370
K. M. G. Mostofa et al.
sources of CDOM are 10–150 times higher than those of marine CDOM, whilst
coastal waters that receive riverine inputs typically possess higher CDOM absorption coefficients than open ocean waters (Arrigo and Brown 1996; Vähätalo
and Wetzel 2004; Carder et al. 1989; del Vecchio and Blough 2004; del Vecchio
Fig. 1 Absorption spectra of
upstream CDOM (a, b NishiMattaya and Higashi-Mataya,
Lake Biwa watershed, Japan),
and downstream CDOM
(c Yasu River, Lake Biwa
watershed, Japan). Data
source Mostofa KMG et al.
(unpublished data)
-0.01
0.00
0.01
0.02
0.03
0.04
0.05
0.06
(a)
(b)
(c)
250 300 350 400 450 500 550 600 650 700
River waters (before irradiation)
Irradiated river waters (after 1 day)
Irradiated river waters (after 10 days)
Irradiated river waters (after 13 days)
Dark incubated river waters (after 13 days)
-0.005
0
0.005
0.01
0.015
0.02
0.025
250 300 350 400 450 500 550 600 650 700
0.00
0.01
0.02
0.03
0.04
0.05
0.06
250 300 350 400 450 500 550 600 650 700