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Spatial variation of hydroclimate in north-eastern North America during the last millennium

Mackay, Helen; Amesbury, Matthew J.; Langdon, Pete G.; Charman, Dan J.; Magnan, Gabriel; van Bellen, Simon; Garneau, Michelle; Bainbridge, Rupert; Hughes, Paul D.M.

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Authors

Matthew J. Amesbury

Pete G. Langdon

Dan J. Charman

Gabriel Magnan

Simon van Bellen

Michelle Garneau

Rupert Bainbridge

Paul D.M. Hughes



Abstract

Climatic expressions of the Medieval Climate Anomaly (MCA) and the Little Ice Age (LIA) vary regionally, with reconstructions often depicting complex spatial patterns of temperature and precipitation change. The characterisation of these spatial patterns helps advance understanding of hydroclimate variability and associated responses of human and natural systems to climate change. Many regions, including north-eastern North America, still lack well-resolved records of past hydrological change. Here, we reconstruct hydroclimatic change over the past millennium using testate amoeba-inferred peatland water table depth reconstructions obtained from fifteen peatlands across Maine, Nova Scotia, Newfoundland and Québec. Spatial comparisons of reconstructed water table depths reveal complex hydroclimatic patterns that varied over the last millennium. The records suggest a spatially divergent pattern across the region during the Medieval Climate Anomaly and the Little Ice Age. Southern peatlands were wetter during the Medieval Climate Anomaly, whilst northern and more continental sites were drier. There is no evidence at the multi-decadal sampling resolution of this study to indicate that Medieval mega-droughts recorded in the west and continental interior of North America extended to these peatlands in the north-east of the continent. Reconstructed Little Ice Age hydroclimate change was spatially variable rather than displaying a clear directional shift or latitudinal trends, which may relate to local temporary permafrost aggradation in northern sites, and reconstructed characteristics of some dry periods during the Little Ice Age are comparable with those reconstructed during the Medieval Climate Anomaly. The spatial hydroclimatic trends identified here suggest that over the last millennium, peatland moisture balance in north-eastern North America has been influenced by changes in the Polar Jet Stream, storm activities and sea surface temperatures in the North Atlantic as well as internal peatland dynamics.

Citation

Mackay, H., Amesbury, M. J., Langdon, P. G., Charman, D. J., Magnan, G., van Bellen, S., …Hughes, P. D. (2021). Spatial variation of hydroclimate in north-eastern North America during the last millennium. Quaternary Science Reviews, 256, Article 106813. https://doi.org/10.1016/j.quascirev.2021.106813

Journal Article Type Article
Acceptance Date Jan 16, 2021
Online Publication Date Feb 12, 2021
Publication Date Mar 15, 2021
Deposit Date Jan 26, 2021
Publicly Available Date Mar 30, 2021
Journal Quaternary Science Reviews
Print ISSN 0277-3791
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 256
Article Number 106813
DOI https://doi.org/10.1016/j.quascirev.2021.106813
Public URL https://durham-repository.worktribe.com/output/1253438

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