Chromophoric dissolved organic matter export from U.S. rivers

Spencer, Robert, Aiken, George, Dornblaser, Mark, Butler, Kenna, Holmes, Robert, Fiske, Greg, Mann, Paul and Stubbins, Aron (2013) Chromophoric dissolved organic matter export from U.S. rivers. Geophysical Research Letters, 40 (8). pp. 1575-1579. ISSN 0094-8276

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Abstract

Chromophoric dissolved organic matter (CDOM) fluxes and yields from 15 major U.S. rivers draining an assortment of terrestrial biomes are presented. A robust relationship between CDOM and dissolved organic carbon (DOC) loads is established (e.g., a350 versus DOC; r2 = 0.96, p < 0.001). Calculated CDOM yields are also correlated to watershed percent wetland (e.g. a350; r2 = 0.81, p < 0.001) providing a method for the estimation of CDOM export from ungauged watersheds. A large variation in CDOM yields was found across the rivers. The two rivers in the north-eastern U.S. (Androscoggin and Penobscot), the Edisto draining into the South Atlantic Bight, and some rivers draining into the Gulf of Mexico (Atchafalaya and Mobile) exhibit the highest CDOM yields, linked to extensive wetlands in these watersheds. If the Edisto CDOM yield is representative of other rivers draining into the South Atlantic Bight, this would result in a CDOM load equivalent to that of the Mississippi from a region of approximately 10% of the Mississippi watershed, indicating the importance of certain regions with respect to the role of terrigenous CDOM in ocean color budgets.

Item Type:	Article
Uncontrolled Keywords:	chromophoric dissolved organic matter, U.S. Rivers, loads
Subjects:	F100 Chemistry F700 Ocean Sciences F800 Physical and Terrestrial Geographical and Environmental Sciences
Department:	Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User:	Paul Mann
Date Deposited:	29 Jul 2013 14:14
Last Modified:	13 Oct 2019 00:33
URI:	http://nrl.northumbria.ac.uk/id/eprint/13305

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