Abstract
Abstract. This work presents ongoing efforts and preliminary results for building a dataset that represents the first and most comprehensive bio-optical information available on Brazilian inland waters to support the development of remote sensing algorithms for monitoring aquatic systems. From 2012 to 2014 optical and limnological data was gathered along thirteen field campaigns in five Brazilian reservoirs, in an irrigation and domestic water supply reservoir located in semi-arid northeast of the country and in Amazonian floodplain lakes, thus covering the diversity of Brazilian inland waters. At each site 20 stations, on average, were sampled to acquire profiles of the following optical variables: absorption, attenuation, scattering, and backscattering coefficients and radiances/irradiances spectra above and in-water. Alongside these measurements, water samples were collected for determining concentrations of chlorophyll-a (Chl-a), Total Suspended Solid (TSS), Total Dissolved Carbon (TDC) and its organic/inorganic fractions, CDOM absorption, phytoplankton specific absorption [aph*] and Non-Algal Particles absorption [aNAP*]. Preliminary results show that Chl-a concentrations ranged from 0.6 to 243μg/L in reservoirs and 0.90 to 92μg/L in Amazonian lakes, while TSS concentrations ranged from 0.3 to 31mg/L in reservoirs and 0.5 to 162mg/L in Amazonian lakes. In situ beam attenuation coefficients ranged from 1.4 to 16m-1 in reservoirs and 12.5 to 38m-1 in Amazonian lakes, while diffuse attenuation coefficients of downwelling irradiance over the Photosynthetically Active Radiation (Kd(PAR)) extended from 0.35 to 4.5m-1 in reservoirs and 1.69 to 13.30m-1 in Amazonian lakes. Our research group is building this dataset anticipating future demands for algorithm validation regarding OLI/Landsat8 data and ESA Sentinel missions to be launched as of 2015.
Highlights
Water is a natural resource essential to life
12% of available fresh water for use on Earth passes through the Brazilian territory
In this paper we present the preliminary results of this dataset which is the first and most comprehensive bio-optical information available for the Brazilian inland waters giving the grounds for better knowledge of the connections between aquatic system bio-optical properties and carbon budget as well as of the anthropogenic impacts on bio-optical properties
Summary
Water is a natural resource essential to life. Water is essential for economic development and social welfare, since economic growth depends on the water availability of the nations. 12% of available fresh water for use on Earth passes through the Brazilian territory. Due to this water availability, Brazil has an enormous number of natural and artificial aquatic systems of large dimensions. Estimates point out the existence of more than 8,000 lakes larger than one hectare in the Amazonian floodplain, of which less than 1% has been effectively studied. The area flooded by the 150 largest Brazilian hydroelectric reservoirs is approximately 45 103 km
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