Permafrost in the Cretaceous supergreenhouse.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
26 12 2022
26 12 2022
Historique:
received:
25
07
2022
accepted:
19
12
2022
entrez:
26
12
2022
pubmed:
27
12
2022
medline:
29
12
2022
Statut:
epublish
Résumé
Earth's climate during the last 4.6 billion years has changed repeatedly between cold (icehouse) and warm (greenhouse) conditions. The hottest conditions (supergreenhouse) are widely assumed to have lacked an active cryosphere. Here we show that during the archetypal supergreenhouse Cretaceous Earth, an active cryosphere with permafrost existed in Chinese plateau deserts (astrochonological age ca. 132.49-132.17 Ma), and that a modern analogue for these plateau cryospheric conditions is the aeolian-permafrost system we report from the Qiongkuai Lebashi Lake area, Xinjiang Uygur Autonomous Region, China. Significantly, Cretaceous plateau permafrost was coeval with largely marine cryospheric indicators in the Arctic and Australia, indicating a strong coupling of the ocean-atmosphere system. The Cretaceous permafrost contained a rich microbiome at subtropical palaeolatitude and 3-4 km palaeoaltitude, analogous to recent permafrost in the western Himalayas. A mindset of persistent ice-free greenhouse conditions during the Cretaceous has stifled consideration of permafrost thaw as a contributor of C and nutrients to the palaeo-oceans and palaeo-atmosphere.
Identifiants
pubmed: 36572668
doi: 10.1038/s41467-022-35676-6
pii: 10.1038/s41467-022-35676-6
pmc: PMC9792593
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
7946Informations de copyright
© 2022. The Author(s).
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