Dana L. Royer
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View article: Estimating carbon assimilation rates from fossil leaves and application to the mid‐Miocene Clarkia forest
Estimating carbon assimilation rates from fossil leaves and application to the mid‐Miocene Clarkia forest Open
Premise The rate of carbon assimilation in leaves ( A ) is a key trait central to a plant's economic strategy that has downstream impacts on the regional and global cycling of carbon and other nutrients. Most previous paleoecological studi…
View article: Global patterns in community‐scale leaf mass per area distributions of extant woody non‐monocot angiosperms and their utility in the fossil record
Global patterns in community‐scale leaf mass per area distributions of extant woody non‐monocot angiosperms and their utility in the fossil record Open
Premise Leaf mass per area (LMA) links leaf economic strategies, community assembly, and climate and can be reconstructed from woody non‐monocot angiosperm (WNMA) fossils using the petiole metric (PM; petiole width 2 /leaf area). Reliable …
View article: Fossil leaf cuticle: Best practices for preparation and paleo-CO2 analysis
Fossil leaf cuticle: Best practices for preparation and paleo-CO2 analysis Open
International audience
View article: Carbon-cycle modelling and Phanerozoic climate change
Carbon-cycle modelling and Phanerozoic climate change Open
Greenhouse gases trap heat in the Earth’s atmosphere and warm our planet and on geological time-scales CO2 is the most influential greenhouse gas in modulating atmospheric temperature. During most of the Phanerozoic (past 540 million…
View article: The Sedimentary Record of Past Climate Change
The Sedimentary Record of Past Climate Change Open
Chapter 5 explores the question: how do we read the clues about past climates in the sedimentary record? This exploration begins by describing where and how sedimentary rocks can be accessed for paleoclimate studies, and emphasizing the ne…
View article: User-friendly carbon-cycle modelling and aspects of Phanerozoic climate change
User-friendly carbon-cycle modelling and aspects of Phanerozoic climate change Open
Carbon-cycle modelling is essential for testing the main carbon sources and sinks as climate forcings, and we introduce and describe GEOCARB_NET, a graphical user interface for the geologic carbon and sulfur cycle model GEOCARBSULFvolc. Th…
View article: Estimates of late Early Cretaceous atmospheric CO<sub>2</sub> from Mongolia based on stomatal and isotopic analysis of <i>Pseudotorellia</i>
Estimates of late Early Cretaceous atmospheric CO<sub>2</sub> from Mongolia based on stomatal and isotopic analysis of <i>Pseudotorellia</i> Open
Premise The Aptian–Albian (121.4–100.5 Ma) was a greenhouse period with global temperatures estimated as 10–15°C warmer than pre‐industrial conditions, so it is surprising that the most reliable CO 2 estimates from this time are <1400 ppm.…
View article: dilp: Reconstruct Paleoclimate and Paleoecology with Leaf Physiognomy
dilp: Reconstruct Paleoclimate and Paleoecology with Leaf Physiognomy Open
temperature (MAT), mean annual precipitation (MAP), and leaf dry mass per area (Ma), along with other useful quantitative leaf traits.Methods in this package described in Lowe et al. (in review).
View article: CO2PIP Consortium for Advancing paleo-CO2 reconstruction and Building the Next-Generation Phanerozoic CO2 Record
CO2PIP Consortium for Advancing paleo-CO2 reconstruction and Building the Next-Generation Phanerozoic CO2 Record Open
Paleo-CO2 reconstructions are integral to understanding the evolution of Earth system processes and their interactions given that atmospheric CO2 concentrations are intrinsically linked to planetary function. Furthermore, past periods of m…
View article: Carbon-cycle modelling and aspects of Phanerozoic climate change
Carbon-cycle modelling and aspects of Phanerozoic climate change Open
Greenhouse gases trap heat in the Earth’s atmosphere and warm our planet and on geological time-scales CO2 is the most influential greenhouse gas in modulating atmospheric temperature. During most of the Phanerozoic (past 540 million…
View article: Toward a Cenozoic history of atmospheric CO <sub>2</sub>
Toward a Cenozoic history of atmospheric CO <sub>2</sub> Open
The geological record encodes the relationship between climate and atmospheric carbon dioxide (CO 2 ) over long and short timescales, as well as potential drivers of evolutionary transitions. However, reconstructing CO 2 beyond direct meas…
View article: Early Miocene redwood fossils from Inner Mongolia: CO2 reconstructions and paleoclimate effects of a low Mongolian plateau
Early Miocene redwood fossils from Inner Mongolia: CO2 reconstructions and paleoclimate effects of a low Mongolian plateau Open
The early Miocene (~ 16–23 Ma) marks a critical transition in the Earth climate history from an Oligocene (~ 23–34 Ma) cooling trend towards the well-documented warm middle Miocene Climate Optimum at ~ 15 Ma. In eastern Asia, this transiti…
View article: No Consistent Shift in Leaf Dry Mass per Area Across the Cretaceous—Paleogene Boundary
No Consistent Shift in Leaf Dry Mass per Area Across the Cretaceous—Paleogene Boundary Open
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 ecological strategies remains understudied. Previous work in the Willisto…
View article: Moderate to Elevated Atmospheric CO<sub>2</sub> During the Early Paleocene Recorded by <i>Platanites</i> Leaves of the San Juan Basin, New Mexico
Moderate to Elevated Atmospheric CO<sub>2</sub> During the Early Paleocene Recorded by <i>Platanites</i> Leaves of the San Juan Basin, New Mexico Open
Throughout the Phanerozoic, estimated CO 2 levels from CO 2 proxies generally correlate well with independent estimates of temperature. However, some proxy estimates of atmospheric CO 2 during the Late Cretaceous and early Paleocene are lo…
View article: Plate tectonic degassing estimated from full-plate models and age distributions of arc-related zircons
Plate tectonic degassing estimated from full-plate models and age distributions of arc-related zircons Open
<p>Plate tectonics regulates atmospheric greenhouse gas concentrations and surface temperatures via sources (mainly volcanic CO<sub>2</sub> degassing) and sinks (silicate weathering and carbonate deposition). To constrain…
View article: Constraining conifer physiological parameters in leaf gas-exchange models for ancient CO2 reconstruction
Constraining conifer physiological parameters in leaf gas-exchange models for ancient CO2 reconstruction Open
Leaf gas-exchange models are increasingly used to reconstruct ancient atmospheric carbon dioxide (CO2) concentrations. One of these widely used models, the Franks model, requires stomatal size (guard cell width and either guard cell length…
View article: Leaf size estimation based on leaf length, width and shape
Leaf size estimation based on leaf length, width and shape Open
Background and Aims Leaf size has considerable ecological relevance, making it desirable to obtain leaf size estimations for as many species worldwide as possible. Current global databases, such as TRY, contain leaf size data for ~30 000 s…
View article: A tighter constraint on Earth-system sensitivity from long-term temperature and carbon-cycle observations
A tighter constraint on Earth-system sensitivity from long-term temperature and carbon-cycle observations Open
The long-term temperature response to a given change in CO 2 forcing, or Earth-system sensitivity (ESS), is a key parameter quantifying our understanding about the relationship between changes in Earth’s radiative forcing and the resulting…
View article: New paleogeographic and degassing parameters for long-term carbon cycle models
New paleogeographic and degassing parameters for long-term carbon cycle models Open
Atmospheric carbon has fluctuated considerably over geological time with solar, tectonic, and biological forcings driving changes in concentrations. However, reconstructions of past atmospheric CO2 concentrations have high uncertainties an…
View article: Revising key parameters for long-term carbon cycle models
Revising key parameters for long-term carbon cycle models Open
<p>CO<sub>2</sub> is the most important greenhouse gas in the Earth&#8217;s atmosphere and has fluctuated considerably over geological time. However, proxies for past CO<sub>2 </sub>concentrations have lar…
View article: Results files accompanying A tighter constraint on Earth-system sensitivity from long-term temperature and carbon-cycle observations
Results files accompanying A tighter constraint on Earth-system sensitivity from long-term temperature and carbon-cycle observations Open
These are the results files belonging to the `output` directory of the code repository that accompanies the study "A tighter constraint on Earth-system sensitivity from long-term temperature and carbon-cycle observations" by Wong et al. (2…
View article: Results files accompanying A tighter constraint on Earth-system sensitivity from long-term temperature and carbon-cycle observations
Results files accompanying A tighter constraint on Earth-system sensitivity from long-term temperature and carbon-cycle observations Open
These are the results files belonging to the `output` directory of the code repository that accompanies the study "A tighter constraint on Earth-system sensitivity from long-term temperature and carbon-cycle observations" by Wong et al. (2…
View article: Quantitative critique of leaf‐based paleo‐CO <sub>2</sub> proxies: Consequences for their reliability and applicability
Quantitative critique of leaf‐based paleo‐CO <sub>2</sub> proxies: Consequences for their reliability and applicability Open
A variety of proxies have been developed to reconstruct paleo‐CO 2 from fossil leaves. These proxies rely on some combination of stomatal morphology, leaf δ 13 C, and leaf gas exchange. A common conceptual framework for evaluating these pr…
View article: Connecting the Deep Earth and the Atmosphere
Connecting the Deep Earth and the Atmosphere Open
<p><span>The connections between the Earth&#8217;s interior and its surface are manifold, and defined by processes of material transfer: from the deep Earth to lithosphere, through the crust and into the interconnected syst…
View article: A tighter constraint on Earth-system sensitivity from long-term\n temperature and carbon-cycle observations
A tighter constraint on Earth-system sensitivity from long-term\n temperature and carbon-cycle observations Open
The long-term temperature response to a given change in CO2 forcing, or\nEarth-system sensitivity (ESS), is a key parameter quantifying our\nunderstanding about the relationship between changes in Earth's radiative\nforcing and the resulti…
View article: The DeepMIP contribution to PMIP4: methodologies for selection, compilation and analysis of latest Paleocene and early Eocene climate proxy data, incorporating version 0.1 of the DeepMIP database
The DeepMIP contribution to PMIP4: methodologies for selection, compilation and analysis of latest Paleocene and early Eocene climate proxy data, incorporating version 0.1 of the DeepMIP database Open
The early Eocene (56 to 48 million years ago) is inferred to have been the most recent time that Earth's atmospheric CO2 concentrations exceeded 1000 ppm. Global mean temperatures were also substantially warmer than those of the present da…