Geoscience Reference
In-Depth Information
(a)
7
6
5
4
3
2
1
0
1.8
1.5
1.2
(b)
0.9
0.6
0.3
0.0
100
(c)
80
60
40
20
0
(d)
1.8
1.7
1.6
PLFA
1.5
1.4
1.3
1.2
0.55
0.50
0.45
0.40
SRFA
(e)
0.35
0.30
0.25
13 May
22 June
01 Aug
Date
10 Sept
20 Oct
Figure 9.13. Seasonal variation in
(a)
chlorophyll a,
(b)
DOC,
(c)
percentage fulvic acid,
(d)
whole
water (solid line) and fulvic acid (dashed line) McKnight Fluorescence Index (FI), and
(e)
whole
water redox index (RI) at the outlet to Green Lake 4, an alpine lake in the Colorado Rocky Mountains.
The vertical dashed lines indicate the sustained rain event, and the shaded areas represent the tim-
ing of the peak in chlorophyll a at the outlet. PLFA represents the FI of the Pony Lake fulvic acid, a
microbial end member, and SRFA represents the FI of the Suwannee River fulvic acid, a terrestrial
end member. (Adapted from Miller et al.,
2009
.)
