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dc.contributor.author
Osburn, Christopher L.
dc.contributor.author
Zagarese, Horacio Ernesto
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dc.contributor.author
Morris, Donald P.
dc.contributor.author
Hargreaves, Bruce R.
dc.contributor.author
Cravero, Walter Ruben
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dc.date.available
2019-03-15T21:17:05Z
dc.date.issued
2001-12
dc.identifier.citation
Osburn, Christopher L.; Zagarese, Horacio Ernesto; Morris, Donald P.; Hargreaves, Bruce R.; Cravero, Walter Ruben; Calculation of spectral weighting functions for the solar photobleaching of chromophoric dissolved organic matter in temperate lakes; American Society of Limnology and Oceanography; Limnology and Oceanography; 46; 6; 12-2001; 1455-1467
dc.identifier.issn
0024-3590
dc.identifier.uri
http://hdl.handle.net/11336/71793
dc.description.abstract
The effect of solar radiation on the dissolved absorption coefficient (aCDOM[λ]), which reflects the concentration of chromophoric dissolved organic matter (CDOM), was investigated in several lakes near Bariloche, Argentina and in northeastern Pennsylvania, USA. Samples of 0.2 μm filtered lake water were exposed in quartz tubes to different portions of the solar spectrum using optical cutoff filters to remove parts of the ultraviolet (UV) region of the solar spectrum. Changes in the spectral absorption in these samples and the absorbed incident energy were used to calculate spectral weighting functions (SWFs) for the photobleaching (PB) of CDOM. PB was measured as the loss of aCDOM(λ) (the aCDOM[λ] was averaged from 280 to 500 nm) per unit absorbed energy. CDOM from humic and clear lakes, as well as from a Sphagnum bog and an algal culture, was used in the experiments covering a wide range of carbon sources. We used an iterative, nonlinear optimization method to fit the measured results to a simple exponential function in order to generate each SWF. Comparing individual SWFs calculated for various CDOM sources, we computed a summary SWF from the experiments using epilimnial CDOM from our study lakes. Our summary SWF was able to explain 80-90% of the observed variance in our exposure experiments, and we were able to predict PB results obtained for other Argentine lakes (mean error 14.5%). Finally, we calculated that the effect of UV-B radiation on PB was small (<20% of total decrease in the absorption coefficient) compared to UV-A and blue light radiation. This suggested that increased UV-B radiation due to stratospheric ozone depletion would not greatly increase the photobleaching of whole water column CDOM in Patagonian lakes (<10%).
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Society of Limnology and Oceanography
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Calculation of spectral weighting functions for the solar photobleaching of chromophoric dissolved organic matter in temperate lakes
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-03-15T19:23:20Z
dc.journal.volume
46
dc.journal.number
6
dc.journal.pagination
1455-1467
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Nueva York
dc.description.fil
Fil: Osburn, Christopher L.. Lehigh University. Department of Earth and Environmental Sciences; Estados Unidos
dc.description.fil
Fil: Zagarese, Horacio Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Morris, Donald P.. Lehigh University. Department of Earth and Environmental Sciences; Estados Unidos
dc.description.fil
Fil: Hargreaves, Bruce R.. Lehigh University. Department of Earth and Environmental Sciences; Estados Unidos
dc.description.fil
Fil: Cravero, Walter Ruben. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Física del Sur. Universidad Nacional del Sur. Departamento de Física. Instituto de Física del Sur; Argentina
dc.journal.title
Limnology and Oceanography
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://aslopubs.onlinelibrary.wiley.com/doi/abs/10.4319/lo.2001.46.6.1455
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.4319/lo.2001.46.6.1455
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