δ13C tracing of dissolved inorganic carbon sources in Patagonian rivers (Argentina)

@article{citeulike:1897330, abstract = {The main Patagonian rivers (Colorado, Negro, Chubut, Deseado, Coyle, Chico, Santa Cruz and Gallegos) were sampled between September 1995 and November 1998 to determine their chemical and isotopic compositions, the origins of the suspended and dissolved river loads and their inputs to the South Atlantic Ocean. This paper focuses on the dissolved inorganic carbon (DIC) transport and its ?13C isotopic signature. The ?13CDIC values vary between -12·8 and -1·8? and allow one to distinguish two river groups: (i) the Colorado, Negro, Chubut and Santa Cruz, which display the highest values and the lowest seasonal variations; (ii) the Deseado, Coyle, Chico and Gallegos, which show the lowest values and the highest seasonal variations. For the first group, ?13CDIC is mainly controlled by important exchanges between the river waters and atmospheric CO2, due to the presence of lakes and dams. For the second group, ?13CDIC also appears to be controlled by the oxidation of organic carbon, showing a negative relationship between ?13CDIC and the dissolved organic carbon. These biogeochemical processes interfere with the contribution of carbonate and silicate weathering to the riverine DIC and do not allow use of ?13CDIC alone to distinguish these contributions.The annual DIC flux exported by Patagonian Rivers to the South Atlantic Ocean averages 621 × 109 g. of C, i.e. a specific yield of 2·7 g m-2 year-1. The mean ?13CDIC can be estimated to - 4·9?, which is high compared with other rivers of the world.}, address = {Laboratoire des M\'{e}canismes de Transfert en G\'{e}ologie (LMTG), UMR no. 5563 CNRS-IRD-Universit\'{e} Paul Sabatier, 14 avenue Edouard Belin, Toulouse 31400, France; Centro de Investigaciones Geoqu\'{i}micas y de Procesos de la Superficie (CIGeS), FCEFyN, Universidad Nacional de C\'{o}rdoba, Avenida V\'{e}lez Sarsfield 1611, X5016GCA C\'{o}rdoba, Argentina; Centre de G\'{e}ochimie de la Surface (CGS), UMR no. 7517 CNRS-Universit\'{e} Louis Pasteur, 1 rue Blessig, 67084 Strasbourg Cedex, France}, author = {Brunet, F. and Gaiero, D. and Probst, J. L. and Depetris, P. J. and Lafaye, Gauthier F. and Stille, P. }, citeulike-article-id = {1897330}, doi = {http://dx.doi.org/10.1002/hyp.5973}, journal = {Hydrological Processes}, keywords = {13c, carbon, dic, dic13, doc, patagonia, reservoirs, rivers, south\_america, strontium, temperate, weathering}, number = {17}, pages = {3321--3344}, posted-at = {2007-11-11 04:21:07}, priority = {0}, title = {δ13C tracing of dissolved inorganic carbon sources in Patagonian rivers (Argentina)}, url = {http://dx.doi.org/10.1002/hyp.5973}, volume = {19}, year = {2005} }

TY - JOUR ID - citeulike:1897330 L3 - citeulike-article-id:1897330 TI - δ13C tracing of dissolved inorganic carbon sources in Patagonian rivers (Argentina) JF - Hydrological Processes VL - 19 IS - 17 SP - 3321 EP - 3344 AD - Laboratoire des Mécanismes de Transfert en Géologie (LMTG), UMR no. 5563 CNRS-IRD-Université Paul Sabatier, 14 avenue Edouard Belin, Toulouse 31400, France; Centro de Investigaciones Geoquímicas y de Procesos de la Superficie (CIGeS), FCEFyN, Universidad Nacional de Córdoba, Avenida Vélez Sarsfield 1611, X5016GCA Córdoba, Argentina; Centre de Géochimie de la Surface (CGS), UMR no. 7517 CNRS-Université Louis Pasteur, 1 rue Blessig, 67084 Strasbourg Cedex, France N2 - The main Patagonian rivers (Colorado, Negro, Chubut, Deseado, Coyle, Chico, Santa Cruz and Gallegos) were sampled between September 1995 and November 1998 to determine their chemical and isotopic compositions, the origins of the suspended and dissolved river loads and their inputs to the South Atlantic Ocean. This paper focuses on the dissolved inorganic carbon (DIC) transport and its ?13C isotopic signature. The ?13CDIC values vary between -12·8 and -1·8? and allow one to distinguish two river groups: (i) the Colorado, Negro, Chubut and Santa Cruz, which display the highest values and the lowest seasonal variations; (ii) the Deseado, Coyle, Chico and Gallegos, which show the lowest values and the highest seasonal variations. For the first group, ?13CDIC is mainly controlled by important exchanges between the river waters and atmospheric CO2, due to the presence of lakes and dams. For the second group, ?13CDIC also appears to be controlled by the oxidation of organic carbon, showing a negative relationship between ?13CDIC and the dissolved organic carbon. These biogeochemical processes interfere with the contribution of carbonate and silicate weathering to the riverine DIC and do not allow use of ?13CDIC alone to distinguish these contributions.The annual DIC flux exported by Patagonian Rivers to the South Atlantic Ocean averages 621 × 109 g. of C, i.e. a specific yield of 2·7 g m-2 year-1. The mean ?13CDIC can be estimated to - 4·9?, which is high compared with other rivers of the world. KW - 13c KW - carbon KW - dic KW - dic13 KW - doc KW - patagonia KW - reservoirs KW - rivers KW - south_america KW - strontium KW - temperate KW - weathering AU - Brunet, F AU - Gaiero, D AU - Probst, JL AU - Depetris, PJ AU - Lafaye, Gauthier AU - Stille, P PY - 2005/// UR - http://dx.doi.org/10.1002/hyp.5973 ER -