ANÁLISE DA TEMPERATURA SUPERFICIAL DE UMA LAGOA COSTEIRA INTEGRADA COM DADOS ORBITAIS E MICROMETEOROLÓGICOS NA PASSAGEM DE SISTEMAS FRONTAIS

Abstract

Water bodies have a very dynamic with different characteristics that undergo changes with the passage of frontal systems. These water systems are influenced by the air temperature, wind and other meteorological quantities. This study presents a method to measure the surface temperature of a coastal lagoon located in southern Brazil using satellite images. During the winter months of 2006 (June, July and August) the surface temperature of the pond was analyzed in the occurrence of six cold frontal systems that passed in the state of Rio Grande do Sul. Surface temperature was estimated from the product MOD11-Surface Temperature and Emissivity, of the sensor Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the EOS-TERRA orbital platform. The results showed that the temperature of the pond decreases after the passage of cold fronts and can be influenced by wind and ambient temperature. The maximum temperatures recorded in the northern region of the lagoon are on average 5 ° C higher at the front entrance than at the exit of cold fronts. This increase is related to the input of nutrients coming from the marsh of Taim. This analysis shows that measures of surface temperature in ponds, obtained by the MODIS sensor, are a feasible and efficient tool to establish relations with the wind originated during the passage of frontal systems.