Total organic carbon fluxes of the Red River system (Vietnam)

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 solid...

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Published in:Earth surface processes and landforms Vol. 42; no. 9; pp. 1329 - 1341
Main Authors: Le, Thi Phuong Quynh, Dao, Viet Nga, Rochelle‐Newall, Emma, Garnier, Josette, Lu, XiXi, Billen, Gilles, Duong, Thi Thuy, Ho, Cuong Tu, Etcheber, Henri, Nguyen, Thi Mai Huong, Nguyen, Thi Bich Ngoc, Nguyen, Bich Thuy, Da Le, Nhu, Pham, Quoc Long
Format: Journal Article
Language:English
Published: Bognor Regis Wiley Subscription Services, Inc 01.07.2017
Subjects:
Carbon
Carbon cycle
Climate
Climate and population
Climate change
Dissolved organic carbon
Ecosystems
Erosion
Estuaries
Estuarine dynamics
Estuarine environments
Fluctuations
Fluvial sediments
Fluxes
human impacts
Impoundments
Land use
Leaching
Loads (forces)
Marine ecosystems
Nitrogen
Oceans
Organic carbon
Particulate organic carbon
Phosphorus
Rainy season
Red River
River discharge
River flow
River water
Rivers
Sediment
Sediment load
Soil
Soil erosion
Stations
Suspended particulate matter
Terrestrial ecosystems
Total organic carbon
Total suspended solids
Water column
Water discharge
Red River
Southeast Asia
Vietnam
ISSN:0197-9337, 1096-9837
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Summary: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 × 1013 ± 4.0 × 1013 MgC.yr−1 (range 27.9–35.8 × 1013 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. Copyright © 2017 John Wiley & Sons, Ltd.
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ISSN:0197-9337
1096-9837
DOI:10.1002/esp.4107