Thi Phuong Quynh Le, Viet Nga Dao, Rochelle Newall Emma, Garnier J., XiXi Lu, Billen G., Thi Thuy Duong, Cuong Tu Ho, Etcheber H., Thi Mai Huong Nguyen, Thi Bich Ngoc Nguyen, Bich Thuy Nguyen, Nhu Da Le, Quoc Long Pham. (2017). Total organic carbon fluxes of the Red River system (Vietnam). Earth Surface Processes and Landforms, 42 (9), p. 1329-1341. ISSN 0197-9337.
Titre du document
Total organic carbon fluxes of the Red River system (Vietnam)
Année de publication
2017
Auteurs
Thi Phuong Quynh Le, Viet Nga Dao, Rochelle Newall Emma, Garnier J., XiXi Lu, Billen G., Thi Thuy Duong, Cuong Tu Ho, Etcheber H., Thi Mai Huong Nguyen, Thi Bich Ngoc Nguyen, Bich Thuy Nguyen, Nhu Da Le, Quoc Long Pham
Source
Earth Surface Processes and Landforms, 2017,
42 (9), p. 1329-1341 ISSN 0197-9337
Riverine transport of organic carbon from terrestrial ecosystems to the oceans plays an important role in the global carbon cycle. The Red River is located in Southeast Asia where river discharge, sediment loads and fluxes of elements (carbon, nitrogen and phosphorus) associated with suspended solids have been dramatically altered over past decades as a result of reservoir impoundment and land use, population, and climate change. Dissolved organic carbon (DOC) and particulate organic carbon (POC) concentrations were measured monthly at four stations of the Red River system from January 2008 to December 2010. The results reveal that POC changed synchronically with total suspended solids (TSS) concentration and with the river discharge, whereas no clear trend was observed for DOC concentration. The mean value of total organic carbon (TOC = DOC + POC) flux in the delta of the Red River was 31.5 x 10(13) +/- 4.0 x 10(13) MgC.yr (1) (range 27.9-35.8 x 10(13) MgC.yr (1) which leads to a specific TOC flux of 2012 +/- 255 kgC.km(-2).yr(-1) during this 2008-2010 period. About 80% of the TOC flux was transferred to the estuary during the rainy season as a consequence of the higher river water discharge. The high mean value of the POC:Chl-a ratio (1585 +/- 870 mgC.mgChl-a(-1)) and the moderate C:N ratio (7.3 +/- 0.1) in the water column system suggest that organic carbon in the Red River system is mainly derived from erosion and soil leaching in the basin. The effect of two new dam impoundments in the Red River was also observable with lower TOC fluxes in 2010 compared with 2008.
Plan de classement
Sciences du milieu [021]
;
Hydrologie [062]
;
Géologie et formations superficielles [064]
Description Géographique
VIET NAM ; FLEUVE ROUGE BASSIN
Localisation
Fonds IRD [F B010070328]
Identifiant IRD
fdi:010070328
