Artículo
Historical records of mercury in southern latitudes over 1600 years: Lake Futalaufquen, Northern Patagonia
Daga, Romina Betiana
; Ribeiro, Sergio; Pavlin, Majda; Rizzo, Andrea Paula
; Lojen, Sonja; Vreca, Polona; Horvat, Milena; Arribere, Maria Angelica
Fecha de publicación:
05/2016
Editorial:
Elsevier Science
Revista:
Science of the Total Environment
ISSN:
0048-9697
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Mercury is released to the environment from natural and anthropogenic sources, and through atmospheric transport is distributed globally. Lake Futalaufquen (42.8°S) is an oligotrophic lake located in Los Alerces National Park (Northern Patagonia), providing a remote and unpolluted study system. A lacustrine sedimentary sequence revealed 1600 years of Hg deposition, identifying natural baselines and marked peaks not correlated with long-range atmospheric transport. Organic matter and catchment erosion were discarded as Hg drivers. Natural background, pre-1300 CE Hg concentrations, ranged between 27 and 47 ng g-1 (accumulation rates from 8 to 15 μg m-2 y-1). From 1300 CE on, the Hg background profile did not follow the generally increasing Hg pattern observed in both Southern and Northern Hemisphere since pre-industrial times. It was not until the last century that a 1.6-fold increase is observed in the Hg accumulation rate, considered among the lowest increments in southern South America. Noteworthy local/regional sources of Hg for this area, along with global transport, are forest fires and volcanic activity. Between approx. 1340 and 1510 CE, sharp increase in Hg concentration and accumulation rate (up to 204 ng g-1 and 51 μg m-2 y-1, respectively) were clearly associated with extended fire episodes. Furthermore, high Hg peaks during the last 300 years were associated with volcanic eruptions in northernmost Patagonia together with fairly irregular fire episodes, caused by anthropogenic burning by settling population in the Andes.
Palabras clave:
Argentina
,
Atmospheric Deposition
,
Fires
,
Global Pollutant
,
Lakes
,
Volcanism
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Daga, Romina Betiana; Ribeiro, Sergio; Pavlin, Majda; Rizzo, Andrea Paula; Lojen, Sonja; et al.; Historical records of mercury in southern latitudes over 1600 years: Lake Futalaufquen, Northern Patagonia; Elsevier Science; Science of the Total Environment; 553; 5-2016; 541-550
Compartir
Altmétricas