Recent summer warming in northwestern Canada exceeds the Holocene thermal maximum.

Abstract:

:Eastern Beringia is one of the few Western Arctic regions where full Holocene climate reconstructions are possible. However, most full Holocene reconstructions in Eastern Beringia are based either on pollen or midges, which show conflicting early Holocene summer temperature histories. This discrepancy precludes understanding the factors that drove past (and potentially future) climate change and calls for independent proxies to advance the debate. We present a ~13.6 ka summer temperature reconstruction in central Yukon, part of Eastern Beringia, using precipitation isotopes in syngenetic permafrost. The reconstruction shows that early Holocene summers were consistently warmer than the Holocene mean, as supported by midges, and a thermal maximum at ~7.6-6.6 ka BP. This maximum was followed by a ~6 ka cooling, and later abruptly reversed by industrial-era warming leading to a modern climate that is unprecedented in the Holocene context and exceeds the Holocene thermal maximum by +1.7 ± 0.7 °C.

journal_name

Nat Commun

journal_title

Nature communications

authors

Porter TJ,Schoenemann SW,Davies LJ,Steig EJ,Bandara S,Froese DG

doi

10.1038/s41467-019-09622-y

subject

Has Abstract

pub_date

2019-04-09 00:00:00

pages

1631

issue

1

issn

2041-1723

pii

10.1038/s41467-019-09622-y

journal_volume

10

pub_type

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