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 Communjournal_title
Nature communicationsauthors
Porter TJ,Schoenemann SW,Davies LJ,Steig EJ,Bandara S,Froese DGdoi
10.1038/s41467-019-09622-ysubject
Has Abstractpub_date
2019-04-09 00:00:00pages
1631issue
1issn
2041-1723pii
10.1038/s41467-019-09622-yjournal_volume
10pub_type
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