Seasonal variation of trifluoroacetic acid (TFA) in Antarctic ice cores analysed by direct injection non-suppressed ion chromatography-mass spectrometry (nsIC-MS).

This study presents the first record of trifluoroacetic acid (TFA) in Antarctic ice cores, offering valuable data on TFA and its precursors' long-range atmospheric transport and deposition in remote polar regions. TFA is an ultra-short chain perfluoroalkyl acid (PFAA) that has gained attention due to its environmental persistence, stability, and mobility. It is primarily formed as an end product of atmospheric degradation of halogenated refrigerants and blowing agents, particularly hydrofluorocarbons (HFCs) and unsaturated HFCs (u-HFCs).

Segmented linear integral correlation Kernel ensemble reconstruction: A new method for climate reconstructions with applications to Holocene era proxies from an East Antarctic ice core.

Understanding past climate is essential to our knowledge of how our current climate system operates, and how it might respond to future change. Techniques to reconstruct climate history are challenging, and both accuracy and certainty are hampered by the quality of the datasets used. Here we both develop a new reconstruction tool and apply it to four ice core proxy based multi-millennial Holocene climate reconstructions, chosen because of their potential influence on East Antarctic climate.

An East Antarctic, sub-annual resolution water isotope record from the Mount Brown South Ice core.

We report high resolution measurements of the stable water isotope ratios (δO, δD) from the Mount Brown South ice core (MBS, 69.11 S 86.31 E).

Integral correlation for uneven and differently sampled data, and its application to the Law Dome Antarctic climate record.

We present a new simple and efficient method for correlation of unevenly and differently sampled data. This new method overcomes problems with other methods for correlation with non-uniform sampling and is an easy modification to existing correlation based codes. To demonstrate the usefulness of this new method to real-world examples, we apply the method with good success to two glaciological examples to map the ages from a well-dated ice core to a nearby core, and by tracing isochronous layers within the ice sheet measured from ice-penetrating radar between the two ice core sites.