000223100 001__ 223100
000223100 005__ 20181203024437.0
000223100 0247_ $$2doi$$a10.1002/2015Gb005271
000223100 022__ $$a0886-6236
000223100 02470 $$2ISI$$a000382582400008
000223100 037__ $$aARTICLE
000223100 245__ $$aCarbon fate in a large temperate human-impacted river system: Focus on benthic dynamics
000223100 260__ $$aWashington$$bAmerican Geophysical Union$$c2016
000223100 269__ $$a2016
000223100 300__ $$a19
000223100 336__ $$aJournal Articles
000223100 520__ $$aFluvial networks play an important role in regional and global carbon (C) budgets. The Seine River, from the Paris urban area to the entrance of its estuary (220km), is studied here as an example of a large human-impacted river system subject to temperate climatic conditions. We assess organic C (OC) budgets upstream and downstream from one of the world's largest wastewater treatment plants and for different hydrological conditions using a hydrobiogeochemical model. The fine representation of sediment accumulation on the river bed allows for the quantification of pelagic and benthic effects on OC export toward the estuary and on river metabolism (i.e., net CO2 production). OC export is significantly affected by benthic dynamics during the driest periods, when 25% of the inputs to the system is transformed or stored in the sediment layer. Benthic processes also substantially affect river metabolism under any hydrological condition. On average, benthic respiration accounts for one third of the total river respiration along the studied stretch (0.27 out of 0.86g C m(-2) d(-1)). Even though the importance of benthic processes was already acknowledged by the scientific community for headwater streams, these results stress the major influence of benthic dynamics, and thus of physical processes such as sedimentation and resuspension, on C cycling in downstream river systems. It opens the door to new developments in the quantification of C emissions by global models, whereby biogeochemical processing and benthic dynamics should be taken into account.
000223100 6531_ $$acarbon
000223100 6531_ $$ariver export and metabolism
000223100 6531_ $$abenthic and pelagic dynamics
000223100 6531_ $$asediment-water exchanges
000223100 6531_ $$ahuman-impacted system
000223100 6531_ $$ahydrobiogeochemical modeling
000223100 700__ $$aVilmin, Lauriane$$uPSL Res Univ, Geosci Dept, MINES ParisTech, Fontainebleau, France
000223100 700__ $$aFlipo, Nicolas$$uPSL Res Univ, Geosci Dept, MINES ParisTech, Fontainebleau, France
000223100 700__ $$aEscoffier, Nicolas$$uUniv Paris Diderot, IPGP, Sorbonne Paris Cite, Paris, France
000223100 700__ $$aRocher, Vincent
000223100 700__ $$aGroleau, Alexis$$uUniv Paris Diderot, IPGP, Sorbonne Paris Cite, Paris, France
000223100 773__ $$j30$$k7$$q1086-1104$$tGlobal Biogeochemical Cycles
000223100 909C0 $$0252520$$pSBER$$xU13006
000223100 909CO $$ooai:infoscience.tind.io:223100$$particle$$pENAC
000223100 917Z8 $$x221818
000223100 937__ $$aEPFL-ARTICLE-223100
000223100 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000223100 980__ $$aARTICLE