The Role of Small to Moderate Volcanic Eruptions in the Early 19th Century Climate

Small-to-moderate volcanic eruptions can lead to significant surface cooling when they occur clustered, as observed in recent decades. In this study, based on new high-resolution ice-core data from Greenland, we produce a new volcanic forcing data set that includes several small-to-moderate eruption...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Fang S. -W., Sigl M., Toohey M., Jungclaus J., Zanchettin D., Timmreck C.
Other Authors: Fang, S. -W., Sigl, M., Toohey, M., Jungclaus, J., Zanchettin, D., Timmreck, C.
Format: Article in Journal/Newspaper
Language:unknown
Published: 2023
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Online Access:https://hdl.handle.net/10278/5044528
https://doi.org/10.1029/2023GL105307
Description
Summary:Small-to-moderate volcanic eruptions can lead to significant surface cooling when they occur clustered, as observed in recent decades. In this study, based on new high-resolution ice-core data from Greenland, we produce a new volcanic forcing data set that includes several small-to-moderate eruptions not included in prior reconstructions and investigate their climate impacts of the early 19th century through ensemble simulations with the Max Planck Institute Earth System Model. We find that clustered small-to-moderate eruptions produce significant additional global surface cooling (∼0.07 K) during the period 1812–1820, superposing with the cooling by large eruptions in 1809 (unidentified location) and 1815 (Tambora). This additional cooling helps explain the reconstructed long-lasting cooling after the large eruptions, but simulated regional impacts cannot be confirmed with reconstructions due to a low signal-to-noise ratio. This study highlights the importance of small-to-moderate eruptions for climate simulations as their impacts can be comparable with that of solar irradiance changes.