Fred Richards
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Ice Sheets Without Dynamic Topography Open
Dynamic topography results in uplift and subsidence events on Earth's surface with amplitudes on the order of a kilometer. These vertical motions are known to have influenced ice sheet evolution, but how dynamic topography has controlled t…
Revised Oceanic Plate Cooling Models Open
Global age‐depth and heat flow observations provide constraints for cooling and subsidence of oceanic plates. Numerous studies have addressed this problem, which has a bearing upon the calibration of shear‐wave tomographic models and upon …
Closing the budget of 20th century true polar wander Open
SUMMARY We revisit the budget of 20th century true polar wander (~1°/Myr in the direction of 70°W) using a state-of-the-art adjoint-based reconstruction of mantle convective flow and predictions of ongoing glacial isostatic adjustment that…
Towards a Quantitative Assessment of the Impact of Transient Mantle Rheology on Future Antarctic Ice-Sheet Stability Open
Mass transfer between the cryosphere and oceans leads to sea-surface height and topography changes whose timescales, amplitudes, and spatial patterns are controlled by mantle viscoelasticity. This ‘glacial isostatic adjustment’ (GIA) can s…
Reconciling surface deflections from simulations of global mantle convection Open
The modern state of the mantle and its evolution on geological timescales are of widespread importance for the Earth sciences. For instance, it is generally agreed that mantle flow is manifest in topographic and drainage network evolution,…
Pliocene shorelines and the epeirogenic motion of continental margins: a target dataset for dynamic topography models Open
Global mean sea level during the mid-Pliocene epoch (∼3 Ma), when CO2 and temperatures were above present levels, was notably higher than today due to reduced global ice sheet coverage. Nevertheless, the extent to which ice sheets responde…
Supplementary material to "Reconciling Surface Deflections From Simulations of Global Mantle Convection" Open
Contents of this file1. Equations of motion and description of numerical approach to solving them. Table summarising model parameters.3. Summary of spherical harmonic expansion used to estimate surface deflections.
Reconciling Surface Deflections From Simulations of Global Mantle Convection Open
The modern state of the mantle and its evolution on geological timescales is of widespread importance for the Earth sciences. For instance, it is generally agreed that mantle flow is manifest in topographic and drainage network evolution, …
Testing Mantle Convection Simulations With Paleobiology and Other Stratigraphic Observations: Examples From Western North America Open
Mantle convection plays a fundamental role in driving evolution of oceanic and continental lithosphere. In turn it impacts a broad suite of processes operating at or close to Earth's surface including landscape evolution, glacio‐eustasy, m…
View article: Satellite observations reveal shorter periodic inner core oscillation
Satellite observations reveal shorter periodic inner core oscillation Open
Detecting the Earth's inner core motions relative to the mantle presents a considerable challenge due to their indirect accessibility. Seismological observations initially provided evidence for differential/super-rotation of the inner core…
Reconciling Surface Deflections From Simulations of Global Mantle Convection Open
The modern state of the mantle and its evolution on geological timescales is of widespread importance for the Earth sciences. For instance, it is generally agreed that mantle flow is manifest in topographic and drainage network evolution, …
Antarctic Geothermal Heat Flow, Crustal Conductivity and Heat Production Inferred From Seismological Data Open
Geothermal heat flow is a key parameter in governing ice dynamics, via its influence on basal melt and sliding, englacial rheology, and erosion. It is expected to exhibit significant lateral variability across Antarctica. Despite this, sur…
Antarctic Geothermal Heat Flow, Crustal Conductivity and Heat Production Inferred From Seismological Constraints on Crustal Composition and Lithospheric Thermal Structure Open
Geothermal heat flow (GHF) is a crucial parameter governing ice flow rates at the base of the Antarctic Ice Sheet. Tectonic history biases the crustal distribution of heat-producing elements, and the pattern of mantle convection influences…
Pliocene shorelines and the epeirogenic motion of continental margins: A target dataset for dynamic topography models Open
Global mean sea level during the mid-Pliocene Epoch (~3 Ma), when CO2 and temperatures were above present levels, was notably higher than today due to reduced global ice sheet coverage. Nevertheless, the extent to which ice sheets responde…
Testing Mantle Convection Simulations with Paleobiology and Other Stratigraphic Observations: Examples from Western North America Open
Mantle convection plays a fundamental role in driving evolution of oceanic and continental lithosphere. In turn it impacts a broad suite of processes operating at or close to Earth’s surface including landscape evolution, glacio-eustasy, m…
GIA imaging of 3-D mantle viscosity based on palaeo sea level observations – Part I: Sensitivity kernels for an Earth with laterally varying viscosity Open
SUMMARY A key initial step in geophysical imaging is to devise an effective means of mapping the sensitivity of an observation to the model parameters, that is to compute its Fréchet derivatives or sensitivity kernel. In the absence of any…
Geodynamically corrected Pliocene shoreline elevations in Australia consistent with midrange projections of Antarctic ice loss Open
The Mid-Pliocene represents the most recent interval in Earth history with climatic conditions similar to those expected in the coming decades. Mid-Pliocene sea level estimates therefore provide important constraints on projections of futu…
Reconciling Surface Deflections From Simulations of Global Mantle Convection Open
The modern state of the mantle and its evolution over geological timescales is of widespread importance for the Earth sciences. For instance, it is generally agreed that mantle flow is manifest in topographic and drainage network evolution…
Antarctic Geothermal Heat Flow, Crustal Conductivity and Heat Production Inferred From Seismological Data Open
Geothermal heat flow is a key parameter in governing ice dynamics, via its influence on basal melt and sliding, englacial rheology, and erosion. It is expected to exhibit significant lateral variability across Antarctica. Despite this, sur…
Geodynamically corrected Pliocene shoreline elevations in Australia consistent with mid-range projections of Antarctic ice loss Open
Dataset provided as supplement to Richards et al. (2023). Geodynamically corrected Pliocene shoreline elevations in Australia consistent with mid-range projections of Antarctic ice loss, Science Advances, in review. bayesian_modelling_outp…
Destruction and regrowth of lithospheric mantle beneath large igneous provinces Open
Large igneous provinces (LIPs) are formed by enormous (i.e., frequently >10 6 km 3 ) but short-lived magmatic events that have profound effects upon global geodynamic, tectonic, and environmental processes. Lithospheric structure is known …
Regulation of Rad52-dependent replication fork recovery through serine ADP-ribosylation of PolD3 Open
Although Poly(ADP-ribose)-polymerases (PARPs) are key regulators of genome stability, how site-specific ADP-ribosylation regulates DNA repair is unclear. Here, we describe a novel role for PARP1 and PARP2 in regulating Rad52-dependent repl…
The influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on the Last Interglacial sea-level record of Northeastern Australia. Open
Dataset provided as supplement to Rovere et al. (2023). The influence of reef isostasy, dynamic topography, and glacial isostatic adjustment on the Last Interglacial sea-level record of Northeastern Australia, Communications Earth & Enviro…
Probabilistic Assessment of Antarctic Thermomechanical Structure: Impacts on Ice Sheet Stability Open
Uncertainty in present‐day glacial isostatic adjustment (GIA) rates represents at least 44% of the total gravity‐based ice mass balance signal over Antarctica. Meanwhile, physical couplings between solid Earth, sea level and ice dynamics e…
Can Correcting for Mantle Dynamics Reconcile Divergent Plio-Pleistocene Sea-Level Estimates? Open
Estimates of global mean sea level (GMSL) during past warm periods provide a key constraint on ice-sheet sensitivity to future climate change and inform projections of long-term sea-level rise. Measurements from the most recent periods of …
Global Analysis of lithosphere-asthenosphere dynamics using a revised plate cooling model Open
A global understanding of the evolution of oceanic lithosphere yields key insights about lithosphere-asthenosphere interaction. An important starting point is that age-depth and heatflow measurements provide the fundamental constraints for…
Refining Estimates of Antarctic Geothermal Heat Flow Using Seismological Constraints on Crustal Composition and Lithospheric Thermal Structure Open
Geothermal Heat Flow (GHF) is a crucial boundary condition governing ice sheet stability, due to the positive relationship between thermal input into the ice sheet and basal sliding rates. Tectonic history biases the crustal distribution o…
A Revised Estimate of Early Pliocene Global Mean Sea Level Using Geodynamic Models of the Patagonian Slab Window Open
Paleoshorelines serve as measures of ancient sea level and ice volume but are affected by solid Earth deformation including processes such as glacial isostatic adjustment (GIA) and mantle dynamic topography (DT). The early Pliocene Epoch i…