Dr Andy Mitchell

Dr Andy Mitchell

Reader in Microbial Geochemistry

Contact Details


Andy Mitchell has come from Montana State University where he was an Assistant Research Professor in the Faculty of Chemical and Biological Engineering. Andy's interests are in the importance of microbes in regulating many common chemical reactions at the Earth's surface and in the deep subsurface, specifically through the interaction with mineral surfaces. He is particularly interested in how such processes allow microorganisms to survive in cold and icy environments and potentially on other planets. Andy also undertakes applied research into manipulating these biogeochemical processes for environmental engineering purposes, including metal and radionuclide pacification and geologic carbon capture and storage. Prior to this, Andy was a EU Marie Curie Fellow at the NanoGeoScience Centre, University of Copenhagen, a Postdoctoral Fellow in the Department of Microbiology, Montana State University, and a Postdoctoral Fellow in the Department of Geology, University of Toronto. Andy has travelled and worked all over the world, and is particularly drawn to mountainous areas and mountain sports.



Lab and field based Microbial Geochemistry:

  • Microbe-metal-sediment interaction, transport and deposition
    • Biogeochemistry in glacierised and snow covered environments
    • Environmental engineering - Bioremediation in surface and groundwater; Subsurface geologic carbon sequestration, enhanced oil recovery

Recent Grants and funding:

  • EU Innovative Training Networks (ITN). 2016-2020. ‘MicroArctic’. Microorganisms in Warming Arctic Environments. No. 675546. £3.8M. Work Package Leader and Co-Investigator.
  • Sêr Cymru National Research Network award for Low Carbon, Energy and the Environment 2014-2019. 'Geo-Carb-Cymru' The potential of low carbon subsurface energy in Wales. (£771,000). Principal Investigator.
  • HEFCW research capital investment 2013-14. Ex2EL Extreme Experimental Environments Laboratory. Principal investigators Dr Andrew Mitchell and Dr Arwyn Edwards (£350,000).
  • EU Maire Curie Reintegration Grant. CO2 TRAP. Proposal No: 277005. PI. (€45,000). Principal Investigator.

Postoctoral Fellowships (host):

  • Newton International Postdoctoral Fellowship 2018-2020 (host). New insight into the microbial transformation of selenium for bio-remediation - Dr. Pallavee Srivastara.
  • EU Marie Curie COFUND postdoctoral fellowship 2017-2020 (Host). KAT-TRAP: Kinetic And Thermodynamic controls on calcium carbonate formation during geologic carbon TRAPping project - Dr. Karina Sand.


IGHPP Director of Research Science

Co-Director - Interdisciplinary Centre for Environmental Microbiology

Manager - Extreme Experimental Environments Laboratory (Ex2El)

Associate Editor Frontiers in Geochemistry

UK Mineralogical Society Committee Member

Research Groups

  • Centre for Glaciology
  • Environment and Society


Michaud, AB, Dore, JE, Achberger, AM, Christner, BC, Mitchell, A, Skidmore, ML, Vick-Majors, T & Priscu, JC 2017, 'Microbial oxidation as a methane sink beneath the West Antarctic Ice Sheet' Nature Geoscience, vol 10, pp. 582-586. DOI: 10.1038/ngeo2992
Vick-Majors, TJ, Mitchell, A, Achberger, AM, Christner, BC, Dore, JE, Michaud, AB, Priscu, JC & The WISSARD Science Team 2016, 'Physiological Ecology of Microorgansisms in Subglacial Lake Whillans' Frontiers in Microbiology, vol 7, 1705. DOI: 10.3389/fmicb.2016.01705
Michaud, AB, Skidmore, ML, Mitchell, AC, Vick-Majors, TJ, Barbante, C, Turetta, C, Vangelder, W & Priscu, JC 2016, 'Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica' Geology, vol 44, no. 5, pp. 347-350. DOI: 10.1130/G37639.1
Vick-majors, TJ, Achberger, A, Santibáñez, P, Dore, JE, Hodson, T, Michaud, AB, Christner, BC, Mikucki, J, Skidmore, ML, Powell, R, Adkins, WP, Barbante, C, Mitchell, A, Scherer, R & Priscu, JC 2016, 'Biogeochemistry and microbial diversity in the marine cavity beneath the McMurdo Ice Shelf, Antarctica: Biogeochemistry under the MCM ice shelf' Limnology and Oceanography, vol 61, no. 2, pp. 572-586. DOI: 10.1002/lno.10234
Reiche, J, Lucas, R, Mitchell, AL, Verbesselt, J, Hoekman, DH, Haarpaintner, J, Kellndorfer, JM, Rosenqvist, A, Lehmann, EA, Woodcock, CE, Seifert, FM & Herold, M 2016, 'Combining satellite data for better tropical forest monitoring' Nature Climate Change, vol 6, no. 2, pp. 120-122. DOI: 10.1038/nclimate2919
Stevens, IT, Irvine-Fynn, T, Porter, PR, Smart, M, Moorman, BJ, Hodson, AJ, Edwards, A & Mitchell, A 2016, 'Near-surface permeability of Northern Hemisphere Glaciers' AGU Fall Meeting 2016, San Francisco, United States of America, 2016 - 2016, pp. C41D-0708.
Mikucki, JA, Lee, PA, Ghosh, D, Purcell, AM, Mitchell, A, Mankoff, KD, Fisher, AT, Tulaczyk, S, Carter, S, Siegfried, MR, Fricker, HA, Hodson, T, Coenen, J, Powell, R, Scherer, R, Vick-Majors, T, Achberger, AA, Christner, BC & Tranter, M 2015, 'Subglacial Lake Whillans microbial biogeochemistry: a synthesis of current knowledge' Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, vol 374, no. 2059, 20140290. DOI: 10.1098/rsta.2014.0290
Phillips, AJ, Eldring, JJ, Hiebert, R, Lauchnor, E, Mitchell, A, Cunningham, A, Spangler, L & Gerlach, R 2015, 'Design of a Meso-Scale High Pressure Vessel for the Laboratory Examination of Biogeochemical Subsurface Processes' Journal of Petroleum Science and Engineering, vol 126, pp. 55-62.
Irvine-Fynn, T, Edwards, A & Mitchell, A 2015, 'Is there life on glaciers?: Glacier ecosystems and their impacts' Geography Review, vol 28, no. 3, pp. 38-41.
Christner, BC, Priscu, JC, Achberger, AM, Barbante, C, Carter, SP, Christianson, K, Michaud, AB, Mikucki, JA, Mitchell, A, Skidmore, ML, Vick-Majors, TJ & Science Team, TWISSARD 2014, 'A microbial ecosystem beneath the West Antarctic ice sheet' Nature, vol 512, no. 7514, pp. 310-313. DOI: 10.1038/nature13667
Edwards, A, Irvine-Fynn, TD, Mitchell, AC & Edwards Rassner, SM 2014, 'A germ theory for glacial systems?' WIREs Water, vol 1, no. 4, pp. 331-340. DOI: 10.1002/wat2.1029
Mitchell, AC, Phillips, AJ, Schultz, L, Parks, S, Spangler, L, Cunningham, AB & Gerlach, R 2013, 'Microbial CaCO3 mineral formation and stability in an experimentally simulated high pressure saline aquifer with supercritical CO2.' International Journal of Greenhouse Gas Control, vol 15, pp. 86-96. DOI: 10.1016/j.ijggc.2013.02.001
Cunninghamam, AB, Lauchnor, E, Eldring, J, Esposito, J, Mitchell, AC, Gerlach, R, Phillips, AJ, Ebigbo, A & Spangler, L 2013, 'Abandoned Well CO2 Leakage Mitigation Using Biologically Induced Mineralization: Current Progress and Future Directions.' Greenhouse Gases: Science and Technology, vol 3, no. 1, pp. 40-49. DOI: 10.1002/ghg.1331
Lauchnor, EG, Schultz, LN, Bugni, S, Mitchell, AC, Cunningham, AB & Gerlach, R 2013, 'Bacterially Induced Calcium Carbonate Precipitation and Strontium Coprecipitation in a Porous Media Flow System' Environmental Science & Technology, vol 47, no. 3, pp. 1557–1564. DOI: 10.1021/es304240y
Mitchell, AC, Lafreniere, MJ, Skidmore, ML & Boyd, ES 2013, 'Influence of bedrock mineral composition on microbial diversity in a subglacial environment' Geology, vol 41, no. 8, pp. 855-858. DOI: 10.1130/G34194.1
Phillipsa, AJ, Lauchnor, E, Eldring, J, Esposito, R, Mitchell, AC, Gerlach, R & Cunningham, AB 2012, 'Potential CO2 Leakage Reduction through Biofilm-Induced Calcium Carbonate Precipitation' Environmental Science & Technology, vol 47, no. 1, pp. 142-149. DOI: 10.1021/es301294q
Mitchell, AC, Peterson, L, Reardon, CL, Reed, SB, Culley, DE, Romine, MR & Geesey, GG 2012, 'Role of outer membrane c-type cytochromes MtrC and OmcA in Shewanella oneidensis MR-1 cell production, accumulation, and detachment during respiration on hematite' Geobiology, vol 10, no. 4, pp. 355-370. DOI: 10.1111/j.1472-4669.2012.00321.x
Hassenkam, T, Mitchell, AC, Pederson, C, Skovbjerg, L, Bovet, N & Stipp, S 2012, 'The low salinity effect observed on sandstone model surfaces' Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol 403, pp. 79-86. DOI: 10.1016/j.colsurfa.2012.03.058
Schultz, L, Pitts, B, Mitchell, AC, Cunningham, AB & Gerlach, R 2011, 'Imaging Biologically Induced Mineralization in Fully Hydrated Flow Systems' Microscopy Today, vol 19, no. 5, pp. 12-15. DOI: 10.1017/S1551929511000848
Boyd, ES, Lange, RK, Mitchell, AC, Havig, JR, Hamilton, TL, Lafrenière, MJ, Shock, EL, Peters, JW & Skidmore, M 2011, 'Diversity, Abundance, and Potential Activity of Nitrifying and Nitrate-Reducing Microbial Assemblages in a Subglacial Ecosystem' Applied and Environmental Microbiology, vol 77, no. 14, pp. 4778-4787. DOI: 10.1128/AEM.00376-11
Cunningham, AB, Gerlach, R, Spangler, L, Mitchell, AC, Parks, S & Phillips, A 2011, 'Reducing the risk of well bore leakage of CO2 using engineered biomineralization barrier' Energy Procedia, vol 4, pp. 5178-5185. DOI: 10.1016/j.egypro.2011.02.495
Fricker, HA, Powell, R, Priscu, J, Tulaczyk, S, Anandakrishnan, S, Christner, B, Holland, D, Horgan, H, Jacobel, R, Mikucki, J, Mitchell, A, Scherer, R & Severinghaus, J 2011, Siple Coast Subglacial Aquatic Environments: The Whillans Ice Stream Subglacial Access Research Drilling (WISSARD) project. in MJ Siegert, MC Kennicutt II & RA Bindschadler (eds), Antarctic Subglacial Aquatic Environments. vol. 192, Proceedings of the Chapman Conference on the Exploration and Study of Antarctic Subglacial Aquatic Environments. American Geophysical Union, Washington, D.C., Wiley, pp. 199-219.
Boyd, ES, Skidmore, M, Mitchell, AC, Bakermans, C & Peters, JW 2010, 'Methanogenesis in Subglacial Sediments' Environmental Microbiology Reports, vol 2, no. 5, pp. 685-692. DOI: 10.1111/j.1758-2229.2010.00162.x
Mitchell, AC, Dideriksen, K, Spangler, LH, Cunningham, A & Gerlach, R 2010, 'Microbially enhanced carbon capture and storage by mineral-trapping and solubility-trapping' Environmental Science & Technology, vol 44, no. 13, pp. 5270-5276. DOI: 10.1021/es903270w
Tulaczyk, SM, Anandakrishnan, S, Behar, AE, Christner, BC, Fisher, AT, Fricker, HA, Holland, DM, Jacobel, RW, Mikucki, J, Mitchell, AC, Powell, RD, Priscu, JC, Scherer, RP & Severinghaus, JP 2009, 'Whillans Ice Stream Subglacial Access Research Drilling (WISSARD): Integrative Study of Marine Ice Sheet Stability and Subglacial Life Habitats (Invited)' American Geophysical Union Fall Meeting 2010, San Fransisco, United States of America, 2010 - 2010, .
Mikucki, J, Mitchell, AC, Johnson, SS & Grzymski, J 2009, 'Exploring Subglacial Microbial Ecology (Invited)'.
Mitchell, AC, Christner, BC, Mikucki, J & Priscu, JC 2009, 'Subglacial (bio)geochemical weathering and the unexplored Antarctic system' American Geophysical Union Fall Meeting 2009, San Francisco, United States of America, 2009 - 2009, pp. abstract #U53C-09.
Boyd, E, Skidmore, ML, Mitchell, AC, Bakermans, C & Peters, J 2009, 'Subglacial Methanogenesis and Its Role in Planetary Carbon Cycling' American Geophysical Union Fall Meeting 2010, San Fransisco, United States of America, 2010 - 2010, .
Lange, R, Boyd, E, Mitchell, AC, Hamilton, T, Peters, J & Skidmore, M 2009, 'Microbially Mediated Nitrogen Cycling in a Permanently Cold, High-Alpine, Subglacial Environment.' American Geophysical Union Fall Meeting 2010, San Fransisco, United States of America, 2010 - 2010, .
Gerlach, R, Cunningham, AB, Ferris, FG & Mitchell, AC 2009, 'Metal and carbon dioxide sequestration through biologically induced mineral precipitation: Influence of hydrodynamics' 237th ACS National Meeting, Salt Lake City, Utah, Utah, United States of America, 2009 - 2009, .
Mitchell, AC, Phillips, AJ, Kaszuba, JP, Hollis, WK, Cunningham, ALB & Gerlach, R 2009, 'Microbially enhanced carbonate mineralization and containment of CO2' Geochimica et Cosmochimica Acta, vol 72, no. 12, pp. A636. DOI: 10.1016/j.gca.2008.05.016
Cunningham, AB, Gerlach, R, Spangler, L & Mitchell, AC 2009, 'Microbially enhanced geologic containment of sequestered supercritical CO2' Energy Procedia, vol 1, no. 1, pp. 3245-3252. DOI: 10.1016/j.egypro.2009.02.109
Mitchell, AC, Phillips, AJ, Hiebert, R, Gerlach, R, Spangler, LH & Cunninghamam, AB 2009, 'Biofilm enhanced geologic sequestration of supercritical CO2' International Journal of Greenhouse Gas Control, vol 3, no. 1, pp. 90-99. DOI: 10.1016/j.ijggc.2008.05.002
Mitchell, A & Geesey, GG 2009, 'Role of outer-membrane cytochromes on dissimilatory iron reduction under natural-flow conditions' Applied and Environmental Microbiology.
Cunningham, A, Spangler, L, Mitchell, A & Gerlach, R 2008, Microbally Enhanced Carbon Capture and Storage by Mineral-Trapping and Solubility-Trapping (PCT International Application No.: PCT/US2009/069389).
Mitchell, AC, Phillips, A, Kaszuba, J, Hollis, HK, Gerlach, R & Cunningham, A 2008, 'Biofilm enhanced subsurface sequestration of supercritical CO2' American Geophysical Union Fall Meeting 2010, San Fransisco, United States of America, 2010 - 2010, .
Mitchell, AC, Phillips, AJ, Hamilton, MA, Gerlach, R, Hollis, WK, Kaszuba, JP & Cunningham, AB 2008, 'Resilience of planktonic and biofilm cultures to supercritical CO2' Journal of Supercritical Fluids, vol 47, no. 2, pp. 318-325. DOI: 10.1016/j.supflu.2008.07.005
Geesey, GG & Mitchell, AC 2008, 'Need for Direct Measurements of Coupled Microbiological and Hydrological Processes at Different Scales in Porous Media Systems' Journal of Hydrologic Engineering, vol 13, no. 1, pp. 28-36. DOI: 10.1061/(ASCE)1084-0699(2008)13:1(28)
Lucas, RM, Mitchell, A & Bunting, PJ 2008, Hyperspectral data for assessing carbon dynamics and biodiversity of forests. in M Kalascka & GA Sanchez-Azofeifa (eds), Hyperspectral Remote Sensing of Tropical and Subtropical Forests. Taylor & Francis, pp. 47-86.
Mitchell, AC & Brown, GH 2008, 'Modeling geochemical and biogeochemical reactions in subglacial environments.' Arctic, Antarctic, and Alpine Research, vol 40, no. 3, pp. 531-547. DOI: 10.1657/1523-0430(06-075)[MITCHELL]2.0.CO;2
Mitchell, A & Ferris, FG 2007, 'The influence of Bacillus Pasteurii on the nucleation and growth of Calcium Carbonate' Geomicrobiology Journal, vol 23, no. 3-4, pp. 213-226. DOI: 10.1080/01490450600724233
Mitchell, A & Brown, GH 2007, 'Diurnal hydrological - physicochemical controls and sampling methods for minor and trace elements in an Alpine glacial hydrological system' Journal of Hydrology, vol 332, no. 1-2, pp. 123-143. DOI: 10.1016/j.jhydrol.2006.06.026
Mitchell, AC, Brown, GH & Fuge, R 2006, 'Minor and trace elements as indicators of solute provenance and flow routing in a subglacial hydrological system' Hydrological Processes, vol 20, no. 4, pp. 877-897. DOI: 10.1002/hyp.6112
Mitchell, A & Ferris, FG 2006, 'Effect of Strontium on the Size and Solubility of Calcite Crystals precipitated by Bacterial Ureolysis' Environmental Science & Technology, vol 40, no. 3, pp. 1008-1014.
Mitchell, A & Ferris, FG 2005, 'The Co-Precipitation of Sr into Calcite Precipitates Induced by Bacterial Ureolysis in Artificial Groundwater – Temperature and Kinetic Dependence' Geochimica et Cosmochimica Acta, vol 69, no. 17, pp. 4199-4210. DOI: 10.1016/j.gca.2005.03.014
Lucas, RM, Mitchell, A, Donnelly, B & Milne, T 2003, 'Characterising and Mapping Mangroves in Northern Australia Using Stereo Aerial Photography and Hyperspectral CASI Data' Paper presented at 2003 International Geoscience and Remote Sensing Symposium, Toulouse, France, 2003 - 2003, pp. 2380-2382.
Mitchell, A & Lucas, RM 2001, 'Integration of aerial photography, hyperspectral and SAR data for mangrove characterization' Paper presented at 2001 International Geoscience and Remote Sensing Symposium, Sydney, Australia, 2001 - 2001, pp. 2193-2195.
Lucas, RM, Milne, AK, Mitchell, A, Donnelly, B & Ellison, J 2000, 'Use of stereo aerial photography for assessing changes in the extent and height of mangrove canopies in tropical Australia' pp. 1880-1882. DOI: 10.1109/IGARSS.2000.858154