INVESTIGADORES
PEREZ gonzalo luis
artículos
Título:
Temporal variability in inherent and apparent optical properties in a highly turbid, shallow lake (Chascomús, Argentina).
Autor/es:
GONZALO L. PÉREZ; MARÍA LLAMES; LEONARDO LAGOMARSINO; HORACIO ZAGARESE
Revista:
PHOTOCHEMISTRY AND PHOTOBIOLOGY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2011 vol. 87 p. 659 - 670
ISSN:
0031-8655
Resumen:
We study the underwater light field seasonality in a highly turbid lake, Laguna Chascomús (Buenos Aires Province, Argentina). We report (i) relationships between optical properties (OPs) and optically active substances (OASs), (ii) relationships between inherent (IOPs) and apparent (AOPs) optical properties, and (iii) the seasonal variability in OASs, IOPs and AOPs. Light absorption was dominated by the particulate fraction. The contribution of phytoplankton and nonalgal components was similar. The best predictors of total particulate absorption, nonalgal particulate absorption, turbidity, and vertical attenuation coefficient were total suspended solids or their ash content. Many OASs and OPs varied seasonally. The concentrations of OASs were higher during spring and summer, resulting in lower transparency and higher turbidity. However, mass-specific absorption coefficients, displayed lower values during spring and summer. Thus, the higher light attenuation observed during spring and summer resulted from higher concentrations of relatively less absorptive OASs. Collectively, these results suggest that: (i) light extinction is enhanced during spring and summer, (ii) the enhanced light extinction is due to changes in the particulate fraction, and (iii) the enhanced light extinction is mostly due to an increase in the amount of particulate material, which counteracts the decrease in mass-specific light absorption of suspended solids.