Sauce grande shallow lake water temperature estimation using satellite data

FORNERÓN, C.F.; PICCOLO M.C.; CARMONA, F; RIVAS, R.

Workshop; Gleon 14; 2012

Global Lake Ecological Observatory Network (GLEON)

A high number of shallow lakes characterize the Pampean plain of the Buenos Aires province (Argentina). Sometimes it is difficult to access to them in order to obtained simultaneously measurements. Therefore, alternative tools are needed to obtain a systematization of the data that will allow the study of spatial dynamics. In the literature many works prove that satellite data is an exceptional tool for acquiring information about lakes parameters with an adequate spatial, spectral and temporal resolution. The aim of this study is to estimate and validate the temperature of the water in the Sauce Grande shallow lake from Enhanced Thematic Mapper Plus (ETM +) and Thematic Mapper (TM) sensors and in situ measurements recorded with a buoy. Eight satellites images were used to calculate the Sauce Grande water temperature using the radiative transfer equation estimating atmospheric parameters (transmissivity, up and down radiance emitted by the atmosphere) with the MODTRAN 4.0 code. The results showed a BIAS of -0,7 ° C and a standard deviation of 0,8 ° C for combination TM / ETM +. The correlation between the measured water temperate from the buoy and the temperature calculated from satellite sensors were high. An equation was obtained for the Sauce Grande shallow lake to estimate water temperature from satellite data