Data/hora: 16/06/2024 18:34:12

Biblioteca(s): 	Embrapa Amazônia Oriental; Embrapa Meio Ambiente.	
Data corrente: 	30/09/2011	
Data da última atualização: 	04/10/2011	
Autoria: 	SOUSA, E. dos S.; SALIMON, C. I.; FIGUEIREDO, R. de O.; KRUSCHE, A. V.	
Afiliação: 	Eliete dos Santos Sousa, UFPA; Cleber Ibraim Salimon, UFAC; RICARDO DE OLIVEIRA FIGUEIREDO, CNPMA; Alex Vladimir Krusche, CENA/USP.	
Título: 	Dissolved carbon in an urban area of a river in the Brazilian Amazon.	
Ano de publicação: 	2011	
Fonte/Imprenta: 	Biogeochemistry, Dordrecht, v. 105, p. 159-170, 2011.	
Idioma: 	Inglês	
Conteúdo: 	The main objective of this study was to evaluate dissolved organic and inorganic carbon dynamics along upstream and downstream reaches of the Acre River draining the city of Rio Branco, in the state of Acre, Brazil. Dissolved organic carbon (DOC) concentrations in the Acre River were significantly higher during the wet season, ranging from 385 ± 160 to 430 ± 131 IJM among the stations, with no difference in upstream and downstream concentrations. Dissolved inorganic carbon (DIC) showed an inverse pattern, with higher concentrations in the dry season, ranging from 816 ± 215 to 998 ± 754 IJM among the stations, as well as no difference in upstream and downstream DIC concentrations. Bicarbonate was the dorninant DIC fraction and was mainly observed during the dry season. Due to lower pH values during the wet season, CO2 partial pressure (PC02) in the Acre Ri ver was higher in the wet season, with values ranging from 4,567 ± 1,813 to 4,893 ± 837 ppm among the stations. Our results indicate that, although the Acre River drains a large city with significant sewage disposal into the river, seasonal hydrological processes are the main driver of dissolved carbon dynarnics, even in the downstream study reach directly influenced by urbanization.	
Palavras-Chave: 	Acre River; Amazon; Carbono dissolvido; Dissolved carbon; Seasonal variations; Urban impacts; Variações sazonais.	
Thesagro: 	Carbono; Qualidade da água; Rio.	
Thesaurus Nal: 	Dissolved organic carbon; Rivers; Seasonal variation.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Meio Ambiente (CNPMA)	
Exemplares: 	CNPMA - (10541-1) - UPC - AP - DD -  -  -  - DIS
CPATU - (44795-1) - UPC - AP - DD -  -  -  - DIS