Related Experiment Video
Updated: Jun 24, 2026

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
Published on: June 13, 2020
Variability in photobleaching yields and their related impacts on optical conditions in subtropical lakes
Steven A Loiselle1, Luca Bracchini, Andres Cózar
1Environmental Spectroscopy Lab, Dipt. Farmico Chimico Tecnologico, CSGI, University of Siena, via Aldo Moro 1, 53100 Siena, Italy. loiselle@unisi.it
Abstract:
Changes in the concentration and spectral absorption of chromophoric dissolved 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.
More Related Videos
Related Concept Videos
Freshwater Microbial Ecology
Variables Affecting Phosphorescence and Fluorescence
Testing a Claim about Mean: Known Population SD
Estimating a population mean requires the samples to be distributed normally. The data should be collected from the randomly selected samples having no sampling bias. The sample size needed to be higher than 30, and most importantly, the population standard deviation should be already known.
In most realistic situations, the population standard deviation is often unknown, but in rare circumstances, when it...
Marine Microbial Ecology

