Precipitation origin and evaporation of lakes in semi-arid Patagonia (Argentina) inferred from stable isotopes (δ18O, δ2H)

Influence of Methanogenic Populations in Holocene Lacustrine Sediments Revealed by Clone Libraries and Fatty Acid Biogeochemistry

“…Presently, the lake is polymictic due to the persistent overturn caused by the Westerlies (average wind speed: 7.4 m/s) with subsaline conditions and water temperatures ranging from 4°C to 10°C throughout the year. Oxic conditions prevail in the water column (Zolitschka et al 2006;Mayr et al 2007). However, reducing conditions at the water/sediment interface have occurred over time (Haberzettl et al 2007) and the oxygen penetration within surface sediment appears to be restricted (Vuillemin et al 2013).…”

Direct Measurements and New Mathematical Methods to Estimate the Pond Evaporation of the French Midwest

“…O and 2 H provide independent hydrological information that may be useful for estimating evaporation and other water balance parameters, as it was demonstrated in previous studies of water bodies (Gat, 1970;Gibson et al, 1993;Mayr et al, 2007;Mügler et al, 2008). In a nutshell, the theory of the isotopic method is based on a mass of evaporated water enriches in its composition in stable isotopes, and the remaining water becomes relatively richer in oxygen 18 and in deuterium.…”

“…One of the weak points of this method is the expense because it requires continuous samples of the water from pond at several depths, from the incoming and outgoing streams, precipitation and air humidity. In addition, large inter-site and inter-annual isotope variations are observed for shallow lakes, while, deep lakes have similar isotope values and small inter-annual variations (Mayr et al, 2007). For these reasons, this method remains an alternative to estimate the evaporation of the ponds but it is not the preferred method to carry out this kind of studies especially for ponds.…”

Corredores Naturales, Fuente De Obsidiana Y Estacionalidad: El Caso De La Circulación Humana Entre Pali Aike Y Sierra Baguales (Patagonia Meridional)

“…En una escala temporal más breve, episodios de sequía, deshielo, desborde de ríos, caída de nieve o congelamiento de suelos y ríos (Mayr et al 2007;Paruelo et al1998;Peláez y Jiménez 2006;Solari et al 2012; Sturzenbaum y Borrelli 2001) debieron imponer procesos de obstrucción o fragmentación del hábitat, introduciendo cambios en los costos de uso y la oferta de los espacios transitables. Estas condiciones debieron ser el trasfondo de procesos humanos que involucraran estimaciones de costo/ beneficio, riesgo e incertidumbre, formas de acceso estacional, o bien reformulación de los circuitos de movilidad (p.ej., Avery 1995;Pafundi 2006;Pallo 2012;Veth 1993).…”