Articles | Volume 29, issue 18
https://doi.org/10.5194/hess-29-4637-2025
https://doi.org/10.5194/hess-29-4637-2025
Research article
 | 
25 Sep 2025
Research article |  | 25 Sep 2025

Evaluation of hydroclimatic biases in the Community Earth System Model (CESM1) within the Mississippi River basin

Michelle O'Donnell, Kelsey Murphy, James Doss-Gollin, Sylvia Dee, and Samuel Munoz

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Cited articles

Abram, N. J., Wright, N. M., Ellis, B., Dixon, B. C., Wurtzel, J. B., England, M. H., Ummenhofer, C. C., Philibosian, B., Cahyarini, S. Y., Yu, T.-L., Shen, C.-C., Cheng, H., Edwards, R. L., and Heslop, D.: Coupling of Indo-Pacific climate variability over the last millennium, Nature, 579, 385–392, https://doi.org/10.1038/s41586-020-2084-4, 2020. 
Alexander, J. S., Wilson, Richard C., and Green, W. R.: A brief history and summary of the effects of river engineering and dams on the Mississippi River system and delta, U.S. Geological Survey, Circular 1375, 2012. 
Becker, A., Finger, P., Meyer-Christoffer, A., Rudolf, B., Schamm, K., Schneider, U., and Ziese, M.: A description of the global land-surface precipitation data products of the Global Precipitation Climatology Centre with sample applications including centennial (trend) analysis from 1901–present, Earth Syst. Sci. Data, 5, 71–99, https://doi.org/10.5194/essd-5-71-2013, 2013. 
Benedict, I., van Heerwaarden, C. C., Weerts, A. H., and Hazeleger, W.: An evaluation of the importance of spatial resolution in a global climate and hydrological model based on the Rhine and Mississippi basin, Hydrol. Earth Syst. Sci. Discuss. [preprint], https://doi.org/10.5194/hess-2017-473, 2017. 
Brookfield, A. E., Ajami, H., Carroll, R. W. H., Tague, C., Sullivan, P. L., and Condon, L. E.: Recent advances in integrated hydrologic models: Integration of new domains, J. Hydrol., 620, 129515, https://doi.org/10.1016/j.jhydrol.2023.129515, 2023. 
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Short summary
We investigate the skill of the Community Earth System Model version 1 (CESM1) in simulating hydrologic processes over the Mississippi River basin. Simulated discharge is seasonally delayed relative to observations: model biases are diagnosed using variables from reanalysis data and attributed primarily to precipitation and runoff related processes. We also show that the seasonality of simulated runoff in several Coupled Model Intercomparison Phase 6 (CMIP6) models is improved relative to CESM1.
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