Trevor R. Hillebrand Postdoctoral Research Associate Fluid Dynamics and Solid Mechanics Group Los Alamos National Laboratory [email protected] https://trevorhillebrand.wixsite.com/home https://orcid.org/0000-0003-3535-1540

Research Interests I investigate the past, present, and future of Earth’s ice sheets using data-constrained numerical models of ice flow with the goal of improving estimates of future sea-level rise. As a postdoctoral researcher at Los Alamos National Laboratory, I investigate future sea-level rise from mass loss of the Greenland Ice Sheet using the finite-element MALI ice sheet model run on high-performance computing platforms. I collect geophysical and geological data through fieldwork and remote sensing campaigns in Antarctica and other glaciated regions, and I incorporate these measurements into numerical models in order to better understand ice-sheet sensitivity to climate.

Education June 2019 Ph.D. Earth and Space University of Washington Sciences Advisor: Dr. John Stone Dissertation: Quaternary grounding-line fluctuations in Antarctica

March 2018 M.Sc. Applied University of Washington Mathematics

June 2016 Ph.C. Earth and Space University of Washington Sciences Dec. 2012 B.A. Geology (High University of California Honors), Music Berkeley Advisors: Dr. Kurt Cuffey & Honors Thesis: A comparison of tectonics of the eastern Sierra Nevada, Dr. David Shuster CA in the vicinity of Mt. Whitney and Lee Vining, using (U-Th)/He and 4He/3He thermochronometry: Preliminary results and thermal modeling

Professional Positions Colorado College Oct. – Nov. 2020 One-block Visiting Assistant Professor Los Alamos National Laboratory Oct. 2019 – present Postdoctoral Research Associate University of Washington 2013 – 2019 Graduate Research/Teaching Asst. University of Washington June – Sept. 2013 Lab Assistant Berkeley Geochronology Center Sept. – Dec. 2012 Undergraduate Research Assistant United States Forest Service May – Aug. 2012 Physical Science Technician Berkeley Geochronology Center May – Aug. 2011 Undergraduate Research Assistant UCSB Institute for Crustal Studies May – Aug. 2010 Undergraduate Research Assistant

Research Grants and Fellowships Los Alamos National Laboratory Institutional Computing Program: Reducing uncertainties in 21st century sea-level rise through improved modeling of the ice sheet basal interface. 2020 (3 million core- hours on LANL supercomputers)

National Science Foundation Earth Sciences Postdoctoral Fellowship: Did multiple scales of erosion beneath the Laurentide Ice Sheet control Pleistocene glacial cycles? 2019 ($174,000; offer declined)

West Antarctic Ice Sheet Workshop travel grant to attend conference in San Diego, CA. 2019 ($825)

University of Washington Quaternary Research Center Award: Constraining past Antarctic Ice Sheet thickness using cosmogenic 14C in bedrock. 2017 ($6,750)

Scientific Committee on Antarctic Research travel grant to attend Past Antarctic Ice Sheet conference in Trieste, Italy. 2017 ($1,210)

University of Washington Earth and Space Sciences Inquisitive Graduate Student Support Fund Fellowship & Jody Bourgeois Graduate Student Support Fund Fellowship: Holocene deglaciation of the Ross Sea, Antarctica. 2015 ($2,500)

University of Washington Earth and Space Sciences Peter Misch Fellowship: Surface evolution of Khumbu Glacier: quantifying the effects of climate change at the Himalayan crest. 2014 ($800)

University of California Berkeley Charles Ramsden Undergraduate Research Fellowship: Tectonic evolution of the eastern Sierra Nevada, California. 2012 ($2,400)

Awards and Honors UC Berkeley High Honors in Geology, Dec. 2012 UC Berkeley Distinction in General Scholarship, Dec. 2012 UC Berkeley Dean’s Honors List, Dec. 2012

Peer Reviewed Publications and Accepted Manuscripts Hillebrand, TR, H Conway, C Martín, J Paden, MR Koutnik, JP Winberry (2021). Radio-echo sounding and waveform modeling reveals abundant marine ice in former rifts and basal crevasses within Crary Ice Rise, Antarctica. Journal of Glaciology. doi:10.1017/jog.2021.17

Spector, P, JO Stone, G Balco, TR Hillebrand, M Thompson, T Black (2020). Miocene to Pleistocene glacial history of West Antarctica inferred from nunatak geomorphology and cosmogenic-nuclide measurements on bedrock surfaces. American Journal of Science, 320, 637–676.

King, C, B Hall, TR Hillebrand, JO Stone (2020). Delayed maximum and recession of an East Antarctic outlet glacier. Geology, 48(6), 630-634.

Spector, P, JO Stone, D Pollard, TR Hillebrand, C Lewis, J Gombiner (2018). West Antarctic Sites for Subglacial Drilling to Test for Past Ice-Sheet Collapse. The Cryosphere 12(8): 2741–57.

Balco, G, C Todd, K Huybers, S Campbell, M Vermeulen, M Hegland, BM Goehring, TR Hillebrand (2016). Cosmogenic-nuclide exposure ages from the Pensacola Mountains adjacent to the Foundation Ice Stream, Antarctica. American Journal of Science, 316(6), 542-577.

Manuscripts In Review Hillebrand, TR, JO Stone, M Koutnik, C King, H Conway, B Hall, K Nichols, B Goehring, MK Gillespie MK (2020). Holocene thinning and grounding-line retreat of Darwin and Hatherton Glaciers, Antarctica. The Cryosphere Discussions, 1–42 (doi:https://doi.org/10.5194/tc-2020-356)

Manuscripts in Preparation * Denotes undergraduate student Hillebrand, TR, MJ Hoffman, M Perego, S Price, I Howat. Manuscript in preparation. Projections of 21st century sea-level rise from Humboldt Glacier, north Greenland

*Roat, A, TR Hillebrand, MJ Hoffman. Manuscript in preparation. Investigating the impacts of channelized subglacial hydrology on melt rates at the margin of Humboldt Glacier in northern Greenland

Book, C, MJ Hoffman, S Kachuk, S Price, J Bassis, TR Hillebrand, M Perego. Manuscript in preparation. Sensitivity of coupled solid Earth-ice sheet modeling of Thwaites Glacier to coupling timescale and Earth rheology.

Stone, JO, P Spector, J Severinghaus, TR Hillebrand, J Gombiner, D Pollard, G Balco, N Brown, J Feathers, J Talghader, K Fifield. Manuscript in preparation. Subglacial evidence for stability of the West Antarctic Ice Sheet during past warm climates

Holschuh, N, TR Hillebrand, H Conway, K Christianson. Manuscript in preparation. Radiometric interpretation of sub-wavelength scatterers: Lessons from crevasse tips in radar data collected over Crary Ice Rise

Martín, C, TR Hillebrand, H Conway, JP Winberry, MR Koutnik, HFJ Corr, KW Nicholls, CL Stewart, J Kingslake, A Brisbourne. Manuscript in prep. Radar polarimetry at Crary Ice Rise, Antarctica, reveals details of ice-flow reorganization over the last millennium

Invited Talks Colorado College, Mathematics & Computer Science Department, Feb. 2021 CESM Paleoclimate and Land Ice Working Group Meeting, NCAR Mesa Lab, Feb. 2020 Colorado College, Geology Department, Oct. 2019.

Students Mentored Abby Roat, Colorado College (Summer 2020 to present). Project Title: Investigating the impacts of channelized subglacial hydrology on melt rates at the margin of Humboldt Glacier in northern Greenland. Abby’s 10-week summer project culminated in an abstract submitted to the 2020 American Geophysical Union Fall Meeting. She is continuing this project towards a senior thesis, co-advised by myself and Dr. Christine Siddoway.

Teaching Experience As visiting faculty at Colorado College Fall 2020 Evolution and stability of the West Antarctic Ice Sheet In this intensive 3.5-week long course — co-taught with Dr. Christine Siddoway — I taught the fundamentals of glaciology and ice-sheet modeling. I guided advanced undergraduates through design, implementation, and analysis of numerical model experiments using a state-of-the-art ice sheet model for comparison with their stratigraphic and isotopic analyses of new sediment cores from the margin of West Antarctica.

As a Teaching Assistant at the University of Washington Spring 2019 Introduction to Earth Sciences Winter 2018 Earth Materials Spring 2016 Economic Geology Fall 2014 Introduction to Earth Sciences; The Great Ice Age Winter 2014 Earth Materials

Presentations & Abstracts * Denotes undergraduate student Hillebrand, TR, MJ Hoffman, S Price, M Perego, A Roat*, I Howat (2021). Projections of 21st century sea-level contribution from the retreat of Humboldt Glacier, North Greenland. Oral presentation at Community Earth System Model Land Ice Working Group meeting. Hillebrand, TR, MJ Hoffman, S Price, M Perego, I Howat (2020). Projections of 21st century sea-level rise from Humboldt Glacier, north Greenland. In American Geophysical Union Fall Meeting 2020 Abstracts. Oral presentation at AGU Fall Meeting (online) Koutnik, MR, TR Hillebrand, H Conway, B Smith, J Stone, PE Spector (2020). Assimilating glaciological and geochronological data into ice-flow models to constrain the deglaciation of Beardmore Glacier, Transantarctic Mountains. In AGU Fall Meeting 2020 Abstracts. Oral presentation at AGU Fall Meeting (online) Breyer, C, G Barcheck, R Gomez-Fell, TR Hillebrand, BH Hills, LM Kaluzienski, J Martin, D Polashenski, D Shapero (2020). Ice sheet surface velocity determination from ICESat-2 repeat tracks. In AGU Fall Meeting 2020 Abstracts. Poster presentation at AGU Fall Meeting (online) *Roat, A, TR Hillebrand, MJ Hoffman (2020). Investigating the impacts of channelized subglacial hydrology on melt rates at the margin of Humboldt Glacier in northern Greenland. In AGU Fall Meeting 2020 Abstracts. Poster presentation at AGU Fall Meeting (online) Hillebrand, TR, MR Koutnik (2020). Variable response of Transantarctic outlet glaciers to grounding-line retreat during the last deglaciation. Oral presentation at West Antarctic Ice Sheet Workshop (online) Hillebrand, TR, H Conway, MR Koutnik, C Martín, J Paden, and JP Winberry (2019). Radio-echo sounding of Crary Ice Rise reveals abundant marine ice in former ice shelf rifts and basal crevasses. In AGU Fall Meeting 2019 Abstracts. Oral presentation at AGU Fall Meeting in San Francisco, CA Stone, J, P Spector, TR Hillebrand, JH Gombiner, JK Feathers, JP Severinghaus, D Pollard, G Balco, LK Fifield. (2019). West Antarctic Ice Sheet History from a Subglacial Bedrock Core. In AGU Fall Meeting 2019 Abstracts. Poster presentation at AGU Fall Meeting in San Francisco, CA Stone, J, P Spector, TR Hillebrand, JH Gombiner, JK Feathers, JP Severinghaus, D Pollard, G Balco, LK Fifield (2019). Searching for subglacial evidence of past West Antarctic Ice Sheet collapse — 1: Exposure history of a subglacial bedrock core. Oral presentation at West Antarctic Ice Sheet Workshop in Julian, CA Hillebrand, TR, P Spector, D Pollard, J Stone, JH Gombiner (2019). Searching for subglacial evidence of past West Antarctic Ice Sheet collapse — 2: Ice sheet modeling. Oral presentation at West Antarctic Ice Sheet Workshop in Julian, CA Hillebrand, TR, P Spector, D Pollard, and J Stone. (2019) West Antarctic Ice Sheet fluctuations during Pleistocene super-interglacials. Oral presentation at the UW ESS Research Gala Hillebrand, TR, King, C., Koutnik, MR, Stone, J, Hall, BL, Conway, H, Pollard, D, Goehring, BM, Nichols, KA, and Gillespie, M. (2018). Antarctic Ice Sheet retreat in the western Ross Embayment since the Last Glacial Maximum constrained by geochronology and ice flow modeling. In AGU Fall Meeting 2018 Abstracts. Poster presentation at AGU Fall Meeting in Washington, DC Spector, P, J Stone, TR Hillebrand, & J Gombiner (2017). Selecting Antarctic sites for subglacial bedrock recovery to test for past ice-sheet collapse, an example from the Pirrit Hills. Oral presentation at Geological Society of America (GSA) meeting in Seattle, WA Hillebrand, TR & 9 others (2017). Holocene grounding-line retreat and deglaciation of Darwin and Hatherton glaciers, Antarctica. Poster presentation at the West Antarctic Ice Sheet (WAIS) Workshop in Camp Casey, WA Conway, H, TR Hillebrand & 4 others (2017). The grounding and formation of Crary Ice Rise. Oral presentation at the West Antarctic Ice Sheet Workshop in Camp Casey, WA Gombiner, J & 6 others (TR Hillebrand is 7th author) (2017). Optical dating of past ice-free conditions in West Antarctica. Poster presentation at the West Antarctic Ice Sheet Workshop in Camp Casey, WA Stone, JO, P Spector, TR Hillebrand & 8 others (2017). West Antarctic Ice Sheet history from subglacial bedrock core. Invited oral presentation at the West Antarctic Ice Sheet Workshop in Camp Casey, WA Hillebrand, TR & 9 others (2017). Delayed deglaciation of Darwin and Hatherton glaciers, Antarctica. Poster presentation at Past Antarctic Ice Sheet Dynamics conference in Trieste, Italy Hillebrand, TR & 8 others (2017). Delayed deglaciation of Darwin Glacier, Antarctica. Oral presentation at UW Earth and Space Sciences Graduate Research Gala in Seattle, WA Martin, C, TR Hillebrand & 8 others (2017). Radar polarimetry at Crary Ice Rise, Antarctica, reveals details of ice-flow reorganization over the last millennium. Oral presentation at EGU General Assembly in Vienna. Hillebrand, TR & 6 others (2016). Structure of Crary Ice Rise, Antarctica revealed by ultra-high frequency radio echo sounding. Poster presentation at WAIS Workshop in Sterling, VA Hillebrand, TR & 8 others (2016). High frequency radio echo sounding of Crary Ice Rise, Antarctica. Oral presentation at UW Earth and Space Sciences Graduate Research Gala in Seattle, WA King, C, B Hall, JO Stone, TR Hillebrand (2016). Radiocarbon chronology of the local Last Glacial Maximum and subsequent recession alongside Hatherton Glacier, Antarctica. Poster presentation at WAIS Workshop in Sterling, VA Hillebrand, TR & 5 others (2015). Holocene deglaciation of the Darwin-Hatherton glacier system and the Ross Embayment, Antarctica. Oral presentation at WAIS Workshop in Loveland, CO Hillebrand, TR & 5 others (2015). Holocene deglaciation of the Ross Sea, Antarctica. Oral presentation at UW Earth and Space Sciences Graduate Research Gala in Seattle, WA King, C, B Hall, JO Stone, TR Hillebrand (2015). The timing of the Last Glacial Maximum in the Lake Wellman region, Hatherton Glacier, Antarctica. Oral presentation at WAIS Workshop in Loveland, CO Koutnik, M, H Conway, TR Hillebrand, JO Stone, & P Spector (2015). Assimilating geochronological data into ice-flow models to constrain the deglaciation of Transantarctic outlet glaciers. Poster presentation at WAIS Workshop in Loveland, CO Hillebrand, TR & 5 others (2014). Late Quaternary ice elevations of Hatherton Glacier, Antarctica. Oral presentation at GSA General Meeting in Vancouver, BC Hillebrand, TR, Barker, A.D., & Hallet, B. (2013). Surface evolution of Khumbu Glacier, Nepal. Oral presentation at Northwest Glaciologists Meeting at Simon Fraser University, BC

Professional Service 2020 Outstanding Student Presentation Award judge, AGU Fall Meeting Los Alamos National Lab outreach program volunteer Reviewer for Geophysical Research Letters Reviewer for Journal of Geophysical Research

2019 Outstanding Student Presentation Award judge, AGU Fall Meeting

2017 – 2018 UW Earth & Space Sciences Diversity Committee member

2016 - 2017 Graduate student representative to UW Earth & Space Sciences Preliminary Exams

2015 - 2016 Outreach Coordinator for UW Earth & Space Sciences Rockin’ Out K-12 outreach program. Acting coordinator March 2017. During my time as coordinator, we taught 853 students in small classroom visits, and presented at science nights with combined student and family attendance of over 2,200.

2014 – 2018 Volunteer Instructor/Presenter for Rockin’ Out at various elementary and middle school science nights, classroom visits, and fieldtrips; at UW glaciology exhibit at annual Polar Science Weekend.

Field Experience Nov. 2016 – Feb. 2017 Pirrit Hills, West Antarctica July – Aug. 2016 Teanaway River, Cascade Mountains, WA Nov. – Dec. 2015 Crary Ice Rise, Antarctica Nov. 2013 – Jan. 2014 & Darwin and Hatherton Glaciers, Transantarctic Mountains, Antarctica Dec. 2014 – Jan. 2015

April – May 2013 Khumbu Glacier, Everest Region, Nepal March 2013 Kennicott Glacier, AK May – Sept. 2012 Eastern Sierra Nevada, CA July – Aug. 2011 Pioneer Mountains, MT

Professional Training and Workshops Nov. 2020 Los Alamos Postdoc Program Best Practice Grant Writing Workshop June 2020 ICESat-2 Hackweek March 2020 Enthought Python for Scientists and Engineers 5-day course Jan. 2020 ParaView Analysis and Visualization Workshop

Technical Skills Numerical Finite-element, finite-volume, and finite-difference modeling of ice sheet and glacier analysis flow, spectral methods, finite-difference time-domain methods for radar waveform modeling Data analysis Inverse theory, parameter estimation, geospatial analysis, spectral analysis, principal component analysis, image processing, dynamic mode decomposition

Programming Fortran, Python, Linux/Unix, bash, tcsh, NCO tools, Matlab

Fieldwork Glacial geologic mapping and sampling, ground based ice-penetrating radar surveys, GPS strain grid surveys Laboratory ICP-OES elemental analysis; column chemistry; AMS Al & Be cathode prep/analysis

References Dr. Matthew Hoffman (505) 665-5484 [email protected] Postdoctoral mentor Dr. John Stone (206) 221-6332 [email protected] Doctoral advisor

Dr. Christine Siddoway (719) 389-6717 [email protected] Co-instructor