Author(s): DANTAS, M. S.; ROSA, R. R.; CALHEIROS, D. F.; VERONESE, T. B.; LIMA, I. B. T. de; HAMILTON, S.

Summary: Inundation seasonal patterns are important in the understanding of tropical floodplain ecosystems dynamics. In this study, we have analyzed data derived from 37-GHz polarization differences observed by the Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR). The passive microwave observations, for 10 Pantanal subregioes, provide an robust signature of inundation dynamics in large wetlands such as the Pantanal. The time series was obtained taking into account the differences between vertically and horizontally polarized brightness temperatures providing a sensitive indicator of the surface water against a vegetation land surface background. Each time series was analyzed by applying the gradient pattern analysis on a multiresolution representation obtained from wavelet decomposition /reconstrution technique. The main result have shown similar variability patterns for the following groups of subregions: (i) Miranda and Piquiri; (ii) Negro and Nhecolandia; (iii) Corixo, Paraguay, Cuiabá and Taquari fan; and (iv) Taquari river and Nabileque. Some hydrological aspects are discussed in order to understand the clusterization found from our results.

Publication year: 2009

Types of publication: Paper in annals and proceedings

Unit: Embrapa Pantanal

Keywords: Pantanal, análise de padrões-gradiente, padrçoes de inundação, varredura multi-canal em microondas, wavelet