organic matter (CDOM) may strongly condition the optical properties of tropical and subtropical water bodies. We examined the spatial distribution of CDOM-related absorption, spectral slope and vertical attenuation of solar radiation in two shallow lakes in the Esteros del Iberá wetland system. In situ measurements were made to examine spatial variations in photobleaching yields in natural lake conditions. The results showed that “fresh” allochthonous CDOM is more susceptible to phototransformations than either “aged” allochthonous organic matter or autochthonous sources, if the distances from sources are considered as proxies for residence time. Based on measured changes in absorption spectral slope in relation to solar ultraviolet irradiance, a model was developed which used CDOM as a non-conservative tracer of water masses. Spatial changes in CDOM absorption within the lake were then used to compare photo related transformations to those associated with conservative mixing.

Loiselle, S.A., Bracchini, L., Cozar, A., Dattilo, A., Tognazzi, A., & Rossi, C. (2009). Variability in photobleaching yield and their related impacts on optical conditions in subtropical lakes. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY, 95(2), 129-137 [10.1016/j.jphotobiol.2009.02.002].

Variability in photobleaching yield and their related impacts on optical conditions in subtropical lakes

Loiselle, Steven Arthur
;
BRACCHINI, LUCA;DATTILO, ARDUINO MASSIMO;TOGNAZZI, ANTONIO;Rossi, Claudio
2009

Abstract

organic matter (CDOM) may strongly condition the optical properties of tropical and subtropical water bodies. We examined the spatial distribution of CDOM-related absorption, spectral slope and vertical attenuation of solar radiation in two shallow lakes in the Esteros del Iberá wetland system. In situ measurements were made to examine spatial variations in photobleaching yields in natural lake conditions. The results showed that “fresh” allochthonous CDOM is more susceptible to phototransformations than either “aged” allochthonous organic matter or autochthonous sources, if the distances from sources are considered as proxies for residence time. Based on measured changes in absorption spectral slope in relation to solar ultraviolet irradiance, a model was developed which used CDOM as a non-conservative tracer of water masses. Spatial changes in CDOM absorption within the lake were then used to compare photo related transformations to those associated with conservative mixing.
Loiselle, S.A., Bracchini, L., Cozar, A., Dattilo, A., Tognazzi, A., & Rossi, C. (2009). Variability in photobleaching yield and their related impacts on optical conditions in subtropical lakes. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY, 95(2), 129-137 [10.1016/j.jphotobiol.2009.02.002].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11365/9303