Publications

The Stochastic Ice-Sheet and Sea-Level System Model v1.0 (StISSM v1.0)

Published in Geoscientific Model Development, 2022

Adding stochastic forcing options to ISSM to facilitate large-ensemble simulations

Recommended citation: Verjans, V., Robel, A., Seroussi, H., Ultee, L., and Thompson, A. (2022). "The Stochastic Ice-Sheet and Sea-Level System Model v1.0 (StISSM v1.0)." Geoscientific Model Development Article accepted. Preprint online: https://doi.org/10.5194/egusphere-2022-699 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-699/

Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales

Published in Nature Communications, 2022

What is forcing observed velocity changes at Helheim Glacier - atmosphere or ocean? It depends on the time scale.

Recommended citation: Ultee, L., Felikson, D., Minchew, B., Stearns, L.A., and Riel, B. (2022). "Helheim Glacier ice velocity variability responds to runoff and terminus position change at different timescales." Nature Communications. https://doi.org/10.1038/s41467-022-33292-y http://ehultee.github.io/files/Ultee_et_al-2022-Nature_Communications.pdf

SERMeQ model produces a realistic upper bound on calving retreat for 155 Greenland outlet glaciers

Published in Geophysical Research Letters, 2020

How does our theoretical speed limit on glacier retreat hold up in Greenland?

Recommended citation: Ultee, L. and Bassis, J. N. (2020). "SERMeQ model produces a realistic upper bound on calving retreat for 155 Greenland outlet glaciers." Geophysical Research Letters 47(21): e2020GL090213. doi:10.1029/2020GL090213 http://ehultee.github.io/files/2020GL090213.pdf

Tensile strength of glacial ice deduced from observations of the 2015 eastern Skaftá cauldron collapse, Vatnajökull ice cap, Iceland

Published in Journal of Glaciology, 2020

How much stress can glacier ice sustain before breaking?

Recommended citation: Ultee, L., Meyer, C. R. and Minchew, B. M. (2020). "Tensile strength of glacial ice deduced from observations of the 2015 eastern Skaftá cauldron collapse, Vatnajökull ice cap, Iceland." Journal of Glaciology FirstView. doi:10.1017/jog.2020.65 http://ehultee.github.io/files/jog-2020_65.pdf

A thin film viscoplastic theory for calving glaciers:toward a bound on the calving rate of glaciers

Published in Journal of Geophysical Research: Earth Surface, 2019

Is there a fastest possible glacier retreat by calving?

Recommended citation: Bassis, J. N. and Ultee, L. (2019). "A thin film viscoplastic theory for calving glaciers:toward a bound on the calving rate of glaciers." Journal of Geophysical Research: Earth Surface 124. doi:10.1029/2019JF005160 http://ehultee.github.io/files/BassisUltee-thin_film_viscoplastic-2019.pdf

From ice sheets to main streets: Intermediaries connect climate scientists to coastal adaptation

Published in Earth's Future, 2018

Commentary on avenues to productive public engagement for climate researchers. A collaboration with scholars of science usability.

Recommended citation: Ultee, L., Arnott, J. C., Bassis, J. N., and Lemos, M. C. (2018). "From ice sheets to main streets: Intermediaries connect climate scientists to coastal adaptation." Earth's Future 6(3): 299-304. doi:10.1002/2018EF000827 http://ehultee.github.io/files/2018EF000827.pdf

Collaborative creation and implementation of a Michigan Sustainability Case on urban farming in Detroit

Published in Case Studies in the Environment, 2018

Summary of a multimedia case study I co-authored for use in environmental studies courses. The corresponding case won an award for meaningful community impact, and is available for instructors at teachmsc.org.

Recommended citation: Boone, L., Ultee, L., Waisanen, E., Newell, J., Thorne, J.A. and Hardin, R. (2018). "Collaborative creation and implementation of a Michigan Sustainability Case on urban farming in Detroit." Case Studies in the Environment 2(1): 8-13. doi: 10.1525/cse.2017.000703 http://ehultee.github.io/files/cse-2017_000703_full.pdf

The future is Nye: An extension of the perfect plastic approximation to tidewater glaciers

Published in Journal of Glaciology, 2016

Foundational description of the idea behind the numerical model I developed for mass loss from calving glaciers.

Recommended citation: Ultee, L. and Bassis, J. N. (2016). "The future is Nye: an extension of the perfect plastic approximation to tidewater glaciers." Journal of Glaciology. 62(236): 1143-1152. doi: 10.1017/jog.2016.108 http://ehultee.github.io/files/jog-2016_108.pdf