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An investigation of water transparency characteristics and light attenuation by waters of a turbid subtropical impoundment showed that allochthonous inputs of silt during summer floods, impoundment morphometry, and the warm monomictic thermal cycle were the main factors regulating the temporal and spatial variations in water transparency . Statistically significant relationships between the Secchi disc transparency, turbidity of the surface water, mean diffuse attenuation coefficient and beam attenuation coefficient, were established . These relationships allowed for an approximation of the I per cent of surface light intensity depth to be made by using any of the four parameters . The attenuation of blue light was greater than that of red light, owing to the effects of suspended clay particles on the spectral attenuation of light.

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The "Reflective Optics System Imaging Spectrometer" (ROSIS) is a compact, programmable imaging spectrometer based on a CCD matrix detector array. The optics of the system is made of reflective components only. The present horizontal resolution is 500 pixels across -track for a one -camera system with 32 selectable channels out of 85 within the spectral range 430 -850 nm. The spectral mode permits all 85channels to be read using every third across -track pixel. The instrument has been designed specifically for the monitoring of water colour and of natural chlorophyll fluorescence in order to derive concentrations of phytoplankton chlorophyll and other pigments, suspeded matter and yellow substance, and to map their horizontal distribution in the sea. However, its high spectral resolution (of 5 nm) and flexibility also permits new applications in the remote sensing of atmospheric parameters such as cloud -top height and vegetation monitoring. An airborne prototype of ROSIS is being jointly developed at present by MBB, GKSS and DFVLR. ABSTRACTThe "Reflective Optics System Imaging Spectrometer" (ROSIS) is a compact, programmable imaging spectrometer based on a CCD matrix detector array. The optics of the system is made of reflective components only. The present horizontal resolution is 500 pixels across-track for a one-camera system with 32 selectable channels out of 85 within the spectral range 430 -850 nm. The spectral mode permits all 85 channels to be read using every third across-track pixel. The instrument has been designed specifically for the monitoring of water colour and of natural chlorophyll fluorescence in order to derive concentrations of phytoplankton chlorophyll and other pigments, suspeded matter and yellow substance, and to map their horizontal distribution in the sea. However, its high spectral resolution (of <5 nm) and flexibility also permits new applications in the remote sensing of atmospheric parameters such as cloud-top height and vegetation monitoring. An airborne prototype of ROSIS is being jointly developed at present by MBB, GKSS and DFVLR.

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