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Instituto Nacional de Pesquisas Espaciais – INPE (2008)

Calibração do "Simplified Simple Biosphere Model - SSiB" para o Bioma Caatinga do Nordeste Brasileiro

Cunha Ana Paula Martins do Amaral

Titre : Calibração do "Simplified Simple Biosphere Model - SSiB" para o Bioma Caatinga do Nordeste Brasileiro

Auteur : Cunha Ana Paula Martins do Amaral

Université de soutenance : Instituto Nacional de Pesquisas Espaciais – INPE

Grade : Mestrado em Meteorologia 2008

Résumé
The Simplified Simple Biosphere Model (SSiB) calculates the energy and moisture turbulent changes between vegetated surface and atmosphere. Considering that the SSiB model needs several parameters, an incorrect or insufficient representation of these parameters may cause a wrong partition of the turbulent fluxes at the surface. Thus, the objective of this work is performing a monthly calibration of the parameters of SSiB model for the Brazilian Northeast Caatinga. Micrometeorological and hydrological data collected during the period from July 2004 to June 2005, obtained in the Agricultural Research Center of the Semi-Arid Tropic (CPATSA), were used. Previously from the calibration process, a sensibility study of SSiB was performed in order to find the parameters that are sensible to the exchanges processes between the surface and atmosphere. The results showed that the B parameter, soil moisture potential at saturation (s), hydraulic conductivity of saturated soil (ks) and the volumetric moisture at saturation (s) allow high variations on turbulent flux. With the initial parameters, the SSiB model showed better results for net radiation. The latent heat (sensible heat) flux was super-estimated (under-estimated) for all period of simulation, what should be related to the parameters used in the calculations of these variables. Considering the calibrated parameters, better values of latent flux and sensible flux have been obtained. The calibrated parameters were also used for a validation of the surface fluxes considering data from July 2005 to September 2005. The results showed the model generated better estimations of latent heat and sensible heat fluxes ; with high values for correlation coefficients and low error BIAS and root mean squared error. With the better estimations of the turbulent fluxes, it was possible to obtain more representative energy partitioning in caatinga. Therefore, it is expected that from this calibrated SSiB model, coupled to the meteorological models, it will be possible to obtain more realistic climate and weather forecasts for the Brazilian northeast region. Version intégrale

Page publiée le 3 avril 2019