Personal profile
Research Interests
Ice and Climate: Glaciology, Snow Hydrology, Climate Science
My research is focused on the interactions and feedbacks between the cryosphere (the frozen world) and the climate system. This work is motivated by societal need to understand the climate system and how it changes, project sea level rise, and manage water resources. I employ methods of computer modeling, data analysis, and field instrumentation. My field research is conducted on the Greenland Ice Sheet, small glaciers in Alaska and Montana, and seasonal snow in Montana. My research is funded by the U.S. National Science Foundation, NASA, and the Swedish Nuclear Waste Management Organization.
Teaching Experience
- GEOS 318: Earth's Changing Climate
- GEOS 488: Snow Ice and Climate
- GEOS 508: Onboarding to Scientific Practice and Culture
- GEOS 548: Advanced Topics in the Cryosphere
- GEOS 568: Climate Sensitivity and Feedbacks
Expertise related to UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This person’s work contributes towards the following SDG(s):
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SDG 3 Good Health and Well-being -
SDG 6 Clean Water and Sanitation -
SDG 7 Affordable and Clean Energy -
SDG 13 Climate Action -
SDG 14 Life Below Water -
SDG 15 Life on Land
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Collaborations and top research areas from the last five years
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Depth of Liquid Water Infiltration in Greenland Firn Based on L-Band Radiometry, a Snow Physics Model, and Machine Learning
Moon, T. D., Harper, J. T., Hossan, A. & Colliander, A., 2026, In: IEEE Transactions on Geoscience and Remote Sensing. 64, 4300915.Research output: Contribution to journal › Article › peer-review
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Evaluation of wet snow dielectric mixing models for L-band radiometric measurement of liquid water content in Greenland's percolation zone
Hossan, A., Colliander, A., Schlegel, N. J., Harper, J., Andrews, L., Kolassa, J., Miller, J. Z. & Cullather, R., Nov 21 2025, In: Cryosphere. 19, 11, p. 6077-6102 26 p.Research output: Contribution to journal › Article › peer-review
Open Access -
Kinetic grain growth in firn induced by meltwater infiltration on the Greenland Ice Sheet
Gehl, K. L., Harper, J. T. & Humphrey, N. F., Dec 16 2025, In: Cryosphere. 19, 12, p. 6791-6805 15 p.Research output: Contribution to journal › Article › peer-review
Open Access -
L-band radiometric measurement of liquid water in Greenland’s firn: Comparative analysis with in situ measurements and modeling
Moon, T., Harper, J., Colliander, A., Hossan, A. & Humphrey, N., Jun 26 2025, In: Annals of Glaciology. 66, e15.Research output: Contribution to journal › Article › peer-review
Open Access5 Scopus citations -
Retrieval and validation of total seasonal liquid water amounts in the percolation zone of the Greenland ice sheet using L-band radiometry
Hossan, A., Colliander, A., Vandecrux, B., Schlegel, N. J., Harper, J., Marshall, S. & Miller, J. Z., Oct 6 2025, In: Cryosphere. 19, 10, p. 4237-4258 22 p.Research output: Contribution to journal › Article › peer-review
Open Access5 Scopus citations