@Article{SilvaAlvaMaraFerr:2016:AnInPa,
               author = "Silva, Marcelo Gomes da and Alval{\'a}, Pl{\'{\i}}nio Carlos 
                         and Marani, Luciano and Ferreira, William Jos{\'e}",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "An{\'a}lise da influ{\^e}ncia de par{\^a}metros ambientais no 
                         fluxo de metano em {\'a}reas alag{\'a}veis e lagoas permanentes 
                         na regi{\~a}o do Rio Abobral, no Pantanal, Brasil",
              journal = "Revista Ambiente \& {\'A}gua",
                 year = "2016",
               volume = "11",
               number = "2",
                pages = "327--338",
             keywords = "Environmental chemistry, Environmental indicators, Environmental 
                         sciences, Global changes, ci{\^e}ncias ambientais, indicadores 
                         ambientais, mudan{\c{c}}as globais, qu{\'{\i}}mica ambiental.",
             abstract = "This study evaluates the influence of physical and chemical 
                         characteristics of the water column in the processes that result 
                         in methane emissions in the Pantanal. Two surveys were conducted 
                         in 2009 and 2010, corresponding to the drought and flood seasons, 
                         respectively. The CH4 fluxes were determined using the static 
                         chamber technique. Environmental variables, such as depth, water 
                         temperature, pH, redox potential, dissolved oxygen and total 
                         dissolved solids were also measured. Diffusive and bubble flux 
                         presented an average value of 11.1 ± 13.5 mg CH4 m-2 d-1 e 275.9 ± 
                         348.5 mg CH4 m-2 d-1, which is a value near those observed in 
                         other tropical flooded regions. Statistical t-tests have shown 
                         significant differences between drought and flood seasons (p 
                         \≤ 0.05). Diffusive fluxes represented about 87% of the 
                         total fluxes measured in drought. During the flood season there 
                         were more instances of bubble fluxes (77%). Statistical analysis 
                         (correlation and Principal Components Analysis) indicate that 
                         physical and chemical characteristics could affect methane fluxes. 
                         Diffusive fluxes correlated mainly withpH, redox potential and 
                         dissolved oxygen, which is in accordance withthe increase of 
                         organic matter during flooding. Bubble fluxes measured during the 
                         drought season correlated mainly withwater depthand temperature, 
                         pH and redox potential, which is an indication of an environment 
                         to suitable to the formation and liberation of the bubbles from 
                         sediment. © 2016, Institute for Environmental Research in 
                         Hydrographic Basins (IPABHi). RESUMO: Neste estudo foi analisada a 
                         influ{\^e}ncia de caracter{\'{\i}}sticas 
                         f{\'{\i}}sico-qu{\'{\i}}micas da coluna d{\'a}gua nos 
                         processos que resultam na emiss{\~a}o de metano no Pantanal. 
                         Foram realizadas duas campanhas intensivas de coleta de dados 
                         durante os anos de 2009 e 2010, correspondendo aos 
                         per{\'{\i}}odos de seca e cheia. O fluxo de metano foi 
                         determinado usando a t{\'e}cnica de c{\^a}mara est{\'a}tica. Em 
                         cada ponto de coleta foi medida a profundidade, temperatura da 
                         {\'a}gua, pH, potencial de oxirredu{\c{c}}{\~a}o, oxig{\^e}nio 
                         dissolvido e total de s{\'o}lidos dissolvidos. Os fluxos foram 
                         classificados em difusivos e ebulitivos, com m{\'e}dia de 11,1 ± 
                         13,5 mg CH4 m -2 d-1 e 275,9 ± 348,5 mg CH4 m -2 d-1, 
                         respectivamente, que {\'e} um valor pr{\'o}ximo ao observado em 
                         outras regi{\~o}es alagadas tropicais. A aplica{\c{c}}{\~a}o de 
                         teste t mostrou diferen{\c{c}}a estat{\'{\i}}stica 
                         significativa (p \≤ 0,05) entre os dois per{\'{\i}}odos, 
                         com os maiores valores m{\'e}dios ocorrendo na 
                         esta{\c{c}}{\~a}o de cheia. Durante o per{\'{\i}}odo de seca 
                         houve um predom{\'{\i}}nio de fluxos difusivos (83%) em 
                         rela{\c{c}}{\~a}o aos ebulitivos. Na cheia ocorreram mais casos 
                         de fluxo ebulitivo (77%). As an{\'a}lises estat{\'{\i}}sticas 
                         de correla{\c{c}}{\~a}o e An{\'a}lise de Componentes Principais 
                         demostraram que as intera{\c{c}}{\~o}es entre 
                         caracter{\'{\i}}sticas f{\'{\i}}sico-qu{\'{\i}}micas da 
                         {\'a}gua podem influenciar o fluxo de metano. Os fluxos difusivos 
                         apresentaram correla{\c{c}}{\~a}o principalmente com pH, 
                         potencial de oxirredu{\c{c}}{\~a}o e oxig{\^e}nio dissolvido, 
                         que est{\~a}o de acordo com o aumento de mat{\'e}ria 
                         org{\^a}nica durante o alagamento do Pantanal. Fluxos ebulitivos 
                         no per{\'{\i}}odo da seca tiveram influ{\^e}ncia da 
                         profundidade, temperatura da {\'a}gua, pH e potencial de 
                         oxirredu{\c{c}}{\~a}o que indicam que o ambiente foi 
                         prop{\'{\i}}cio para a forma{\c{c}}{\~a}o de bolhas ou para 
                         sua libera{\c{c}}{\~a}o do sedimento.",
                  doi = "10.4136/ambi-agua.1775",
                  url = "http://dx.doi.org/10.4136/ambi-agua.1775",
                 issn = "1980-993X",
             language = "pt",
           targetfile = "silva_analise.pdf",
        urlaccessdate = "27 abr. 2024"
}