caa a22 4500 467903190 CHVBK 20180406152825.0 cr unu---uuuuu 170328e20061101xx s 000 0 eng 10.1007/s10661-006-9188-7 doi (NATIONALLICENCE)springer-10.1007/s10661-006-9188-7 Natural and Anthropogenic Factors Controlling the Dissolved Organic Carbon Concentrations and Fluxes in a Large Tropical River, India [Elektronische Daten] [K. Balakrishna, Itta Kumar, G. Srinikethan, Gopal Mugeraya] Carbon studies in tropical rivers have gained significance since it was realized that a significant chunk of anthropogenic CO2 emitted into the atmosphere returns to the biosphere, that is eventually transported by the river and locked up in coastal sediments for a few thousand years. Carbon studies are also significant because dissolved organic carbon (DOC) is known to complex the toxic trace metals in the river and carry them in the dissolved form. For the first time, this work has made an attempt to study the variations in DOC concentrations in space and time for a period of 19 months, and estimate their fluxes in the largest peninsular Indian river, the Godavari at Rajahmundry. Anthropogenic influence on DOC concentrations possibly from the number of bathing ghats along the banks and domestic sewage discharge into the river are evident during the pre-monsoon of 2004 and 2005. The rise in DOC concentrations at the onset of monsoon could be due to the contributions from flood plains and soils from the river catchment. Spatial variations highlighted that the DOC concentrations in the river are affected more by the anthropogenic discharges in the downstream than in the upstream. The discharge weighted DOC concentrations in the Godavari river is 3-12 times lower than Ganga-Brahmaputra, Indus and major Chinese rivers. The total carbon fluxes from the Godavari into the Bay of Bengal is insignificant (0.5%) compared to the total carbon discharges by major rivers of the world into oceans. Springer Science+Business Media, Inc., 2006 anthropogenic nationallicence carbon flux nationallicence DOC nationallicence Godavari river nationallicence Rajahmundry nationallicence temporal and spatial variations nationallicence Balakrishna K. Department of Chemical Engineering, National Institute of Technology Karnataka, Surathkal, 575025, Mangalore, India aut Kumar Itta Department of Chemical Engineering, National Institute of Technology Karnataka, Surathkal, 575025, Mangalore, India aut Srinikethan G. Department of Chemical Engineering, National Institute of Technology Karnataka, Surathkal, 575025, Mangalore, India aut Mugeraya Gopal Department of Chemical Engineering, National Institute of Technology Karnataka, Surathkal, 575025, Mangalore, India aut Environmental Monitoring and Assessment Kluwer Academic Publishers 122/1-3(2006-11-01), 355-364 0167-6369 122:1-3<355 2006 122 10661 https://doi.org/10.1007/s10661-006-9188-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10661-006-9188-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Balakrishna K. Department of Chemical Engineering, National Institute of Technology Karnataka, Surathkal, 575025, Mangalore, India aut NATIONALLICENCE 700 1- Kumar Itta Department of Chemical Engineering, National Institute of Technology Karnataka, Surathkal, 575025, Mangalore, India aut NATIONALLICENCE 700 1- Srinikethan G. Department of Chemical Engineering, National Institute of Technology Karnataka, Surathkal, 575025, Mangalore, India aut NATIONALLICENCE 700 1- Mugeraya Gopal Department of Chemical Engineering, National Institute of Technology Karnataka, Surathkal, 575025, Mangalore, India aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Kluwer Academic Publishers 122/1-3(2006-11-01), 355-364 0167-6369 122:1-3<355 2006 122 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer