153961 - Sunlight-driven nitrate loss records Antarctic surface.pdf (3.9 MB)
Sunlight-driven nitrate loss records Antarctic surface mass balance
journal contribution
posted on 2023-05-21, 14:28 authored by Akers, PD, Savarino, J, Caillon, N, Servettaz, APM, Le Meur, E, Magand, O, Martins, J, Agosta, C, Crockford, P, Kobayashi, K, Hattori, S, Mark Curran, Tasman van OmmenTasman van Ommen, Lenneke JongLenneke Jong, Jason RobertsJason RobertsStandard proxies for reconstructing surface mass balance (SMB) in Antarctic ice cores are often inaccurate or coarsely resolved when applied to more complicated environments away from dome summits. Here, we propose an alternative SMB proxy based on photolytic fractionation of nitrogen isotopes in nitrate observed at 114 sites throughout East Antarctica. Applying this proxy approach to nitrate in a shallow core drilled at a moderate SMB site (Aurora Basin North), we reconstruct 700 years of SMB changes that agree well with changes estimated from ice core density and upstream surface topography. For the under-sampled transition zones between dome summits and the coast, we show that this proxy can provide past and present SMB values that reflect the immediate local environment and are derived independently from existing techniques.
History
Publication title
Nature CommunicationsVolume
13Article number
4274Number
4274Pagination
1-10ISSN
2041-1723Department/School
Institute for Marine and Antarctic StudiesPublisher
Nature Publishing GroupPlace of publication
United KingdomRights statement
© The Author(s) 2022. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.Repository Status
- Open