| Abstract: | We present a model that considers UV-absorbing dissolved organic matter (DOM) to consist of two components (A and B), each with a distinct and constant spectrum. Component A absorbs UV light strongly, and is therefore presumed to possess aromatic chromophores and hydrophobic character, whereas B absorbs weakly and can be assumed hydrophilic. We parameterised the model with dissolved organic carbon concentrations [DOC] and corresponding UV spectra for c. 1700 filtered surface water samples from North America and the United Kingdom, by optimising extinction coefficients for A and B, together with a small constant concentration of non-absorbing DOM (0.80 mg DOC L-1). Good unbiased predictions of [DOC] from absorbance data at 270 and 350 nm were obtained (r2 = 0.98), the sum of squared residuals in [DOC] being reduced by 66% compared to a regression model fitted to absorbance at 270 nm alone. The parameterised model can use measured optical absorbance values at any pair of suitable wavelengths to calculate both [DOC] and the relative amounts of A and B in a water sample, i.e. measures of quantity and quality. Blind prediction of [DOC] was satisfactory for 9 of 11 independent data sets (181 of 213 individual samples). |
| Genre: | Article |
| ProdID: | 70038620 |
| Citation Author: | Carter, Heather T.; Tipping, Edward ; Koprivnjak, Jean-Francois ; Miller, Matthew P.; Cookson, Brenda ; Hamilton-Taylor, John |
| Citation Contributing Office: | Utah Water Science Center |
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| Citation End Page: | 4542 |
| Citation Issue: | 14 |
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| Citation Language: | English |
| Citation Larger Work Title: | Water Research |
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| Citation Phsyical Description: | 11 p. |
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| Citation Publisher: | Elsevier |
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| Citation Search Results Text: | Freshwater DOM quantity and quality from a two-component model of UV absorbance; 2012; Article; Journal; Water Research; Carter, Heather T.; Tipping, Edward ; Koprivnjak, Jean-Francois ; Miller, Matthew P.; Cookson, Brenda ; Hamilton-Taylor, John |
| Citation Start Page: | 4532 |
| Citation Volume: | 46 |
| Citation Year: | 2012 |
| Type: | citation/reference |
| Text: | Freshwater DOM quantity and quality from a two-component model of UV absorbance; 2012; Article; Journal; Water Research; Carter, Heather T.; Tipping, Edward ; Koprivnjak, Jean-Francois ; Miller, Matthew P.; Cookson, Brenda ; Hamilton-Taylor, John |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/j.watres.2012.05.021 |
| Date Other: | Fri, 27 Jul 2012 00:00 -0500 |
| Publisher: | Elsevier |
