Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12779/5635
Title: Variability in photobleaching yield and their related impacts on optical conditions in subtropical lakes
Authors: Loiselle, Steven Arthur 
Bracchini, L.
Cozar, A.
Dattilo, A.
Tognazzi, A.
Rossi, Claudio 
Keywords: CDOM; Photodegradation; Photobleaching; Conservative mixing; Lakes; Argentina
Issue Date: 2009
Project: None 
Journal: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
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.
Description: 
22126
URI: http://hdl.handle.net/20.500.12779/5635
ISSN: 1011-1344
DOI: 10.1016/j.jphotobiol.2009.02.002
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