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Article

Sensitivity of Surface Fluxes in the ECMWF Land Surface Model to the Remotely Sensed Leaf Area Index and Root Distribution: Evaluation with Tower Flux Data

1
Instituto Dom Luiz, IDL, Faculty of Sciences, University of Lisbon, 1749-016 Lisbon, Portugal
2
Department for Biogeochemical Integration, Max Planck Institute for Biogeochemistry, 07743 Jena, Germany
3
European Centre for Medium-Range Weather Forecasts, Shinfield Park, Reading RG2 9AX, UK
4
Instituto Português do Mar e Atmosfera, IPMA, 1749-077 Lisbon, Portugal
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(12), 1362; https://doi.org/10.3390/atmos11121362
Received: 11 November 2020 / Revised: 8 December 2020 / Accepted: 12 December 2020 / Published: 16 December 2020
The surface-atmosphere turbulent exchanges couple the water, energy and carbon budgets in the Earth system. The biosphere plays an important role in the evaporation process, and vegetation related parameters such as the leaf area index (LAI), vertical root distribution and stomatal resistance are poorly constrained due to sparse observations at the spatio-temporal scales at which land surface models (LSMs) operate. In this study, we use the Carbon Hydrology Tiled European Center for Medium-Range Weather Forecasts (ECMWF) Scheme for Surface Exchanges over Land (CHTESSEL) model and investigate the sensitivity of the simulated turbulent fluxes to these vegetation related parameters. Observed data from 17 FLUXNET towers were used to force and evaluate model simulations with different vegetation parameter configurations. The replacement of the current LAI climatology used by CHTESSEL, by a new high-resolution climatology, representative of the station’s location, has a small impact on the simulated fluxes. Instead, a revision of the root profile considering a uniform root distribution reduces the underestimation of evaporation during water stress conditions. Despite the limitations of using only one model and a limited number of stations, our results highlight the relevance of root distribution in controlling soil moisture stress, which is likely to be applicable to other LSMs. View Full-Text
Keywords: root distribution; leaf area index; evaporation; land surface model root distribution; leaf area index; evaporation; land surface model
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MDPI and ACS Style

Stevens, D.; Miranda, P.M.A.; Orth, R.; Boussetta, S.; Balsamo, G.; Dutra, E. Sensitivity of Surface Fluxes in the ECMWF Land Surface Model to the Remotely Sensed Leaf Area Index and Root Distribution: Evaluation with Tower Flux Data. Atmosphere 2020, 11, 1362. https://doi.org/10.3390/atmos11121362

AMA Style

Stevens D, Miranda PMA, Orth R, Boussetta S, Balsamo G, Dutra E. Sensitivity of Surface Fluxes in the ECMWF Land Surface Model to the Remotely Sensed Leaf Area Index and Root Distribution: Evaluation with Tower Flux Data. Atmosphere. 2020; 11(12):1362. https://doi.org/10.3390/atmos11121362

Chicago/Turabian Style

Stevens, David, Pedro M.A. Miranda, René Orth, Souhail Boussetta, Gianpaolo Balsamo, and Emanuel Dutra. 2020. "Sensitivity of Surface Fluxes in the ECMWF Land Surface Model to the Remotely Sensed Leaf Area Index and Root Distribution: Evaluation with Tower Flux Data" Atmosphere 11, no. 12: 1362. https://doi.org/10.3390/atmos11121362

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