Advances in Geosciences www.adv-geosci.net 1680-7340 1680-7359 22 4th EGU Alexander von Humboldt Conference "The Andes: Challenge for Geosciences" 2009 10.5194/adgeo-22-173-2009 http://www.adv-geosci.net/22/173/2009/ http://www.adv-geosci.net/22/173/2009/adgeo-22-173-2009.html http://www.adv-geosci.net/22/173/2009/adgeo-22-173-2009.pdf 173 179 2009-12-17 First insights on Lake General Carrera/Buenos Aires/Chelenko water balance G. Zambrano gzambran@udec.cl R. Abarca del Rio J.-F. Cretaux B. Reid Departamento de Geofísica (DGEO), Universidad de Concepción, Concepción, Chile LEGOS (UMR5566), Observatoire Midi-pyrénées, Toulouse, France Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Universidad Austral de Chile, Bilbao 449, Coyhaique, Chile Lago General Carrera (Chile) also called Lago Buenos Aires (Argentina) or originally Chelenko by the native habitants of the region is located in Patagonia on the Chilean-Argentinean border. It is the largest lake in Chile with a surface area of 1850 km². The lake is of glacial/tectonic origin and surrounded by the Andes mountain range. The lake drains primarily to the Pacific Ocean to the west, through the Baker River (one of Chile's largest rivers), and intermittently eastward to the Atlantic Ocean. We report ongoing results from an investigation of the seasonal hydrological cycle of the lake basin. The contribution by river input through snowmelt from the Andes is of primary importance, though the lack of water input by ungaged rivers is also critical. We present the main variables involved in the water balance of Lake General Carrera/Buenos Aires/Chelenko, such as influent and effluent river flows, precipitation, and evaporation, all this based mostly in in-situ information. Custodio, E., and Llamas, M.: Hidrogeolog\'ia Subterránea. Tomo I. Ediciones Omega, S. A. 2350~pp., 1983. Crétaux J.-F. and Birkett, C.: Lake studies from satellite altimetry, C. R. Geoscience, 338, 1098–1112, doi:10.1016/J.crte.2006.08.002, 2006. Fetter, C. W.: Applied Hydrogeology 4th ed., Prentice, 598~pp., 2001. Hartkamp, A. D., De Beurs, K., Stein, A., and White J. W.: Interpolation Techniques for Climate Variable, NRG-GIS Series 99-01, Mexico, D F., CIMMYT 1999. IGM – Instituto Geográfico Militar: Atlas geográfico de Chile: para la educación. 1998. Jobbágy E., Paruelo, J. and León, L.: Estimación del régimen de precipitación a partir de la distancia de la cordillera en el noroeste de la Patagonia, Ecolog\'ia Austral, 5, 47–53, 1995. Kalff, J.: Limnology, Prentice Hall, Upper Saddle River, New Jersey, USA, 2001. Kubota, T., Shige, S., Hashizume, H., Aonashi, K., Takahashi, N., Seto, S., Hirose, M., Takayabu, Y. N., Nakagawa, K., Iwanami, K., Ushio, T., Kachi, M., and Okamoto, K.: Global Precipitation Map using Satelliteborne Microwave Radiometers by the GSMaP Project: Production and Validation, IEEE T. Geosci. Remote, 45(7), 2259–2275, 2007. Lobos, E., Garc\'ia, E., and Peña, H.: Balance H\'idrico de Chile, Dirección general de Aguas, Ministerio de obras Públicas, Gobierno de Chile, 58~pp., 1987a. Lobos, E., Garc\'ia, E., and Peña, H.: Mapa Hidrogeológico de Chile, Dirección general de Aguas, Ministerio de obras Públicas, Gobierno de Chile, 8~pp., 1987b. López, P., Sirguey, P., Arnaud, Y., Pouyaud, B., and Chevallier, P.: Snow cover monitoring in the Northern Patagonia Icefield using MODIS satellite images (2000–2006), Global Planet. Change, 61, 103–116. 2008. Magnusen, J. J., Kratz, T. K., and Benson, B. J. (Eds.): Long-term Dynamics of Lakes in the Landscape, Oxford University Press, USA, 464~pp., 2006. Murdie, R. E., Pugh, D. T., and Styles, P.: A lightweight, portable, digital probe for measuring the thermal gradient in shallow water sediments, with examples from Patagonia, Geo-Mar. Lett., 18, 315–320, 1999. Paruelo, J., Beltrán, A., Jobbágy, E., Sala, O., and Golluscio, R.: The climate of Patagonia: general patterns and controls on biotic processes, Ecología Austral, 8, 85–101. 1969. Pellicciotti, F., Helbing, J., Rivera, A., Favier, V., Corripio, J., Araos, J., Sicart, J.-E., and Carenzo, M.: A study of energy balance and melt regime on Juncal Norte Glaciar, semi-arid Andes of central Chile using melt models of different complexity, Hydrol. Process., 22, 3980–3997, 2008. Rodwell, M. J. and Hoskins, B. J.: Subtropical Anticyclones and Summer Monsoons, J. Climate, 14, 3192–3211. 2001. Seluchi, M. and Marengo, J.: Tropical-Midlatitude Exchange of Air Masses During Summer and Winter in South America: Climatic Aspects and Examples of Intense Events, Int. J. Climatol., 20, 1167–1190, 2000. Townley, B.: L\'inea de Base del Medio F\'isico del Proyecto Hidroeléctrico Aysén. Cap\'itulo 2: Clima y Meteorolog\'ia, 75~pp., 2007. Walsh, K.: On the Influence of the Andes on the General Circulation of the Southern Hemisphere, J. Climate, 7, 1019–1025, 1994. Warren, C. R. and Sugden, D. E.: The Patagonian Icefields: A Glaciological Review, Arctic and Alpine Research, 25(4), 316–331, 1993. Winter, T. C.: Uncertainties in Estimating the Water Balance of Lakes, Water Resour. Bull., 17(1), 82–115, February 1981.