Articles | Volume 24, issue 8
https://doi.org/10.5194/acp-24-4895-2024
https://doi.org/10.5194/acp-24-4895-2024
Research article
 | 
25 Apr 2024
Research article |  | 25 Apr 2024

An inverse model to correct for the effects of post-depositional processing on ice-core nitrate and its isotopes: model framework and applications at Summit, Greenland, and Dome C, Antarctica

Zhuang Jiang, Becky Alexander, Joel Savarino, and Lei Geng

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Cited articles

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Akers, P. D., Savarino, J., Caillon, N., Magand, O., and Le Meur, E.: Photolytic modification of seasonal nitrate isotope cycles in East Antarctica, Atmos. Chem. Phys., 22, 15637–15657, https://doi.org/10.5194/acp-22-15637-2022, 2022a. 
Akers, P. D., Savarino, J., Caillon, N., Servettaz, A. P. M., Le Meur, E., Magand, O., Martins, J., Agosta, C., Crockford, P., Kobayashi, K., Hattori, S., Curran, M., van Ommen, T., Jong, L., and Roberts, J. L.: Sunlight-driven nitrate loss records Antarctic surface mass balance, Nat. Commun., 13, 4274, https://doi.org/10.1038/s41467-022-31855-7, 2022b. 
Alexander, B. and Mickley, L. J.: Paleo-perspectives on potential future changes in the oxidative capacity of the atmosphere due to climate change and anthropogenic emissions, Curr. Pollut. Rep., 1, 57–69, https://doi.org/10.1007/s40726-015-0006-0, 2015. 
Alexander, B., Savarino, J., Kreutz, K. J., and Thiemens, M. H.: Impact of preindustrial biomass-burning emissions on the oxidation pathways of tropospheric sulfur and nitrogen, J. Geophys. Res., 109, D08303, https://doi.org/10.1029/2003JD004218, 2004. 
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Short summary
Ice-core nitrate could track the past atmospheric NOx and oxidant level, but its interpretation is hampered by the post-depositional processing. In this work, an inverse model was developed and tested against two polar sites and was shown to well reproduce the observed nitrate signals in snow and atmosphere, suggesting that the model can properly correct for the effect of post-depositional processing. This model offers a very useful tool for future studies on ice-core nitrate records.
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