|  |
Program |
 |
| |
 |
General Session 2: Marine & estuarine biogeochemistry |
| |
|
|
Carbon transport from Yellow River to sea affected by reservoir regulation
GS2-53
Hong Yang* , Wuhan University, China; University of Oslo, Norway
Junqiang Xia, Wuhan University, China
Julian R thompson, University College London, UK
Presenter Email: hongyanghy@gmail.com
|
| Rivers play an important role in the global carbon cycle by linking ocean and terrestrial ecosystem. We examined the transport features of carbon in Yellow River to estuary, with a focus on the reservoir construction and regulation scheme, particularly Xiaolangdi Reservoir. The hydrological record, soil erosion and sediment load, and carbon content were compiled to estimate of the soil eroded and carbon induced by water in the Yellow River. Particulate organic carbon (POC) is originated mainly from the Loess Plateau, while dissolved organic carbon (DOC) varied due to human activities including agricultural activities and wastewater discharge from the catchment. Approximately half OC was buried behind dams, indicating the importance of dams for carbon sequestration. POC deposited in reservoirs achieved around 3 million tonnes per year, more than 5 times of the annual POC flux discharged to the ocean. The water and sediment regulation (WSR) scheme has imposed a big disturbance on carbon transport to Bo Sea. During the WSR period in Xiaolangdi Reservoir, large proportions of the annual DOC (35 %) and POC (56 %) fluxes were transported to Bo Sea. The decrease of sediment discharge to the sea not only can change the sediment dispersal pattern at the river mouth, but also can modify the shoreline and subaqueous slope. WSR influences river carbon cycle and the transport of carbon to estuarine and coast.
|
|
|
|
|