Oregon State University

College of Earth, Ocean, and Atmospheric Sciences

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Maureen (Mo) Walczak

Maureen Walczak photo
Research Associate (Post Doc)
Discipline: Geology and Geophysics
Office: Burt 108
Phone: 541-737-3037
Email: mwalczak@coas.oregonstate.edu
Vita or Résumé (PDF)

Research Interests

Application of foraminiferal stable isotopes (18O, 13C), trace element/Ca ratios (Mg/Ca, Mn/Ca, Sr/Ca) and radiogenic isotopes (14C, 10Be, 210Pb, 137Cs, 7Be, 234Th) in marine sediments for palaeoenvironmental reconstructions and sediment depositional histories

Geochemical (XRF, Nd, Sr, Pb isotopes) and paleomagnetic (u-channel cryogenic magnetometer, point-source magnetic susceptibility) studies of marine sediments

Physical properties studies of sediments (grain-size, Geotek MST, X-radiography, CT scan)

Investigating deglacial changes in meltwater input, stratification, and biogeochemical cycling in high-latitude environments.  

Current Research

My predominant research focus is in Pacific paleoceanography. Specific projects in various states of progress include: 

A radiocarbon-based reconstruction of North Pacific Intermediate Water (NPIW) circulation related to abrupt climate events of the past 50,000 years (w/Alan Mix, Joe Stoner, Stewart Fallon, Keith Fifield)

Establishing an environmental baseline for the Pacific Northwest: 10,000 years of climate and Columbia River discharge (w/Alan Mix, Joe Stoner, Summer Praetorius, Cris Lopes, Brendan Reilly)

A marine perspective of Pacific Northwest deglacial climate and the Missoula megafloods (w/Alan Mix, Joe Stoner, Summer Praetorius, Cris Lopes, Brendan Reilly, Ingrid Hendy)

Co-director of Oregon State University Marine Sediments Sampling (MARSSAM) Facility (w/ Mitch Lyle, Chris Goldfinger)



PhD, Oregon State University, Oceanography, 2011

MS, University of Washington, Oceanography, 2006

BS, University of Washington, Earth and Space Sciences, 2004

BS, University of Washington, Oceanography, 2004


July 2011-Jan 2015     Super Science Fellow Postdoctoral Scholar, Australia National University. Novel Dating Methods for Marine Sediments of Relevance to Determining Past Climate Change (Supervisors: P. DeDeckker, K. Fifield, and A. Roberts)

June-July 2013            Shipboard Science Participant in IODP Exp. 341: Southern Alaska Margin Tectonics, Climate, and Sedimentation. Physical properties specialist.

2006-2011                  PhD Student, College of Oceanic and Atmospheric Sciences, Oregon State University. Paleoclimate, Paleoventilation, and Paleomagnetism as Recorded in a 17kyr Marine Sediment Record from the SE Alaska Margin (Supervisors A.C. Mix and J.S. Stoner)

2010                           Teaching Assistant, Oceanography, Oregon State University

2004-2006                   MSc Student, Oceanography, University of Washington. Human and environmental impacts on Washington continental-shelf sedimentation: A thirty-year perspective  (Supervisor: C. Nittrouer)

2005                            Teaching Assistant, Oceanography, University of Washington

2003-2004                   Laboratory Technician, Oceanography, University of Washington


Tynan, S., B.N. Opdyke, A. Dutton, M.H. Walczak, S. Fallon (2017), Late Holocene interannual temperature variability inferred from the δ18O of Ostrea angasi shells. Australian Journal of Earth Sciences: doi.org/10.1080/08120099.2017.1360939

Walczak, M.H., J.S. Stoner, A.C. Mix, D. Heslop, J. Channell, J. Jaeger, G. Rosen, J. Southon, C. Xuan, (2017), A 17,000 year Paleomagnetic Secular Variation record from the Gulf of Alaska, Earth and Planet. Sci. Lett.doi: 10.10.1016/j.epsl.2017.05.022

Carlson, A., Z. Kilmer, L.B. Ziegler, J.S. Stoner, G.C. Wiles, K. Starr, M.H. Walczak, W. Colgan, A.V. Reyes, D.J. Leydet, R.G. Hatfield, (2017), Recent retreat of Columbia Glacier, Alaska: Millennial context, Geology doi: 10.1130/G38479.1.

Montelli, A., S.P. Gulick, L.L. Worthington, A. Mix, M.H. Davies-Walczak, S. Zellers, J. Jaeger (2017), Late Quaternary glacial dynamics and sedimentation variability in Bering Trough, Gulf of Alaska. Geology 45(1) doi:10.1130/G38836.1

Tynan, S., B.N. Opdyke, M.H. Walczak, S. Eggins, A. Dutton (2016), Assessment of Mg/Ca in Saccostrea glomerata (the Sydney Rock oyster) shell as a potential temperature proxy, Palaeogeography, Palaeoclimatology, Palaeoecology.

Praetorius, S., A. Mix, M.H. Walczak, M. Wolhowe, F. Prahl (2015), North Pacific deglacial hypoxic events linked to abrupt ocean warming, Nature 527:362-366 doi:10.1038/nature15753

Gulick, S.P, J.M. Jaeger, A.C. Mix, H. Asahi, H. Bahlburg, C. Belanger, G.B.B. Berbel, L. Childress, E. Cowan, M.H. Davies-Walczak, L. Drab, F. Dottori, M. Forwick, A. Fukumura, S. Ge, S. Gupta, A. Kioka, S. Konno, L. LeVay, C. März, K. Matsuzaki, E. McClymont, C. Moy, J. Müller, A. Nakamura, T. Ojima, K. Ridgeway, O. Romero, A. Slagle, J. Stoner, G. St-Onge, I. Suto, L. Worthington, I. Bailey, E. Enkelmann, and R. Reece (2015), Nonlinear feedback between tectonic uplift and glacial erosion constrained by Gulf of Alaska sedimentary record. Proceedings of the National Academy of Sciences 112(49):15042-15047 doi:10.1073/pnas.1512549112

Walczak, M.H., Mix, A.C., Willse, T., Slagle, A., Stoner, J.S., Jaeger, J., Gulick, S., LeVay, L., Kioka, A., and the IODP Expedition 341 Scientific Party (2015), Correction of non-intrusive drill core physical properties data for variability in recovered sediment volume. Geophysical Journal International 202(2):1317-1323  doi:10.1093/gji/ggv204.

MacPhail, M., K. Fifield, B. Pillans, M. Davies, and G. Hope (2015), Lake George revisited: New evidence for the origin and evolution of a large closed lake, Southern Tablelands, NSW, Australia. Australian Journal of Earth Sciences 62(7):853-871 doi:10.1080/08120099.2015.1108365.

Davies-Walczak, M.H., A.C. Mix, J.S. Stoner, J. Southon (2014), The flooding of Beringia and the onset of North Pacific Intermediate Water formation, Earth and Planetary Science Letters 397:57-66. 

Jaeger, J.M., S.P.S. Gulick, L.J. LeVay, and Expedition 341 Scientists (2014), Proc. IODP, 341: College Station, TX (Integrated Ocean Drilling Program). 

Expedition 341 Scientists (2013), Southern Alaska margin: Interactions of tectonics, climate, and sedimentation. IODP Preliminary Report 341.   

Heslop, D., Roberts, A., L. Chiang, M.H. Davies, A. Abrazhevich, P. De Deckker (2013), Quantifying magnetite magnetofossil contributions to sedimentary magnetizations, Earth and Planetary Science Letters 382:58-65. 

Addison, J.A., B.P. Finney, W.E. Dean, M.H. Davies, A.C. Mix, and J.M. Jaeger (2012), Productivity maxima and sedimentary d15N during the Last Glacial Maximum termination in the Gulf of Alaska, Paleoceanography 27(1) doi:10.1029/2011PA002161. 

Davies, M.H., A.C. Mix, J.S. Stoner, J.A. Addison, J. Southon (2011), The deglacial transition on the SE Alaska Margin; meltwater input, sealevel rise, enhanced productivity, and sedimentary hypoxia, Paleoceanography 26(2) doi:10.1029/2010PA002051.

Tesi, T., M. Goni, L. Langone, P. Puig, M. Canals , C. Nittrouer , X. Durrieu de Madron, A. Calafat, A.  Palanques , S.E Heussner , M.H. Davies, T. Drexler , J. Fabrés (2010), Re-exposure and advection of 14C-depleted organic carbon from old deposits at the upper continental slope, Global Biogeochemical Cycles. doi: 10.1029/2009GB003745

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