386
K. M. G. Mostofa et al.
both photoinduced and microbial assimilations during the summer stratification
period in surface waters (Zhang et al. 2009; Rochelle-Newall and Fisher 2002;
Yamashita and Tanoue 2004; Yamashita and Tanoue 2008; Mostofa et al. 2009;
Rochelle-Newall 1999; Mostofa et al. 2005; Parlanti et al. 2000). This material
does not show strong CDOM absorption. CDOM absorption is strongly dependent on the molecular nature of DOM (Lawrence 1980; Zepp and Schlotzhauer
1981; Hayase and Tsubota 1985; Ghassemi and Christman 1968; Thurman 1985;
Ma and Ali 2009), fulvic and humic acids depending on their sources and molecular weight are significantly different as far as radiation absorption is concerned.
4.2 Occurrence and Nature of Sediments
DOM composition depends significantly on the sources and nature of sediments,
such as vascular plant material and algal biomass in soil or sediment pore waters
(Zhang et al. 2009; Mostofa et al. 2009; Malcolm 1985; Zhao et al. 2009; Parlanti
et al. 2000; Fu et al. 2010; Li W et al. unpublished data). Vascular plant material of
terrestrial origin in waters or pore waters is mostly responsible for microbial production
Fig. 7 Relationship
between CDOM absorption
(a 355 , m −1 ) and DOC
concentrations in Chesapeake
Bay. Panel (a) shows DOC
and CDOM absorption for
all cruises, and in Panel (b)
DOC concentrations are
separated into conservative
and non-conservative groups.
Dashed line on Panel (a)
represents data of (Vodacek
et al. 1995). Data source
Rochelle-Newall and Fisher
(2002)
K. M. G. Mostofa et al.
both photoinduced and microbial assimilations during the summer stratification
period in surface waters (Zhang et al. 2009; Rochelle-Newall and Fisher 2002;
Yamashita and Tanoue 2004; Yamashita and Tanoue 2008; Mostofa et al. 2009;
Rochelle-Newall 1999; Mostofa et al. 2005; Parlanti et al. 2000). This material
does not show strong CDOM absorption. CDOM absorption is strongly dependent on the molecular nature of DOM (Lawrence 1980; Zepp and Schlotzhauer
1981; Hayase and Tsubota 1985; Ghassemi and Christman 1968; Thurman 1985;
Ma and Ali 2009), fulvic and humic acids depending on their sources and molecular weight are significantly different as far as radiation absorption is concerned.
4.2 Occurrence and Nature of Sediments
DOM composition depends significantly on the sources and nature of sediments,
such as vascular plant material and algal biomass in soil or sediment pore waters
(Zhang et al. 2009; Mostofa et al. 2009; Malcolm 1985; Zhao et al. 2009; Parlanti
et al. 2000; Fu et al. 2010; Li W et al. unpublished data). Vascular plant material of
terrestrial origin in waters or pore waters is mostly responsible for microbial production
Fig. 7 Relationship
between CDOM absorption
(a 355 , m −1 ) and DOC
concentrations in Chesapeake
Bay. Panel (a) shows DOC
and CDOM absorption for
all cruises, and in Panel (b)
DOC concentrations are
separated into conservative
and non-conservative groups.
Dashed line on Panel (a)
represents data of (Vodacek
et al. 1995). Data source
Rochelle-Newall and Fisher
(2002)