Posts by Collection

Glacial water supply

How does changing water supply from glaciers affect drought risk?

Ice dynamics

Drivers of Greenland Ice Sheet flow

Ice fracture

Material conditions that permit fracture in glacier ice

Ice dynamic contribution to sea level

How fast can glaciers shed mass to icebergs?

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

A plastic network approach to model calving glacier advance and retreat

Published in Frontiers in Earth Science, 2017

Description and validation of my model's applicability to interacting glacier tributary networks.

Recommended citation: Ultee, L. and Bassis, J.N. (2017). "A plastic network approach to model calving glacier advance and retreat." Frontiers in Earth Sciences. 5(24). doi: 10.3389/feart.2017.00024 http://ehultee.github.io/files/feart-2017_00024.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

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

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

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

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

Glacial runoff buffers droughts through the 21st century

Published in Earth System Dynamics, 2022

To what extent can we expect that retreating glaciers will continue to moderate droughts around the world?

Recommended citation: Ultee, L., Coats, S., and Mackay, J. (2022). "Glacial runoff buffers droughts through the 21st century." Earth System Dynamics 13: 935-959. https://doi.org/10.5194/esd-13-935-2022 http://ehultee.github.io/files/gSPEI-esd-13-935-2022.pdf

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

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 https://gmd.copernicus.org/articles/15/8269/2022/

Exploring the impact of a frontal ablation parameterization on projected 21st-century mass change for Northern Hemisphere glaciers

Published in Journal of Glaciology, 2023

Excluding frontal ablation can skew future projections of glacier change

Recommended citation: Malles, J.-H. et al. (2023). "Exploring the impact of a frontal ablation parameterization on projected 21st-century mass change for Northern Hemisphere glaciers." Journal of Glaciology 69(277), pp. 1317–1332. doi:10.1017/jog.2023.19. https://www.cambridge.org/core/journals/journal-of-glaciology/article/exploring-the-impact-of-a-frontal-ablation-parameterization-on-projected-21stcentury-mass-change-for-northern-hemisphere-glaciers/1ABFB1057B58B2CC42B0FEE33F346C3F

Published in , 1900

A stochastic parameterization of ice sheet surface mass balance for the Stochastic Ice-Sheet and Sea-Level System Model (StISSM v1.0)

Published in Geoscientific Model Development, 2024

Developing a stochastic ice sheet mass-balance scheme

Recommended citation: Ultee, L., Robel, A. A., and Castruccio, S. (2024). "A stochastic parameterization of ice sheet surface mass balance for the Stochastic Ice-Sheet and Sea-Level System Model (StISSM v1.0)." Geoscientific Model Development 17, 1041-1057. doi:10.5194/gmd-17-1041-2024. https://gmd.copernicus.org/articles/17/1041/2024/

For whom and by whom is glaciology?

Published in Journal of Glaciology, 2024

A need for more representative, co-produced glaciology

Recommended citation: Robel, A. A., Ultee, L., Ranganathan, M., and Nash, M. (2024). "For whom and by whom is glaciology?." Journal of Glaciology. doi:10.1017/jog.2024.29. https://www.cambridge.org/core/journals/journal-of-glaciology/article/for-whom-and-by-whom-is-glaciology/99E59E08B948C2A1B3B83702B30D39A6

Knowing Climate Change

Undergraduate course, University of Michigan, Residential College, 2018

I was instructor of record for this upper-level seminar on multidisciplinary climate literacy, using Community-Based Learning pedagogy. I conceived of the course, created a syllabus, identified community partner organizations, pitched the course to the curriculum committee of U-M’s Residential College, and taught it for the first semester it was offered.

Glaciología y recursos hídricos

Workshop, Clubes de Ciencia, Sede Universidad Nacional de Ingeniería, 2019

Weeklong intensive workshop (in Spanish) on the topic of glacial water resources. Students explored glacier physics through lab experiments, reading scholarly articles, proposing field campaigns, and simulating glaciers with the Open Global Glacier Model.

Glaciology

Undergraduate course, Middlebury College, 2021

An upper-level undergraduate elective in glaciology, focusing on ice dynamics and numerical modelling.

Natural Hazards

Undergraduate course, Middlebury College, 2022

A broad introductory course on the mechanisms and societal impacts of natural hazards. Includes introduction to important topics from both geology and climate science, including: plate tectonics, seismic hazards, volcanism, extreme weather, modern climate change, and management of risk. Focus is on demonstrating the broad interdisciplinary foundation of geosciences while imparting practical hazard awareness for an audience of students who may not take any other science course.

Climate Dynamics

Undergraduate course, Middlebury College, 2022

A new course, required for Earth \& Climate Science majors, on the dynamics of Earth’s climate system.
Emphasis on developing quantitative skills, including simple mathematical modelling and using Python through a Jupyter interface.

Modern Climate Seminar

Undergraduate course, Middlebury College, 2023

An upper-level Earth & Climate Science elective focused on current climate change research.
Emphasis on assessment reports (US National Climate Assessment, IPCC Assessment Reports): how they are produced, what they indicate about the state of the science, and their role in climate change decision-making.