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Marine anoxia linked to abrupt global warming during Earth’s penultimate icehouse

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 (∼304 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. [...]".

 

Source: Proceedings of the National Academy of Sciences
Authors: Jitao Chen et al.
DOI: https://doi.org/10.1073/pnas.2115231119

Read the full article here.


Greenhouse Gas Emissions From Native and Non-native Oysters

Abstract.

"Non-native species introductions are associated with a range of ecosystem changes such as habitat destruction, competition with native species, and biodiversity losses. Less well known is the role non-native species play in altering biogeochemical processes, such as the emission of greenhouse gases (GHGs). In this study we used laboratory incubations to compare seasonal (spring, summer, fall) emissions of the GHGs nitrous oxide (N2O), methane (CH4), and carbon dioxide (CO2) from native (Crassostrea virginica) and non-native (Ostrea edulis) oysters collected from a northern temperate estuary (Duxbury Bay, Massachusetts, USA). [...]"

Source: Frontiers in Environmental Science
Authors: Gretchen J. McCarthy et al.
DOI: 10.3389/fenvs.2019.00194

Read the full article here.


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