Toward a Cenozoic history of atmospheric CO2

Cenozoic CO2 Proxy Integration Project (CenCO2PIP) … - Science, 2023 - science.org
The geological record encodes the relationship between climate and atmospheric carbon
dioxide (CO2) over long and short timescales, as well as potential drivers of evolutionary …

The seawater carbon inventory at the Paleocene–Eocene Thermal Maximum

LL Haynes, B Hönisch - Proceedings of the National …, 2020 - National Acad Sciences
The Paleocene–Eocene Thermal Maximum (PETM)(55.6 Mya) was a geologically rapid
carbon-release event that is considered the closest natural analog to anthropogenic CO2 …

Nitrogen isotopes reveal independent origins of N2-fixing symbiosis in extant cycad lineages

MA Kipp, EE Stüeken, CAE Strömberg… - Nature Ecology & …, 2024 - nature.com
Cycads are ancient seed plants (gymnosperms) that emerged by the early Permian.
Although they were common understory flora and food for dinosaurs in the Mesozoic, their …

[HTML][HTML] Constraining conifer physiological parameters in leaf gas-exchange models for ancient CO2 reconstruction

JQ Liang, Q Leng, DF Höfig, G Niu, L Wang… - Global and Planetary …, 2022 - Elsevier
Leaf gas-exchange models are increasingly used to reconstruct ancient atmospheric carbon
dioxide (CO 2) concentrations. One of these widely used models, the Franks model, requires …

Quantitative critique of leaf‐based paleo‐CO2 proxies: Consequences for their reliability and applicability

W Konrad, DL Royer, PJ Franks… - Geological …, 2021 - Wiley Online Library
A variety of proxies have been developed to reconstruct paleo‐CO2 from fossil leaves.
These proxies rely on some combination of stomatal morphology, leaf δ 13 C, and leaf gas …

An inter-comparison study of three stomatal-proxy methods for CO2 reconstruction applied to early Jurassic Ginkgoales plants

N Zhou, Y Wang, L Ya, AS Porter, WM Kürschner… - Palaeogeography …, 2020 - Elsevier
The inverse relationship between concentrations of CO 2 in the atmosphere (pCO 2) and the
stomatal index of vascular plant has been widely used to estimate ancient levels of …

No Evidence for a Large Atmospheric CO2 Spike Across the Cretaceous‐Paleogene Boundary

JN Milligan, DL Royer, PJ Franks… - Geophysical …, 2019 - Wiley Online Library
Currently, there is only one paleo‐CO2 record from plant macrofossils that has sufficient
stratigraphic resolution to potentially capture a transient spike related to rapid carbon …

No consistent shift in leaf dry mass per area across the Cretaceous—Paleogene boundary

MJ Butrim, DL Royer, IM Miller, M Dechesne… - Frontiers in Plant …, 2022 - frontiersin.org
The Chicxulub bolide impact has been linked to a mass extinction of plants at the
Cretaceous—Paleogene boundary (KPB;∼ 66 Ma), but how this extinction affected plant …