Marine anoxia linked to abrupt global warming during Earth's penultimate icehouse.
Proc Natl Acad Sci U S A
; 119(19): e2115231119, 2022 05 10.
Article
en En
| MEDLINE
| ID: mdl-35500118
ABSTRACT
Piecing together the history of carbon (C) perturbation events throughout Earth's history has provided key insights into how the Earth system responds to abrupt warming. Previous studies, however, focused on short-term warming events that were superimposed on longer-term greenhouse climate states. Here, we present an integrated proxy (C and uranium [U] isotopes and paleo CO2) and multicomponent modeling approach to investigate an abrupt C perturbation and global warming event (â¼304 Ma) that occurred during a paleo-glacial state. We report pronounced negative C and U isotopic excursions coincident with a doubling of atmospheric CO2 partial pressure and a biodiversity nadir. The isotopic excursions can be linked to an injection of â¼9,000 Gt of organic matterderived C over â¼300 kyr and to near 20% of areal extent of seafloor anoxia. Earth system modeling indicates that widespread anoxic conditions can be linked to enhanced thermocline stratification and increased nutrient fluxes during this global warming within an icehouse.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Agua de Mar
/
Calentamiento Global
Tipo de estudio:
Prognostic_studies
Límite:
Humans
Idioma:
En
Revista:
Proc Natl Acad Sci U S A
Año:
2022
Tipo del documento:
Article
País de afiliación:
China