Long-Term (similar to 57 ka) Controls on Mercury Accumulation in the Souther Hemisphere Reconstructed Using a Peat Record from Pinheiro Mire (Minas Gerais, Brazil)

Autor(es)

Perez-Rodriguez, Marta ^[1] ; Horak-Terra, Ingrid ^[2] ; Rodriguez-Lado, Luis ^[1] ; Aboal, Jesus R. ^[3] ; Martinez Cortizas, Antonio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Santiago de Compostela, Fac Biol, Dept Edafol & Quim Agr, Santiago De Compostela 15782 - Spain

^[2] Univ Sao Paulo, ESALQ, Dept Ciencia Solo, BR-13418900 Piracicaba, SP - Brazil

^[3] Univ Santiago de Compostela, Fac Biol, Santiago De Compostela 15782 - Spain

• Tipo de documento: Artigo Científico
• Fonte: Environmental Science & Technology; v. 49, n. 3, p. 1356-1364, FEB 3 2015.
• Citações Web of Science: 8

Resumo

Natural archives have been used to reconstruct mercury atmospheric deposition at different spatial and temporal scales during the Holocene in the Northern Hemisphere. In this study, we present the results from a Brazilian mountain mire (Pinheiro mire, Minas Gerais, SE Brazil), extending back to similar to 57 ka. The core was analyzed for mercury concentration, organic matter content, organic carbon isotopic composition, and tracers of mineral matter flux. Principal components analysis followed by principal components regression enabled us to determine the evolution of the weight of the latent processes governing the accumulation of mercury through time. We show that climate change was the main driver for the variations of mercury concentrations, either indirectly by (i) enhancing soil erosion in the mire's catchment, which led to a decrease in mercury concentration due to dilution by low mercury-containing mineral matter, (ii) increasing regional dust deposition, which resulted in increased concentrations, or directly, by long-term changes in atmospheric wet deposition (arid vs humid periods). Internal peat processes (i.e., decomposition and mass loss) had a minor influence at the time scale represented by the core. (AU)

• Processo FAPESP: 10/51637-0 - Reconstrução paleoambiental da Serra do Espinhaço Meridional durante o quartenário baseado nos registros polínicos, geoquímicos e isotópicos em organossolos
• Beneficiário: Ingrid Horák Terra
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 12/00676-1 - Evidências geoquímicas das mudanças ambientais durante o quaternário na Serra do Espinhaço meridional, Minas Gerais
• Beneficiário: Ingrid Horák Terra
• Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado