Cryptotephra from the Icelandic Veiðivötn 1477CE eruption in a Greenland ice core: confirming the dating of volcanic events in the 1450sCE and assessing the eruption’s climatic impact

• Published in: Climate of the Past
• Main Authors: Abbott, Peter M., Plunkett, Gill, Corona, Christophe, Chellman, Nathan J., McConnell, Joseph R., Pilcher, John R., Stoffel, Markus, Sigl, Michael
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2021
• Subjects: /dk/atira/pure/sustainabledevelopmentgoals/climate_action; name=SDG 13 - Climate Action; Antarc*; Antarctica; Greenland; Greenland ice core; ice core
• Online Access: https://pure.qub.ac.uk/en/publications/9d968b4d-5b41-49ad-9d77-08df5c6cf8f5; https://doi.org/10.5194/cp-17-565-2021; https://pureadmin.qub.ac.uk/ws/files/232520115/cry.pdf

Volcanic eruptions are a key source of climatic variability, and reconstructing their past impact can improve our understanding of the operation of the climate system and increase the accuracy of future climate projections. Two annually resolved and independently dated palaeoarchives – tree rings and polar ice cores – can be used in tandem to assess the timing, strength and climatic impact of volcanic eruptions over the past ∼ 2500 years. The quantification of post-volcanic climate responses, however, has at times been hampered by differences between simulated and observed temperature responses that raised questions regarding the robustness of the chronologies of both archives. While many chronological mismatches have been resolved, the precise timing and climatic impact of two major sulfate-emitting volcanic eruptions during the 1450s CE, including the largest atmospheric sulfate-loading event in the last 700 years, have not been constrained. Here we explore this issue through a combination of tephrochronological evidence and high-resolution ice-core chemistry measurements from a Greenland ice core, the TUNU2013 record. We identify tephra from the historically dated 1477 CE eruption of the Icelandic Veiðivötn–Bárðarbunga volcanic system in direct association with a notable sulfate peak in TUNU2013 attributed to this event, confirming that this peak can be used as a reliable and precise time marker. Using seasonal cycles in several chemical elements and 1477 CE as a fixed chronological point shows that ages of 1453 CE and 1458 CE can be attributed, with high precision, to the start of two other notable sulfate peaks. This confirms the accuracy of a recent Greenland ice-core chronology over the middle to late 15th century and corroborates the findings of recent volcanic reconstructions from Greenland and Antarctica. Overall, this implies that large-scale Northern Hemisphere climatic cooling affecting tree-ring growth in 1453 CE was caused by a Northern Hemisphere volcanic eruption in 1452 or early 1453 CE, and ...