Evaluating runoff simulations from the Community Land Model 4.0 using observations from flux towers and a mountainous watershed
Journal Article
·
· Journal of Geophysical Research. D. (Atmospheres), 116:Article No. D24120
Previous studies using the Community Land Model (CLM) focused on simulating landatmosphere interactions and water balance at continental to global scales, with limited attention paid to its capability for hydrologic simulations at watershed or regional scales. This study evaluates the performance of CLM 4.0 (CLM4) for hydrologic simulations, and explores possible directions of improvement. Specifically, it is found that CLM4 tends to produce unrealistically large temporal variation of runoff for applications at a mountainous catchment in the Northwest United States where subsurface runoff is dominant, as well as at a few flux tower sites. We show that runoff simulations from CLM4 can be improved by: (1) increasing spatial resolution of the land surface representations; (2) calibrating parameter values; (3) replacing the subsurface formulation with a more general nonlinear function; (4) implementing the runoff generation schemes from the Variability Infiltration Capacity (VIC) model. This study also highlights the importance of evaluating both the energy and water fluxes application of land surface models across multiple scales.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1032682
- Report Number(s):
- PNNL-SA-79456
- Journal Information:
- Journal of Geophysical Research. D. (Atmospheres), 116:Article No. D24120, Journal Name: Journal of Geophysical Research. D. (Atmospheres), 116:Article No. D24120 Vol. 116
- Country of Publication:
- United States
- Language:
- English
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