NDLI: Mixing Behavior of Colored Dissolved Organic Matter and Its Potential Ecological Implication in the Caloosahatchee River Estuary, Florida

Content Provider	Springer Nature Link
Author	Chen, Zhiqiang Doering, Peter H. Ashton, Mayra Orlando, Beth A.
Copyright Year	2014
Abstract	Colored dissolved organic matter (CDOM) is one of the most important water quality constituents impacting light attenuation in estuaries; its concentration and distribution influence light quality and quantity available to phytoplankton and submerged aquatic vegetation. By combining field surveys (March 2009–January 2011) and laboratory studies, we examined the estuarine mixing behavior of CDOM and potential loss processes affecting mixing behavior in the Caloosahatchee River Estuary (CRE), Florida. The CDOM absorption coefficient at 355 nm (a $_{CDOM}$(355), m$^{−1}$) varied from 0.5 to 64 m$^{−1}$, with higher values in the upper estuary and lower values downstream, and increased with increasing freshwater inflow. CDOM exhibited three apparent mixing patterns with respect to hypothetical conservative mixing, with (1) conservative behavior or (2) addition at lower inflow and (3) loss at higher inflow. Laboratory studies indicated that flocculation was not a major loss process and that CDOM was susceptible to photolysis. The concentration of CDOM declined as a function of cumulative solar irradiation with a rate of ∼0.003 m$^{2}$ mol$^{−1}$, suggesting a photobleaching half-life for CDOM of about 1 w. Apparent nonconservative mixing of CDOM increased or decreased light attenuation by 15–30 %, depending on freshwater inflow and location in the estuary. Light attenuation in the CRE was controlled primarily by CDOM in the upper estuary and by turbidity in the lower estuary, with the average contribution of CDOM to total light attenuation of 55 % (2–92 %) and turbidity of 23 % (3–79 %). The contribution of chlorophyll a (Chl a) to light attenuation was less than both CDOM and turbidity, accounting for about 12 % on average (2–24 %), regardless of location. These results suggest that any nutrient management scenario aimed at improving water clarity through reduction in Chl a concentration should consider the contributions of color and turbidity as well.
Starting Page	1706
Ending Page	1718
Page Count	13
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	38
Issue Number	5
e-ISSN	15592731
Language	English
Publisher	Springer US
Publisher Date	2014-12-02
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Colored dissolved organic matter Mixing behavior Photolysis Light attenuation Caloosahatchee River Estuary Environment Ecology Freshwater & Marine Ecology Environmental Management Coastal Sciences Water and Health
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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