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Journal Articles Nature Communications Year : 2022

Complex spatio-temporal structure of the Holocene Thermal Maximum

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Lukas Jonkers
  • Function : Author
  • PersonId : 1106746
Paola Moffa-Sanchez
Samuel L Jaccard
  • Function : Author
  • PersonId : 1197775
Anne de Vernal

Abstract

Abstract Inconsistencies between Holocene climate reconstructions and numerical model simulations question the robustness of climate models and proxy temperature records. Climate reconstructions suggest an early-middle Holocene Thermal Maximum (HTM) followed by gradual cooling, whereas climate models indicate continuous warming. This discrepancy either implies seasonal biases in proxy-based climate reconstructions, or that the climate model sensitivity to forcings and feedbacks needs to be reevaluated. Here, we analyze a global database of Holocene paleotemperature records to investigate the spatiotemporal structure of the HTM. Continental proxy records at mid and high latitudes of the Northern Hemisphere portray a “classic” HTM (8–4 ka). In contrast, marine proxy records from the same latitudes reveal an earlier HTM (11–7ka), while a clear temperature anomaly is missing in the tropics. The results indicate a heterogeneous response to climate forcing and highlight the lack of globally synchronous HTM.
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Dates and versions

insu-03882522 , version 1 (02-12-2022)

Licence

Attribution - CC BY 4.0

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Olivier Cartapanis, Lukas Jonkers, Paola Moffa-Sanchez, Samuel L Jaccard, Anne de Vernal. Complex spatio-temporal structure of the Holocene Thermal Maximum. Nature Communications, 2022, 13 (1), pp.5662. ⟨10.1038/s41467-022-33362-1⟩. ⟨insu-03882522⟩
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