One‐at‐a‐time parameter perturbation ensemble of the Community Land Model, version 5.1

Comprehensive land models are subject to significant parametric uncertainty, which can be hard to quantify due to the large number of parameters and high model computational costs. We constructed a large parameter perturbation ensemble (PPE) for the Community Land Model version 5.1 with biogeochemistry configuration (CLM5.1‐BGC). We performed more than 2,000 simulations perturbing 211 parameters across six forcing scenarios. This provides an expansive data set, which can be used to identify the most influential parameters on a wide range of output variables globally, by biome, or by plant functional type. We found that parameter effects can exceed scenario effects and that a small number of parameters explains a large fraction of variance across our ensemble. The most important parameters can differ regionally and also based on the forcing scenario. The software infrastructure developed for this experiment has greatly reduced the human and computer time needed for CLM PPEs, which can facilitate routine investigation of parameter sensitivity and uncertainty, as well as automated calibration.

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Author Kennedy, Daniel ORCID icon
Dagon, Katherine ORCID icon
Lawrence, David M. ORCID icon
Fisher, R. A.
Sanderson, B. M.
Collier, N.
Hoffman, F. M.
Koven, C. D.
Kluzek, Erik ORCID icon
Levis, Samuel ORCID icon
Lu, X.
Oleson, Keith W. ORCID icon
Zarakas, C. M.
Cheng, Yifan ORCID icon
Foster, Adrianna C. ORCID icon
Fowler, Megan ORCID icon
Hawkins, L.
Kavoo, T. ORCID icon
Kumar, S.
Newman, Andrew J. ORCID icon
Lawrence, Peter J. ORCID icon
Li, F.
Lombardozzi, Danica ORCID icon
Luo, Y.
Shuman, J.
Swann, A. L. S.
Swenson, Sean ORCID icon
Tang, Guoqiang ORCID icon
Wieder, William ORCID icon
Wood, Andrew ORCID icon
Publisher UCAR/NCAR - Library
Publication Date 2025-08-01T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2025-12-24T17:44:04.545495
Metadata Record Identifier edu.ucar.opensky::articles:44439
Metadata Language eng; USA
Suggested Citation Kennedy, Daniel, Dagon, Katherine, Lawrence, David M., Fisher, R. A., Sanderson, B. M., Collier, N., Hoffman, F. M., Koven, C. D., Kluzek, Erik, Levis, Samuel, Lu, X., Oleson, Keith W., Zarakas, C. M., Cheng, Yifan, Foster, Adrianna C., Fowler, Megan, Hawkins, L., Kavoo, T., Kumar, S., Newman, Andrew J., Lawrence, Peter J., Li, F., Lombardozzi, Danica, Luo, Y., Shuman, J., Swann, A. L. S., Swenson, Sean, Tang, Guoqiang, Wieder, William, Wood, Andrew. (2025). One‐at‐a‐time parameter perturbation ensemble of the Community Land Model, version 5.1. UCAR/NCAR - Library. https://n2t.net/ark:/85065/d7736wc9. Accessed 05 February 2026.

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