Climate-related signals in the GV7-C ice core from East Antarctica for 1782–2013 CE: Potential relevance to climate and teleconnections between tropics and Antarctica

Abstract. This study investigates climate-related signals preserved in the GV7-C ice core from East Antarctica (1782–2013 CE), analyzing stable water isotopes (δ¹⁸O and d-excess) and snow accumulation (SA). Annual data were compared with climate indices representing the El Niño–Southern Oscillation (Niño3.4, SOI), Southern Annular Mode (SAM), Indian Ocean Dipole (IOD), and sea surface temperature (SST) anomalies in the southeastern Indian Ocean (SST-SEIO). During 1957–2013 CE, δ¹⁸O correlated intermittently with Pacific Ocean sector indices, while d-excess consistently correlated with SAM, IOD, and SST-SEIO, indicating stable moisture sources from the Indian Ocean. Over the longer period (1872–2013 CE), δ¹⁸O correlations weakened, suggesting shifting climatic influences, whereas d-excess retained correlations, emphasizing its reliability for tracking moisture-source variability. Snow accumulation showed weak and inconsistent correlations with climatic variables, suggesting multiple influencing factors. Spatial correlation analyses revealed that δ¹⁸O and d-excess signals primarily reflect conditions in the Pacific and Indian Ocean sectors, respectively. These findings highlight dynamic teleconnections between Antarctic climate and tropical ocean conditions, underscoring the complexity of interpreting Antarctic ice core records in climate variability studies and emphasizing the importance of considering varying temporal resolutions and climatic contexts.