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Andy   Aschwanden

Faculty in Geophysical Institute
Research Associate Professor

Office:     Elvey 410 D
Phone:   (907) 474-7199
Email:     aaschwanden@alaska.edu

Education:

  • Ph.D.; ETH Zurich, Switzerland; 2008
  • M.Sc.; ETH Zurich, Switzerland; 2004

Postdoc Opportunities Fall 2019

  • In collaboration with the University of Texas at Austin, we currently have a 1.5-2 yr Postdoc position available to study ice-ocean interaction.

See Opportunities for more information about these projects.

Current Projects

  • 21st century regional sea level projections due to land ice mass losses and geodynamic adjustments using 3-D Earth models NASA. PI: R. Hock. Co-I's J. Freymueller and A. Aschwanden
  • Using ICESat/OIB elevation and satellite-derived velocity changes to constrain time-varying basal motion. NASA NNX17AG65G. 2017-2020. With Co-I's M. Fahnestock and D. Brinkerhoff.
  • Improving Greenland-wide ice discharge projections for the 21st century and beyond. NASA NNX16AQ40G. 2016-2017.
  • Collaborative Research: Understanding the controls on spatial and temporal variability in ice discharge using a Greenland-wide ice sheet model. NSF PLR-1603799. 2016-2019. With Co-PI P. Heimbach, UT.
  • Collaborative Research: Feedbacks between Orographic Precipitation and Ice Dynamics. NSF PLR-1644277. 2017-2020. With Co-PIs E. Pettit (UAF) and G. Roe (UW).
  • Understanding measured variability in the Greenland ice sheet using the Parallel Ice Sheet Model (PISM). PI: Ed Bueler, Co-I's: Mark Fahnestock and Andy Aschwanden. NASA MAP NNX13AM16G. 2013-2017.

Research Interests

My main research interests are the study the flow of glaciers and ice sheets and their interaction with the atmosphere and the ocean. I'm currently focusing on the flow history of the Greenland ice sheet and what we can learn from it to better predict future changes.

  • interaction between ice dynamics, calving, and fjord dyanamics
  • interaction between ice dynamics and orographic precipitation
  • mechanics and thermodynamics of glaciers and ice sheets
  • high resolution ice sheet modeling using the Parallel Ice Sheet Model (PISM)
  • stability of ice caps, tipping points
  • ice sheet model validation

Publications

2019

A. Aschwanden, Fahnestock, M. A., Truffer, M., Brinkerhoff, D. J., Hock, R., Khroulev, C., Mottram, R., and S. Khan, A., “Contribution of the Greenland Ice Sheet to sea level over the next millennium”, Science Advances, vol. 5, p. eaav9396, 2019.

2018

A. Roth, Hock, R., Schuler, T. V., Bieniek, P. A., Pelto, M., and Aschwanden, A., “Modeling Winter Precipitation Over the Juneau Icefield, Alaska, Using a Linear Model of Orographic Precipitation”, Frontiers in Earth Science, vol. 6, pp. 1–19, 2018.
H. Goelzer, Nowicki, S., Edwards, T., Beckley, M., Abe-Ouchi, A., Aschwanden, A., Calov, R., Gagliardini, O., Gillet-Chaulet, F., Golledge, N. R., Gregory, J., Greve, R., Humbert, A., Huybrechts, P., Kennedy, J. H., Larour, E., Lipscomb, W. H., Le clec'h, S., Lee, V., Morlighem, M., Pattyn, F., Payne, A. J., Rodehacke, C., Rückamp, M., Saito, F., Schlegel, N., Seroussi, H., Shepherd, A., Sun, S., van de Wal, R., and Ziemen, F. A., “Design and results of the ice sheet model initialisation experiments initMIP-Greenland: an ISMIP6 intercomparison”, The Cryosphere, vol. 12, pp. 1433–1460, 2018.

2017

D. Brinkerhoff, Truffer, M., and Aschwanden, A., “Sediment transport drives tidewater glacier periodicity”, vol. 8, no. 1, p. 90, 2017.

2016

I. S. Muresan, Khan, S. A., Aschwanden, A., Khroulev, C., Van Dam, T., Bamber, J., van den Broeke, M. R., Wouters, B., Munneke, P. Kuipers, and Kjær, K. H., “Modelled glacier dynamics over the last quarter of a century at Jakobshavn Isbræ”, The Cryosphere, vol. 10, pp. 597–611, 2016.
D. J. Brinkerhoff, Aschwanden, A., and Truffer, M., “Bayesian Inference of Subglacial Topography Using Mass Conservation”, Frontiers in Earth Science, vol. 4, pp. 1–27, 2016.
A. Aschwanden, Fahnestock, M. A., and Truffer, M., “Complex Greenland outlet glacier flow captured”, Nature Communications, vol. 7, p. 10524, 2016.
F. A. Ziemen, Hock, R., Aschwanden, A., Khroulev, C., Kienholz, C., MELKONIAN, A. N. D. R. E. W., and ZHANG, J. I. N. G., “Modeling the evolution of the Juneau Icefield between 1971 and 2100 using the Parallel Ice Sheet Model (PISM)”, Journal of Glaciology, vol. 62, pp. 199–214, 2016.
J. A. MacGregor, Fahnestock, M. A., Catania, G. A., Aschwanden, A., Clow, G. D., Colgan, W. T., S. Gogineni, P., Morlighem, M., Nowicki, S. M. J., Paden, J. D., Price, S. F., and Seroussi, H., “A synthesis of the basal thermal state of the Greenland Ice Sheet”, Journal of Geophysical Research: Earth Surface, 2016.
S. A. Khan, Sasgen, I., Bevis, M., van Dam, T., Bamber, J. L., Wahr, J., Willis, M., Kjaer, K. H., Wouters, B., Helm, V., Csatho, B., Fleming, K., Bjork, A. A., Aschwanden, A., Knudsen, P., and Munneke, P. Kuipers, “Geodetic measurements reveal similarities between post-Last Glacial Maximum and present-day mass loss from the Greenland ice sheet”, Science Advances, vol. 2, pp. e1600931–e1600931, 2016.

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