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Now showing items 119-138 of 217

Microbial CaCO3 mineral formation and stability in an experimentally simulated high pressure saline aquifer with supercritical CO2.

Mitchell, Andrew Charles; Phillips, Adrienne J.; Schultz, Logan; Parks, Stacy; Spangler, Lee; Cunningham, Alfred B.; Gerlach, Robin (2013-07)

The use of microbiologically induced mineralization to plug pore spaces is a novel biotechnology to mitigate the potential leakage of geologically sequestered carbon dioxide from preferential leakage pathways. The bacterial ...
Microbial cell budgets of an Arctic glacier surface quantified using flow cytometry.

Irvine-Fynn, T. D. L.; Edwards, A.; Newton, S.; Langford, H.; Rassner, S. M.; Telling, J.; Anesio, A. M.; Hodson, A. J. (2012-11-01)

Uncertainty surrounds estimates of microbial cell and organic detritus fluxes from glacier surfaces. Here, we present the first enumeration of biological particles draining from a supraglacial catchment, on Midtre Lovénbreen ...
Microbially enhanced carbonate mineralization and containment of CO2

Mitchell, Andrew C.; Phillips, Adrienne J.; Kaszuba, John P.; Hollis, W. Kirk; Cunningham, A. L. B.; Gerlach, Robin (2009-02-03)
Microbially enhanced carbon capture and storage by mineral-trapping and solubility-trapping

Mitchell, Andrew C.; Dideriksen, Knud; Spangler, Lee H.; Cunningham, Alfred; Gerlach, Robin (2010-03-01)

The potential of microorganisms for enhancing carbon capture and storage (CCS) via mineral-trapping (where dissolved CO2 is precipitated in carbonate minerals) and solubility trapping (as dissolved carbonate species in ...
Microbially enhanced geologic containment of sequestered supercritical CO2

Cunningham, A. B.; Gerlach, Robin; Spangler, L.; Mitchell, A. C. (2009-02)

Geologic sequestration of CO2 involves injection into underground formations including oil beds, deep un-minable coal seams, and deep saline aquifers with temperature and pressure conditions such that CO2 will likely be ...
Microbially Mediated Nitrogen Cycling in a Permanently Cold, High-Alpine, Subglacial Environment.

Lange, R.; Boyd, E.; Mitchell, A. C.; Hamilton, T.; Peters, J.; Skidmore, M. (2009-05-17)
The Middle Miocene to Pliocene record of Antarctica and the Southern Ocean

Hambrey, Michael John; Haywood, Alan (Elsevier, 2009)
Minor and trace elements as indicators of solute provenance and flow routing in a subglacial hydrological system

Mitchell, Andrew C.; Brown, Giles H.; Fuge, Ron (2006-03-15)

The utility of minor and trace elements for subglacial solute-provenance and hydrological flow-routing studies is investigated at Haut Glacier d’Arolla (HGA), Switzerland. Principal component analysis (PCA) applied to the ...
Modeling geochemical and biogeochemical reactions in subglacial environments.

Mitchell, Andrew C.; Brown, Giles H. (2008-01-01)

This study examines current subglacial biogeochemical weathering models using PHREEQCi, a computer-based speciation mass-balance (SMB) model, parameterized using hydrochemical and mineralogical field data from Haut Glacier ...
A modelling insight into the Icelandic Last Glacial Maximum ice sheet

Sugden, D.; Hubbard, Alun L.; Dugmore, A.; Norddahl, H. (2006-09)

A three-dimensional thermomechanical model is used to investigate the Last Glacial Maximum (LGM) Icelandic ice sheet and the climate responsible for it at . A series of sensitivity experiments reveal that Iceland is ...
A modelling reconstruction of the Last Glacial Maximum Ice Sheet and its deglaciation in the vicinity of the Northern Patagonian Icefield, South America

Hulton, N. R. J.; Hein, Andrew S.; Kaplan, Michael R.; Hubbard, Alun L. (2005)

ABSTRACT. A time-dependent model is used to investigate the interaction between climate, extent and fluctuations of Patagonian ice sheet between 45° and 48°S during the last glacial maximum (LGM) and its subsequent ...
Modelling the response of river systems to environmental change: progress, problems and prospects for palaeo-environmental reconstructions

Wiel, Marco J. Van De; Coulthard, Tom J.; Macklin, Mark G.; Lewin, John (2011-01)

Over the last decade several computational models, and several types of model, have been developed to simulate the response of river systems to environmental change over time scales of decades to millennia: hydrological ...
Modification of peripheral mountain ranges by former ice sheets: The Brecon Beacons, Southern UK

Jansson, Krister N.; Glasser, Neil F. (2008-05)

The Brecon Beacons in southern Wales is a large upland area (900 km2) close to the periphery of the former British–Irish Ice Sheet. The geomorphology of the Brecon Beacons highlands and surrounding areas was mapped using ...
A Monte Carlo error analysis for basal sliding velocity calculations

Chandler, David M.; Hubbard, Alun L.; Hubbard, Bryn; Nienow, P. W. (2006)

Since glacier beds are mostly inaccessible, numerical inversion of the surface velocity field provides a valuable method for calculating the basal shear stress and sliding velocity. However, previous theoretical studies ...
Morphological and ice-dynamical changes on the Tasman Glacier, New Zealand, 1990-2007

Quincey, Duncan J.; Glasser, Neil F. (2009-08-01)

This paper presents data concerning recent (1990–2007) surface morphological and ice-dynamical changes on the Tasman Glacier, New Zealand. We use remote-sensing data to derive rates of lake growth, glacier velocities and ...
Natural Low-pH Environments Unaffected by Human Activity Preface

Fuge, Ron; Eppinger, Robert G. (2011-06-21)
Need for Direct Measurements of Coupled Microbiological and Hydrological Processes at Different Scales in Porous Media Systems

Geesey, Gill G.; Mitchell, Andrew C. (2008-05-01)

Reactive transport models contain terms describing microbiological and hydrological processes that control fate and transport of contaminants in porous media. Most models assume that microbial reaction rate is independent ...
Neogene glacial record from the Sirius Group of the Shackleton Glacier region, central Transantarctic Mountains, Antarctica

Hambrey, Michael J. (2003-08)

Neogene glacigenic strata, collectively referred to as the Sirius Group, are widely distributed throughout the Transantarctic Mountains. The group is particularly well exposed near the head of Shackleton Glacier (858109 ...
Neogene glacigenic debris flows on James Ross Island, northern Antarctic Peninsula, and heir implications for regional climate history

Vautravers, Maryline; McArthur, John M.; Hambrey, Michael J.; Nelson, Anna E.; Smellie, John L.; Williams, Mark; Salzmann, Ulrich; Regelous, Marcel (2009-12)

Detailed sedimentological and microtextural analyses of newly-discovered late Neogene diamictites and other coarse-grained facies, mostly sandwiched between hyaloclastite of the James Ross Island Volcanic Group and Cretaceous ...
New insights into deformation and fluid flow processes in the Nankai Trough accretionary prism: Results of Ocean Drilling Program Leg 190

Henry, P.; Hisamitsu, T.; Dean, Andy; Hirano, S.; Klaus, A.; Cragg, B. A.; Fergusson, C. L.; Moore, G. F.; Taira, A.; Becker, L.; Boeckel, B. (2001-10)

The Nankai Trough accretionary prism is considered an “end-member” prism accreting a coarse terrigenous sediment section in a setting with structural simplicity, unparalleled resolution by seismic and other geophysical ...

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