INVESTIGADORES
GEREA Marina
artículos
Título:
Interplay between climate and hydrogeomorphic features and their effect on the seasonal variation of dissolved organic matter in shallow temperate lakes of the Southern Andes (Patagonia, Argentina): a field study based on optical properties
Autor/es:
SOTO CÁRDENAS, CAROLINA; GEREA, MARINA; GARCÍA, PATRICIA; PÉREZ, GONZALO LUIS; DIÉGUEZ, MARÍA DEL CARMEN; RAPACIOLI, RAÚL; REISSIG, MARIANA; QUEIMALIÑOS, CLAUDIA
Revista:
ECOHYDROLOGY
Editorial:
JOHN WILEY & SONS INC
Referencias:
Lugar: New York; Año: 2017
ISSN:
1936-0584
Resumen:
This study analyzes the effects of the interplay between climate seasonality and hydrogeomorphic (HGM) lake features on dissolved organic matter (DOM) properties in two neighboring shallow lakes of Andean Patagonia with different connectivity. The survey was conducted over three years at the end of the wet and dry seasons, assessing the seasonal and inter-annual variation of dissolved organic carbon (DOC) concentration, whole-lake DOC mass, and DOM quality, through chromophoric and fluorescent DOM properties (CDOM and FDOM, respectively). During the wet season (fall-winter), precipitation and runoff increased water discharge, water level and inputs of terrestrial DOM with high aromaticity, humic content and high molecular weight in both lakes. Contrastingly, during the dry season (spring-summer), in which photodegradation promoted by high irradiance and stagnant conditions drove DOM transformation, non-humic, low molecular weight DOM prevailed. Both lakes displayed synchronicity in their DOC mass, CDOM and FDOM properties, indicative of similar responses to climate forcing, although the overall impact was modulated by their HGM features. Conversely, DOC concentration showed asynchronous responses between lakes, due to the higher intensity of the dilution/evapoconcentration processes in the connected lake, highlighting that DOC concentration is not always sensitive to climate-driven forces. Overall, this study emphasizes the importance of variables other than DOC concentration, like whole-lake DOC mass, DOM quality, and HGM features, to better understand the effect of climate variability on DOM dynamics. Our results allow inferring the potential impact of an environmental scenario characterized by lower precipitation and sustained warming on DOM dynamics in Northern Andean Patagonia
rds']