Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2017-203
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
24 Apr 2017
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Hydrology and Earth System Sciences (HESS).
Simulation of Surface Fluxes in Two Distinct Environments along a Topographic Gradient in a Central Amazonian Forest using the INtegrated LAND Surface Model
Elisângela Broedel1, Celso Von Randow1, Luz Adriana Cuartas2, Antonio Donato Nobre6, Alessandro Carioca de Araújo4, Bart Kruijt3, Etienne Tourigny5, Luiz Antônio Cândido6, Martin Hodnett7, and Javier Tomasella1 1Earth System Science Center, National Institute for Space Research (INPE), São José dos Campos, Brazil
2Brazilian Center for Monitoring and Warning of Natur al Disasters (CEMADEN), São José dos Campos, Brazil
3Alterra Research Institute, Wageningen University, Wageningen, Netherlands
4Brazilian Agricultural Research Corporation (EMBRAPA), Belém, Brazil
5Barcelona Supercomputing Center (BSC), Barcelona, Spain
6Large Scale Biosphere-Atmosphere Experiment in Ama zônia (LBA), National Institute for Amazonian Research (INPA), Manaus, Amazonas, Brazil
7Centre for Ecology and Hydrology, Wallingford, Oxfordshire, United Kingdom
Abstract. The Integrated Land Surface model (INLAND) land surface model, in offline mode, was adjusted and forced with prescribed climate to represent two contrasting environments along a topographic gradient in a central Amazon Terra Firme forest, which is distinguished by well-drained, flat plateaus and poorly drained, broad river valleys. To correctly simulate the valley area, a lumped unconfined aquifer model was included in the INLAND model to represent the water table dynamics and results show reasonable agreement with observations. Field data from both areas are used to evaluate the model simulations of energy, water and carbon fluxes. The model is able to characterize with good accuracy the main differences that appear in the seasonal energy and carbon partitioning of plateau and valley fluxes, which are related to features of the vegetation associated with soils and topography. The simulated latent heat flux (LE) and net ecosystem exchange of carbon (NEE), for example, are higher on the plateau area while at the bottom of the valley the sensible heat flux (H) is noticeably higher than at the plateau, in agreement with observed data. Differences in simulated hydrological fluxes are also linked to the topography, showing a higher surface runoff (R) and lower evapotranspiration (ET) in the valley area. The different behavior of the fluxes on both annual and diurnal time scales confirms the benefit of a tiling mechanism in the presence of large contrast and the importance to incorporate subgrid-scale variability by including relief attributes of topography, soil and vegetation to better representing Terra Firme forests in land surface models.

Citation: Broedel, E., Von Randow, C., Cuartas, L. A., Nobre, A. D., de Araújo, A. C., Kruijt, B., Tourigny, E., Cândido, L. A., Hodnett, M., and Tomasella, J.: Simulation of Surface Fluxes in Two Distinct Environments along a Topographic Gradient in a Central Amazonian Forest using the INtegrated LAND Surface Model, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2017-203, in review, 2017.
Elisângela Broedel et al.
Elisângela Broedel et al.
Elisângela Broedel et al.

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Short summary
This work describes the simulation of surface fluxes in two distinct environments along a topographic gradient in a central Amazonian forest using the INLAND Model. The results show that a surface model can capture the small differences related to energy, water and carbon balance between both sites. These confirms the importance to incorporate subgrid scale variability by including relief attributes of topography, soil and vegetation to better representing Terra Firme forests in these models.
This work describes the simulation of surface fluxes in two distinct environments along a...
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