Katharine Kelsey

Dr. Kathy Kelsey
Ph.D • Assistant Professor
Department of Geography & Environmental Sciences

Mailing Address:
Dept. of Geography & Environmental Sciences
Campus Box 172
P.O. Box 173364
Denver, CO 80217-3364

Physical Location:
Auraria Campus
North Classroom Building
Room 3524

Fields of Interest:

Climate Change, Carbon Cycling, Biogeochemistry, Human-Environment Interaction, Arctic


Biography

Dr. Kathy Kelsey is an environmental scientist and Assistant Professor in the Department of Geography and Environmental Sciences at the University of Colorado Denver. Her research investigates the interactions between the biosphere and the atmosphere, specifically how ecosystems respond to climate change, land use, and management practices. While much of her work takes place in Arctic and subalpine environments, her research has recently expanded into urban environments as well. By bridging the gap between field-based ecology and remote sensing, Dr. Kelsey provides critical insights into how both natural and built landscapes are shifting in a warming world.

A specialist in landscape biogeochemistry, Dr. Kelsey’s recent publications examine how rising waters and temperatures trigger rapid change in ecosystem function in coastal wetlands. Beyond her research, she is a dedicated educator and advocate for inclusive science, having served as an instructor for the Alaska Native Science and Engineering Program (ANSEP) and a fellow for the AGU "Voices for Science" program. At CU Denver, she teaches courses on Landscape Biogeochemistry, Environmental Science, and Climate Change, where she emphasizes the practical application of science to solve global environmental challenges.


Education

PhD, Environmental Studies (Biogeosciences) | University of Colorado Boulder | 2015
MS, Geology | University of Colorado Boulder | 2011
BS, Geology | University of Puget Sound | 2007


Chirvasa, C., Petit Bon, M., Bladen, K. K., Kelsey, K. C., Leffler, A. J., Williams, T. J., & Beard, K. H. (2026). Rapid plant functional trait responses to warming, flooding, and herbivory in high-latitude coastal wetlands. Oecologia, 208(3), 40. https://doi.org/10.1007/s00442-026-05876-8 

Kelsey, K. C., Leffler, A. J., Petit Bon, M., Barr, B. N., & Beard, K. H. (2025). Responding to rising waters and temperatures: greenhouse gas flux from a high-latitude coastal wetland. Environmental Research Letters, 20(10), 104040. https://doi.org/10.1088/1748-9326/adff98 

Barr, B.N., Kelsey, K.C., Leffler, A.J., Petit Bon, M., Beard, K.H. (2025) Salinity and moisture influence CO2 and CH4 production from high latitude coastal soils, Journal of Geophysical Research – Biogeosciences 103; DOI: 10.1029/2024JG008629

Crawford, B., Kelsey, K., Ibsen, P., Rees, A., & Charobee, A. (2025). Intra-urban variations in land surface phenology in a semi-arid environment. Environmental Research Letters, 20(1), 14036. https://doi.org/10.1088/1748-9326/ad9759 

Petit Bon, M., Leffler, A. J., Kelsey, K. C., Williams, T. J., & Beard, K. H. (2024). Projected near‐future flooding and warming increase graminoid biomass in a high‐latitude coastal wetland. The Journal of Ecology, 112(12), 2715-2730. https://doi.org/10.1111/1365-2745.14418 

Kelsey, K. C., Højlund Pedersen, S., Leffler, A. J., Sexton, J. O., & Welker, J. M. (2023). Snow and vegetation seasonality influence seasonal trends of leaf nitrogen and biomass in Arctic tundra. Ecosphere (Washington, D.C), 14(5), n/a-n/a. https://doi.org/10.1002/ecs2.4515 

Beard, K. H., Kelsey, K. C., Choi, R. T., Welker, J. M., & Leffler, A. J. (2023). Goose Feces Effects on Subarctic Soil Nitrogen Availability and Greenhouse Gas Fluxes. Ecosystems (New York), 26(1), 187-200. https://doi.org/10.1007/s10021-022-00752-x 

Rodman, K. C., Andrus, R. A., Carlson, A. R., Carter, T. A., Chapman, T. B., Coop, J. D., Fornwalt, P. J., Gill, N. S., Harvey, B. J., Hoffman, A. E., Kelsey, K. C., Kulakowski, D., Laughlin, D. C., Morris, J. E., Negrón, J. F., Nigro, K. M., Pappas, G. S., Redmond, M. D., Rhoades, C. C., . . . Hart, S. J. (2022). Rocky Mountain forests are poised to recover following bark beetle outbreaks but with altered composition. The Journal of Ecology, 110(12), 2929-2949. https://doi.org/10.1111/1365-2745.13999 

Leffler, A. J., Becker, H. A., Kelsey, K. C., Spalinger, D. A., & Welker, J. M. (2022). Short‐term effects of summer warming on caribou forage quality are mitigated by long‐term warming. Ecosphere (Washington, D.C), 13(6), n/a-n/a. https://doi.org/10.1002/ecs2.4104 

Choi, R. T., Petit Bon, M., Leffler, A. J., Kelsey, K. C., Welker, J. M., & Beard, K. H. (2022). Short‐term effects of experimental goose grazing and warming differ in three low‐Arctic coastal wetland plant communities. Journal of Vegetation Science, 33(3), n/a-n/a. https://doi.org/10.1111/jvs.13139 

Kelsey, K. C., Pedersen, S. H., Leffler, A. J., Sexton, J. O., Feng, M., & Welker, J. M. (2021). Winter snow and spring temperature have differential effects on vegetation phenology and productivity across Arctic plant communities. Global Change Biology, 27(8), 1572-1586. https://doi.org/10.1111/gcb.15505 

Ballantyne, A. P., Liu, Z., Anderegg, W. R. L., Yu, Z., Stoy, P., Poulter, B., Vanderwall, J., Watts, J., Kelsey, K., & Neff, J. (2021). Reconciling carbon-cycle processes from ecosystem to global scales. Frontiers in Ecology and the Environment, 19(1), 57-65. https://doi.org/10.1002/fee.2296 

Choi, R. T., Beard, K. H., Kelsey, K. C., Leffler, A. J., Schmutz, J. A., & Welker, J. M. (2020). Early Goose Arrival Increases Soil Nitrogen Availability More Than an Advancing Spring in Coastal Western Alaska. Ecosystems (New York), 23(6), 1309-1324. https://doi.org/10.1007/s10021-019-00472-9 

Chin, A., Simon, G. L., Anthamatten, P., Kelsey, K. C., Crawford, B. R., & Weaver, A. J. (2020). Pandemics and the future of human-landscape interactions. Anthropocene, 31, 100256-100256. https://doi.org/10.1016/j.ancene.2020.100256 

Leffler, A. J., Beard, K. H., Kelsey, K. C., Choi, R. T., Schmutz, J. A., & Welker, J. M. (2019). Delayed herbivory by migratory geese increases summer‐long CO 2 uptake in coastal western Alaska. Global Change Biology, 25(1), 277-289. https://doi.org/10.1111/gcb.14473 

Leffler, A. J., Beard, K. H., Kelsey, K. C., Choi, R. T., Schmutz, J. A., & Welker, J. M. (2019). Cloud cover and delayed herbivory relative to timing of spring onset interact to dampen climate change impacts on net ecosystem exchange in a coastal Alaskan wetland. Environmental Research Letters, 14(8), 84030. https://doi.org/10.1088/1748-9326/ab1c91 

Leffler, A. J., Beard, K. H., Kelsey, K. C., Choi, R. T., Schmutz, J. A., & Welker, J. M. (2019). Delayed herbivory by migratory geese increases summer‐long CO2 uptake in coastal western Alaska. Global Change Biology, 25(1), 277-289. https://doi.org/10.1111/gcb.14473 

Choi, R. T., Beard, K. H., Leffler, A. J., Kelsey, K. C., Schmutz, J. A., & Welker, J. M. (2019). Phenological mismatch between season advancement and migration timing alters Arctic plant traits. The Journal of Ecology, 107(5), 2503-2518. https://doi.org/10.1111/1365-2745.13191 

Beard, K. H., Kelsey, K. C., Leffler, A. J., & Welker, J. M. (2019). The Missing Angle: Ecosystem Consequences of Phenological Mismatch. Trends in Ecology & Evolution (Amsterdam), 34(10), 885-888. https://doi.org/10.1016/j.tree.2019.07.019 

Beard, K. H., Choi, R. T., Leffler, A. J., Carlson, L. G., Kelsey, K. C., Schmutz, J. A., & Welker, J. M. (2019). Migratory goose arrival time plays a larger role in influencing forage quality than advancing springs in an Arctic coastal wetland. PloS one, 14(3), e0213037. https://doi.org/10.1371/journal.pone.0213037 

Redmond, M. D., & Kelsey, K. C. (2018). Topography and overstory mortality interact to control tree regeneration in spruce-fir forests of the southern Rocky Mountains. Forest Ecology and Management, 427, 106-113. https://doi.org/10.1016/j.foreco.2018.05.057 

Kelsey, K. C., Redmond, M. D., Barger, N. N., & Neff, J. C. (2018). Species, Climate and Landscape Physiography Drive Variable Growth Trends in Subalpine Forests. Ecosystems (New York), 21(1), 125-140. https://doi.org/10.1007/s10021-017-0139-7 

Kelsey, K. C., Leffler, A. J., Beard, K. H., Choi, R. T., Schmutz, J. A., & Welker, J. M. (2018). Phenological mismatch in coastal western Alaska may increase summer season greenhouse gas uptake. Environmental Research Letters, 13(4), 44032. https://doi.org/10.1088/1748-9326/aab698 

Redmond, M. D., Kelsey, K. C., Urza, A. K., & Barger, N. N. (2017). Interacting effects of climate and landscape physiography on piñon pine growth using an individual‐based approach. Ecosphere (Washington, D.C), 8(3), n/a-n/a. https://doi.org/10.1002/ecs2.1681 

Lu, X., Kelsey, K. C., Yan, Y., Sun, J., Wang, X., Cheng, G., & Neff, J. C. (2017). Effects of grazing on ecosystem structure and function of alpine grasslands in Qinghai–Tibetan Plateau: a synthesis. Ecosphere (Washington, D.C), 8(1), n/a-n/a. https://doi.org/10.1002/ecs2.1656 

Dilling, L., Kelsey, K. C., Fernandez, D. P., Huang, Y. D., Milford, J. B., & Neff, J. C. (2016). Managing Carbon on Federal Public Lands: Opportunities and Challenges in Southwestern Colorado. Environmental Management (New York), 58(2), 283-296. https://doi.org/10.1007/s00267-016-0714-2 

Love Stowell, S. M., Churchill, A. C., Hund, A. K., Kelsey, K. C., Redmond, M. D., Seiter, S. A., & Barger, N. N. (2015). Transforming Graduate Training in STEM Education. Bulletin of the Ecological Society of America, 96(2), 317-323. https://doi.org/10.1890/0012-9623-96.2.317 

Kelsey, K. C., Barnes, K. L., Ryan, M. G., & Neff, J. C. (2014). Short and long-term carbon balance of bioenergy electricity production fueled by forest treatments. Carbon Balance and Management, 9(1), 6-11. https://doi.org/10.1186/s13021-014-0006-1 

Kelsey, K., & Neff, J. (2014). Estimates of Aboveground Biomass from Texture Analysis of Landsat Imagery. Remote Sensing (Basel, Switzerland), 6(7), 6407-6422. https://doi.org/10.3390/rs6076407 

Kelsey, K. C., Wickland, K. P., Striegl, R. G., & Neff, J. C. (2012). Variation in Soil Carbon Dioxide Efflux at Two Spatial Scales in a Topographically Complex Boreal Forest. Arctic, Antarctic, and Alpine Research, 44(4), 457-468. https://doi.org/10.1657/1938-4246-44.4.457

ENVS 1044: Introduction to Environmental Science
GEOG/ENVS 4010/5010: Landscape Biogeochemistry
GEOG/ENVS 4720/ 5720: Climate Change: Causes, Impacts and Solutions
ENVS 6002: Topics in Environmental Science
PBHL 6623: Global Health Perspectives