PNNL

Kalyn Dorheim is an Earth scientist at Pacific Northwest National Laboratory’s (PNNL’s) Joint Global Change Research Institute in College Park, MD. Dorheim joined PNNL in 2017 as a post-bachelor research associate after earning a degree in environmental studies and biology from St. Olaf College. In 2024, she earned a master's in applied and computational mathematics from Johns Hopkins University. She is one of the technical leads for Hector, PNNL’s reduced-complexity Earth system model.

• Energy and mass balance modeling
• Ecological modeling, simulation, and forecasting 
• Disturbance response and recovery

• Process-based modeling 
• Statics 
• Open-source and reproducible science 
• Expert in R, familiar with Python and C++

MS, Applied and Computational Mathematics, Johns Hopkins University, 2024

BA, Biology and Environmental Science, St. Olaf College, 2016

• American Geophysical Union
• European Geophysical Union
• Ecological Society of America
• Letters to a Pre-Scientist – STEM Professional Participant (2017–Present)

• Bringing Excellence in S&T (BESTies) Award in recognition of First Proposal Win (2023)
• BESTies Award for Core Value – Impact in recognition of the Hector v3 Release (2023) by the Earth and Biological Sciences Directorate, PNNL
• Outstanding Performance Award for work on revamping the Global Change Analysis Model (GCAM) data system (2017) by the Earth and Biological Sciences Directorate, PNNL
• American Geophysical Union Student Travel Grant Recipient (2016)
• Honorable mention from the Udall Foundation for the Udall Undergraduate Scholarship (2015)

2025

Brown, J.K., Dorheim, K., Mu, D., Snyder, A.C., Tebaldi, C., & Bond-Lamberty, B. (2025). The effect of different climate sensitivity priors on projected climate: A probabilistic analysis. Geophysical Research Letters 52, no. 9:e2024GL113505. doi:10.1029/2024GL113505.

Haber, L. T., Bond-Lamberty, B., Chan, D., Dorheim, K., Matthes, J. H., & Gough, C. (2025). Simulating biotic disturbance responses in forests requires a balance of model performance, complexity, and accessibility. Ecological Modelling, 502(111033), 111033. https://doi.org/10.1016/j.ecolmodel.2025.111033

2024

Snyder, A., Prime, N., Tebaldi, C., & Dorheim, K. (2024). Uncertainty-informed selection of CMIP6 Earth system model subsets for use in multisectoral and impact models. Earth System Dynamics, 15(5), 1301–1318. https://doi.org/10.5194/esd-15-1301-2024 

Dorheim, K., Gering, S., Gieseke, R., Hartin, C., Pressburger, L., Shiklomanov, A. N., Smith, S. J., Tebaldi, C., Woodard, D. L., & Bond-Lamberty, B. (2024). Hector V3.2.0: functionality and performance of a reduced-complexity climate model. Geoscientific Model Development, 17(12), 4855–4869. https://doi.org/10.5194/gmd-17-4855-2024

Zhao, M., Khan, Z., Dorheim, K., & Vernon, C. (2024). helios: An R package to process heating and cooling degrees for GCAM. Journal of Open Source Software, 9(94), 6033. https://doi.org/10.21105/joss.06033

Brown, J. K., Pressburger, L., Snyder, A., Dorheim, K., Smith, S. J., Tebaldi, C., & Bond-Lamberty, B. (2024). Matilda v1.0: An R package for probabilistic climate projections using a reduced complexity climate model. PLOS Climate, 3(5), e0000295. 

Séférian, R., Bossy, T., Gasser, T., Nichols, Z., Dorheim, K., Su, X., Tsutsui, J., & Santana-Falcón, Y. (2024). Physical inconsistencies in the representation of the ocean heat-carbon nexus in simple climate models. Communications Earth & Environment, 5(1), 291.

2023

Pressburger, L., Dorheim, K., Keenan, T. F., McJeon, H., Smith, S. J., & Bond-Lamberty, B. (2023). Quantifying airborne fraction trends and the destination of anthropogenic CO2 by tracking carbon flows in a simple climate model. Environmental Research Letters, 18(5), 054005.

2022 

Dorheim, K., Gough, C. M., Haber, L. T., Mathes, K. C., Shiklomanov, A. N., & Bond-Lamberty, B. (2022). Climate drives modeled forest carbon cycling resistance and resilience in the Upper Great Lakes Region, USA. Journal of Geophysical Research: Biogeosciences, 127(1), e2021JG006587.

Jian, J., Bailey, V., Dorheim, K., Konings, A. G., Hao, D., Shiklomanov, A. N., Snyder, A., Steele, M., Teramoto, M., Vargas, R., & Others. (2022). Historically inconsistent productivity and respiration fluxes in the global terrestrial carbon cycle. Nature Communications, 13(1), 1733.

Snyder, A. C., Dorheim, K. R., Tebaldi, C., & Vernon, C. R. (2024). STITCHES: a Python package to amalgamate existing Earth system model output into new scenario realizations. Journal of Open Source Software, 9(97), 5525. https://doi.org/10.21105/joss.05525

Tebaldi, C., Snyder, A., & Dorheim, K. (2022). STITCHES: creating new scenarios of climate model output by stitching together pieces of existing simulations. Earth System Dynamics, 13(4), 1557–1609.

2021 

Gough, C. M., Atkins, J. W., Bond-Lamberty, B., Agee, E. A., Dorheim, K. R., Fahey, R. T., Grigri, M. S., Haber, L. T., Mathes, K. C., Pennington, S. C., & Others. (2021). Forest structural complexity and biomass predict first-year carbon cycling responses to disturbance. Ecosystems, 24, 699–712.

Hartin, C., Link, R., Patel, P., Mundra, A., Horowitz, R., Dorheim, K., & Clarke, L. (2021). Integrated modeling of human-earth system interactions: An application of GCAM-fusion. Energy Economics, 103, 105566.

Jian, J., Bond-Lamberty, B., Hao, D., Sulman, B. N., Patel, K. F., Zheng, J., Dorheim, K., Pennington, S. C., Hartman, M. D., Warner, D., & Others. (2021). Leveraging observed soil heterotrophic respiration fluxes as a novel constraint on global-scale models. Global Change Biology, 27(20), 5392–5403.

Tebaldi, C., Dorheim, K., Wehner, M., & Leung, R. (2021). Extreme metrics from large ensembles: investigating the effects of ensemble size on their estimates. Earth System Dynamics, 12(4), 1427–1501.

Mathes, K. C., Ju, Y., Kleinke, C., Oldfield, C., Bohrer, G., Bond-Lamberty, B., Vogel, C. S., Dorheim, K., & Gough, C. M. (2021). A multidimensional stability framework enhances interpretation and comparison of carbon cycling response to disturbance. Ecosphere, 12(11), e03800.

Dorheim, K., Smith, S. J., & Bond-Lambery, B. (2021). HIRM v1.0: a hybrid impulse response model for climate modeling and uncertainty analyses. Geosci. Model Dev., 14, 365–375.

Nicholls, Z., Meinshausen, M., Lewis, J., Corradi, M. R., Dorheim, K., Gasser, T., Gieseke, R., Hope, A. P., Leach, N. J., McBride, L. A., & Others. (2021). Reduced complexity model intercomparison project phase 2: synthesizing earth system knowledge for probabilistic climate projections. Earth’s Future, 9(6), e2020EF001900.

2020

Nicholls, Z. R. J., Meinshausen, M., Lewis, J., Gieseke, R., Dommenget, D., Dorheim, K., Fan, C.-S., Fuglestvedt, J. S., Gasser, T., Golüke, U., Goodwin, P., Hartin, C., Hope, A. P., Kriegler, E., Leach, N. J., Marchegiani, D., McBride, L. A., Quilcaille, Y., Rogelj, J., … Xie, Z. (2020). Reduced Complexity Model Intercomparison Project Phase 1: introduction and evaluation of global-mean temperature response. Geoscientific Model Development, 13(11), 5175–5190. https://doi.org/10.5194/gmd-13-5175-2020

Smith, S. J., Chateau, J., Dorheim, K., Drouet, L., Durand-Lasserve, O., Fricko, O., Fujimori, S., Hanaoka, T., Harmsen, M., Hilaire, J., & Others. (2020). Impact of methane and black carbon mitigation on forcing and temperature: a multi-model scenario analysis. Climatic Change, 163, 1427–1442.

Binsted, M., Iyer, G., Cui, R., Khan, Z., Dorheim, K., & Clarke, L. (2020). Evaluating long-term model-based scenarios of the energy system. Energy Strategy Reviews, 32, 100551. https://doi.org/10.1016/j.esr.2020.100551

Atkins, J. W., Agee, E., Barry, A., Dahlin, K. M., Dorheim, K., Grigri, M. S., Haber, L. T., Hickey, L. J., Kamoske, A. G., Mathes, K., & Others. (2020). The fortedata R package: open-science datasets from a manipulative experiment testing forest resilience. Earth System Science Data Discussions, 2020, 1–18.

Dorheim, K., Link, R., Hartin, C., Kravitz, B., & Snyder, A. (2020). Calibrating Simple Climate Models to Individual Earth System Models: Lessons Learned From Calibrating Hector. Earth and Space Science, 7(11), e2019EA000980.

2019 

Snyder, A., Link, R., Dorheim, K., Kravitz, B., Bond-Lamberty, B., & Hartin, C. (2019). Joint emulation of Earth System Model temperature-precipitation realizations with internal variability and space-time and cross-variable correlation: fldgen v2. 0 software description. Plos One, 14(10), e0223542.

Bond-Lamberty, B., Dorheim, K., Cui, R., Horowitz, R., Snyder, A., Calvin, K., Feng, L., Hoesly, R., Horing, J., Kyle, G. P., & Others. (2019). gcamdata: An R package for preparation, synthesis, and tracking of input data for the GCAM integrated human-earth systems model. Journal of Open Research Software, 7.

Calvin, K., Patel, P., Clarke, L., Asrar, G., Bond-Lamberty, B., Cui, R. Y., Di Vittorio, A., Dorheim, K., Edmonds, J., Hartin, C., & Others. (2019). GCAM v5. 1: Representing the linkages between energy, water, land, climate, and economic systems. Geoscientific Model Development, 12(2), 677–698.