Tibetan Peat Records Global Major Explosive Volcanic Eruptions in the Holocene - Université de Pau et des Pays de l'Adour
Article Dans Une Revue Journal of Geophysical Research: Atmospheres Année : 2024

Tibetan Peat Records Global Major Explosive Volcanic Eruptions in the Holocene

Haijun Peng
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Mengxiu Zeng
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Bing Hong
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Jie Wang
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Baoxiang Fan
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Kevin Bishop
Chuxian Li
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Runsheng Yin
Richard Bindler
Wei Zhu

Résumé

Major explosive volcanic eruptions were important triggers of abrupt climate changes during the Holocene and crucial sources of Hg to the atmosphere, yet there remains limited understanding regarding the long‐range transportation of this volcanic Hg and its imprint in natural archives. Here, we present a reconstruction of Holocene global volcanism based on the anomalies in Hg concentrations, accumulation fluxes, and Hg/C ratios in three high‐resolution peat profiles spanning Eurasia. Our reconstruction reveals that the two Tibetan peat profiles recorded 33 major explosive volcanic eruptions (with 11 eruptions being synchronously detected), which correspond with a French Pyrenees peat record and sulfate anomalies in polar ice cores. Additionally, the major explosive volcanic eruptions recorded in the TP peat profiles coincided with abrupt decreases in solar irradiance during the Holocene, suggesting these eruptions might have had a greater global climate impact. Our results suggest the atmospheric transport of volcanic Hg within the Northern Hemisphere and underscore the significant role played by major explosive volcanic eruptions in precipitating abrupt global climate and environmental changes during the Holocene. This study has implications for deciphering the configuration of volcanic eruption seasons, locations, and magnitudes during the Holocene and aligning the chronology of peat deposits with ice cores.

Dates et versions

hal-04801896 , version 1 (25-11-2024)

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Citer

Haijun Peng, Maxime Enrico, Mengxiu Zeng, Bing Hong, Jie Wang, et al.. Tibetan Peat Records Global Major Explosive Volcanic Eruptions in the Holocene. Journal of Geophysical Research: Atmospheres, 2024, 129 (22), ⟨10.1029/2024JD041727⟩. ⟨hal-04801896⟩
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