Aquatic Organic Matter Fluorescence
97
fluorescence EEMs has been correlated with DOC in rainwater, with higher DOC concentrations resulting in an increased fluorescence signal of rainwater (r = 0.699, p < 0.001),
for rainwater collected in southeastern North Carolina (USA), indicating that fluorescent
DOM is a common component of the DOC pool at that location (Kieber et al., 2006).
0.00
0.10
SQ1 Fmax (RU)
SQ2 Fmax (RU)
0.20
0.00
0.10
0.20
0.30
0.30
0.20
0.20
0.10
0.10
0.00
0.00
0
2
4
6
Sunlight Exposure Time (hr)
8
1 0
1 2
Trp Fmax (RU)
Try Fmax (RU)
4
3
2
1
0
Total Fluoresoence
(RU)
Light
Dark Control
Figure 3.10. A typical response for freshwater DOM (Island Lake at Toolik Lake LTER) during shortterm photochemical degradation highlighting a decrease in total fluorescence, a decrease in humiclike fluorophores (SQ1 and SQ2) and little change or a small increase in protein-like fluorophores
(Tyr and Trp). (Reproduced from Cory et al., 2007, with permission of American Geophysical Union
in the format Republish in book and “other” book via Copyright Clearance Center.)