Publication Detail

Seasonal changes in dissolved organic matter outwelling in an urban salt marsh system

H. S. Cato, Robert Chen, X. Wang, Bernie Gardner, Francesco Peri
1 pp.
MITSG 13-42
$5.50 DOM / $7.50 INT

Macrophyte-dominated communities such as seagrass beds, mangroves and salt marshes have long been accepted as sources of large biodiversity, but are currently unaccounted for in global carbon budgets. Outwelling of dissolved organic carbon (DOC) from salt marshes has been hypothesized as highly productive marsh grasses are periodically inundated with seawater. Seasonal fluctuations of this vegetative flux have been observed, and this study investigates the variation of these fluxes from an urban salt marsh into the Neponset River Estuary through the "Fall Dump" period (August through December) as marsh grasses go senescent for the winter. Chromophoric dissolved organic matter (CDOM) and DOC were measured on monthly estuarine transects, continuously by mid-creek buoys, during week-long incubations of salt marsh below-ground and above-ground vegetatin, and in samples of seepage into secondary marsh creeks. CDOM and DOC outwelling reached a maximum in the late Fall, and was reduced to nearly zero in the winter months.

type: Presentations

Parent Project

Project No.: 2010-R/RT-2/RC-117
Title: Consortium for Ocean Sensing In the Nearshore Environment (COSINE)