These quantifications of nitrate photolysis using flux chamber experiments provide a road-map toward a new parameterization of the (Formula presented.) product that can improve future global and regional models of atmospheric chemistry. © 2021. The Authors.
enkeywordsAntarctic Plateau; flux chamber; nitrate photolysis; snowpack emissions
journalJournal of Geophysical Research: Atmospheres
Source Publication英国自然环境研究理事会
Document Type期刊论文
AffiliationGrenoble INP (Institute of Engineering), IGE, University of Grenoble Alpes, CNRS, IRD, Grenoble, France; British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom; Department of Civil and Environmental Engineering, Wayne State University, Detroit, MI, United States
Recommended Citation
GB/T 7714
Barbero A.,Savarino J.,Grilli R.,et al. New Estimation of the NOx Snow-Source on the Antarctic Plateau[J]. 英国自然环境研究理事会,2021,126(20).
APA Barbero A..,Savarino J..,Grilli R..,Blouzon C..,Picard G..,...&Caillon N..(2021).New Estimation of the NOx Snow-Source on the Antarctic Plateau.Journal of Geophysical Research: Atmospheres,126(20).
MLA Barbero A.,et al."New Estimation of the NOx Snow-Source on the Antarctic Plateau".Journal of Geophysical Research: Atmospheres 126.20(2021).
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