Estimativa do saldo de radiação a partir de dados meteorológicos medidos e de reanálise e produtos MODIS MCD43A, MOD09A1 e MOD11A2 no Pantanal de Mato Grosso

Abstract

Reanalysis products have been used in remote regions of the globe, in parallel with remote sensing techniques, mainly due to the lack of resources for field equipment installation, which has allowed to monitor different microclimates with low operating cost and low errors. The present study evaluated the radiation balance estimates using measured meteorological, reanalysis data and the MODIS MODIS MCD43A, MOD09A1 and MOD11A2 products in the Mato Grosso Pantanal. The measured meteorological data, reanalysis and MODIS products were obtained at the Baía das Pedras Advanced Research Base, in Poconé, Mato Grosso, between 15/06/2011 and 09/08/2015. The meteorological data estimated by reanalysis and by the MCD43A and MOD09A1 products, as well as the instantaneous (Rn) and daily (Rn24h) radiation balance, were compared to the values measured at the meteorological station. The reanalysis products had low errors, high agreement (d), of which 93.0% to 98.0% of estimates met the limits of agreement, and high correlation with the measured values. The Mean Absolute Error (EMA) of Rn and Rn24h estimated using reanalysis data, compared to the measured ones, was 72.0 W m-2

and 24.2 W m-2

, while the percentage bias (PBIAS) was -6.0% and 12.0% and the agreement coefficient 0.70 and 0.82, respectively. The EMA, PBIAS and d were on average 8.0%, 18.0% and 27.0% lower in the radiation balance (Rn and Rn24h) estimated with reanalysis meteorological data than estimated with measured data.