Lake-level variations and tides in Lago Argentino, Patagonia: Insights from pressure tide gauge records

 

Autores
Richter, Andreas Jorg; Marderwald, Eric Rodolfo; Hormaechea, José Luis; Mendoza, Luciano Pedro Oscar; Perdomo, Raul Anibal; Connon, Gerardo Claudio; Scheinert, Mirko; Horwath, Martin; Dietrich, Reinhard
Tipo de recurso
artículo
Estado
Versión publicada
Año de publicación
2016
País
Argentina
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio
CONICET Digital (CONICET)
Descripción
Based on precise pressure tide gauge observations lake-level records are derived for two sites in Lago Argentino, southern Patagonia, of 2.5 and 1 years of duration. Applying the tools of time series analysis, the principal processes affecting the lake level are identified and quantified. Lake-level changes reflecting variations in lake volume are dominated by a seasonal cycle of 1.2 m in amplitude. Lakevolume changes occur in addition with a daily period in response to melt water influx from surrounding glaciers. Sporadic lake-volume jumps are caused by bursting of the ice dam of Perito Moreno glacier. Water movements in Lago Argentino are dominated by surface seiches reaching 20 cm in amplitude. Lake tides reach a maximum amplitude of 3 mm. The comparison of the tidal signal extracted from the lake-level observations with a model composed of the contributions of body tide and ocean tidal loading indicates a phase shift of 23° which is most likely explained by an 1 hour phase lag of global ocean tide models in the region of the highly fragmented Pacific coast. The comparison of the obtained results with those of a previous study of Lago Fagnano, Tierra del Fuego, allows to relate differences in the hydrological and hydrodynamic processes between both lakes to morphological properties. This leads to a tentative prediction of the lake-level variability to be expected from other great Patagonian lakes. The presented geodetic results shall serve as a starting point for a detailed limnological investigation of these aquatic ecosystems.
Idioma
inglés
OAI Identifier
oai:ri.conicet.gov.ar:11336/55097
Enlace del recurso
http://hdl.handle.net/11336/55097
Nivel de acceso
Acceso abierto
Materia
HYDRODYNAMICS
LAKE LEVEL
PATAGONIA
SURFACE SEICHES
TIDE GAUGE
Meteorología y Ciencias Atmosféricas
Ciencias de la Tierra y relacionadas con el Medio Ambiente
CIENCIAS NATURALES Y EXACTAS