Presentation - National Water Research Institute
Presentation - National Water Research Institute
Presentation - National Water Research Institute
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DOC (ppm C)<br />
Absorbance coefficient -<br />
measure of how much CDOM is<br />
present or how photoactive it is<br />
› abs decreases as the CDOM is<br />
diluted or photochemically<br />
bleached on exposure to sunlight<br />
Higher abs and dissolved organic<br />
matter content (as DOC) for<br />
source waters vs. surf zone.<br />
Linear relationship for DOC vs.<br />
abs for all bulk/size-fractionated<br />
samples suggests dilution<br />
dominates variability in abs, with<br />
minor aging/bleaching effects.<br />
No significant change in linear<br />
relationship for DOC vs. abs<br />
observed for permeate/<br />
concentrate for source/surf zone<br />
waters - even distribution of<br />
optically active DOM across size<br />
range<br />
3.0<br />
2.5<br />
2.0<br />
1.5<br />
1.0<br />
0.5<br />
0.0<br />
0 2 4 6 8 10 12<br />
Absorbance coefficient (m -1 )<br />
Clark et al., Chemosphere, 2009
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