Nitrate δ15N values and ice density-based surface mass balance from the ABN1314-103 ice core, Aurora Basin North, Antarctica ...

• Main Authors: Akers, Pete D, Savarino, Joël, Caillon, Nicolas, Servettaz, Aymeric P M, Le Meur, Emmanuel, Magand, Olivier, Agosta, Cécile, Crockford, Peter, Kobayashi, Kanon, Hattori, Shohei, Curran, Mark, van Ommen, Tas D, Jong, Lenneke, Roberts, Jason L, Martins, Jean
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2022
• Subjects: Antarctica; density; Ice core; nitrate; nitrogen isotope ratio δ15N; surface mass balance; Antarc*; ice core
• Online Access: https://dx.doi.org/10.1594/pangaea.941491; https://doi.pangaea.de/10.1594/PANGAEA.941491

Nitrate concentration and isotopic (δ15NNO3) data, ice density, and surface mass balance estimates from the ABN1314-103 ice core. This 103 m long core was drilled beginning on 07 January 2014 as one of three ice cores at Aurora Basin North, Antarctica (-71.17, 111.37, 2679 m.a.s.l), in the 2013-2014 field season. The age-depth model for ABN1314-103 was matched through ion profiles from an annually-resolved model (ALC01112018) originally developed for one of the other ABN cores through seasonal ion and water isotope cycles and constrained by volcanic horizons. Each 1 m segment of the core was weighed and measured for ice density calculations, and then sampled for nitrate at 0.33 m resolution. Nitrate concentrations were taken on melted ice aliquots with ion chromatography, while isotopic analysis was achieved through bacterial denitrification and MAT 253 mass spectrometry after concentrating with anionic resin. Using the density data and the age-depth model's dates for the top and bottom of each 1 m core ...