Search
Now showing items 1-10 of 70
The energy penalty of post-combustion CO2 capture & storage and its implications for retrofitting the U.S. installed base
(Royal Society of Chemistry (RSC), 2009)
A review of the literature has found a factor of 4 spread in the estimated values of the energy penalty for post-combustion capture and storage of CO2 from pulverized-coal (PC) fired power plants. We elucidate the cause ...
Earthquake Ruptures with Thermal Weakening and the Operation of Major Faults at Low Overall Stress Levels
(American Geophysical Union, 2009)
We model ruptures on faults that weaken in response to flash heating of microscopic asperity contacts (within a rate-and-state framework) and thermal pressurization of pore fluid. These are arguably the primary weakening ...
Thermal Pressurization and Onset of Melting in Fault Zones
(American Geophysical Union, 2006)
We examine how frictional heating drives the evolution of temperature, strength, and fracture energy during earthquake slip. For small slip distances, heat and pore fluid are unable to escape the shearing fault core, and ...
Does Shear Heating of Pore Fluid Contribute to Earthquake Nucleation?
(American Geophysical Union, 2006)
Earthquake nucleation requires reduction of frictional strength \(\tau = \mu (\sigma - p) \) with slip or slip rate, where \(\mu, \sigma_n\), and \(p\) are the friction coefficient, normal stress, and fluid pressure, ...
Resolving systematic errors in estimates of net ecosystem exchange of CO2 and ecosystem respiration in a tropical forest biome
(Elsevier, 2008)
The controls on uptake and release of CO<sub>2</sub> by tropical rainforests, and the responses to a changing climate, are major uncertainties in global climate change models. Eddy-covariance measurements potentially provide ...
Off-Fault Plasticity and Earthquake Rupture Dynamics: 2. Effects of Fluid Saturation
(American Geophysical Union, 2008)
We present an analysis of inelastic off-fault response in fluid-saturated material during earthquake shear rupture. The analysis is conducted for 2-D plane strain deformation using an explicit dynamic finite element ...
Earthquake Slip Between Dissimilar Poroelastic Materials
(American Geophysical Union, 2008)
A mismatch of elastic properties across a fault induces normal stress changes during spatially nonuniform in-plane slip. Recently, Rudnicki and Rice showed that similar effects follow from a mismatch of poroelastic properties ...
Possible Mechanisms for Glacial Earthquakes
(American Geophysical Union, 2008)
The large glacial earthquakes reported on by Ekström et al. (2003, 2006) and Tsai and Ekström (2007) have previously been evaluated in terms of their seismic characteristics. In this paper we attempt to take constraints ...
Error Correlation Between CO2 and CO as Constraint for CO2 Flux Inversions Using Satellite Data
(Copernicus Publications, 2009)
Inverse modeling of CO2 satellite observations to better quantify carbon surface fluxes requires a chemical transport model (CTM) to relate the fluxes to the observed column concentrations. CTM transport error is a major ...
Intercontinental Source Attribution of Ozone Pollution at Western U.S. Sites Using an Adjoint Method
(American Geophysical Union, 2009)
We use the GEOS-Chem chemical transport model and its adjoint to quantify source contributions to ozone pollution at two adjacent sites on the U.S. west coast in spring 2006: Mt. Bachelor Observatory (MBO) at 2.7 km altitude ...