Methane Flux
Mostrando 13-19 de 19 artigos, teses e dissertações.
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13. Imagens EOS-MODIS e LANDSAT 5 TM no estudo da dinâmica das comunidades de macrófitas na várzea amazônica / EOS-MODIS and LANDSAT 5 images for the study of macrophyte community dinamics in the Amazon varzea
Wetlands encompass about 4 to 6% of the terrestrial surface, occurring in all climates, from the tropics to the tundra, in all continents, and exhibit considerable function in the global carbon cycle, being responsible for up to 72% of the global total methane emissions by non-anthropogenic sources. The Amazon river floodplain is one of the most extensive ar
Publicado em: 2004
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14. Distribution and Rate of Methane Oxidation in Sediments of the Florida Everglades †
Rates of methane emission from intact cores were measured during anoxic dark and oxic light and dark incubations. Rates of methane oxidation were calculated on the basis of oxic incubations by using the anoxic emissions as an estimate of the maximum potential flux. This technique indicated that methane oxidation consumed up to 91% of the maximum potential fl
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15. Characterization of Methanotrophic Bacterial Populations in Soils Showing Atmospheric Methane Uptake
The global methane cycle includes both terrestrial and atmospheric processes and may contribute to feedback regulation of the climate. Most oxic soils are a net sink for methane, and these soils consume approximately 20 to 60 Tg of methane per year. The soil sink for atmospheric methane is microbially mediated and sensitive to disturbance. A decrease in the
American Society for Microbiology.
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16. Bacteria and Archaea Physically Associated with Gulf of Mexico Gas Hydrates
Although there is significant interest in the potential interactions of microbes with gas hydrate, no direct physical association between them has been demonstrated. We examined several intact samples of naturally occurring gas hydrate from the Gulf of Mexico for evidence of microbes. All samples were collected from anaerobic hemipelagic mud within the gas h
American Society for Microbiology.
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17. Attributes of Atmospheric Carbon Monoxide Oxidation by Maine Forest Soils†
CO, one of the most important trace gases, regulates tropospheric methane, hydroxyl radical, and ozone contents. Ten to 25% of the estimated global CO flux may be consumed by soils annually. Depth profiles for 14CO oxidation and CO concentration indicated that CO oxidation occurred primarily in surface soils and that photooxidation of soil organic matter did
American Society for Microbiology.
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18. Soil microorganisms as controllers of atmospheric trace gases (H2, CO, CH4, OCS, N2O, and NO).
Production and consumption processes in soils contribute to the global cycles of many trace gases (CH4, CO, OCS, H2, N2O, and NO) that are relevant for atmospheric chemistry and climate. Soil microbial processes contribute substantially to the budgets of atmospheric trace gases. The flux of trace gases between soil and atmosphere is usually the result of sim
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19. Simulation Model of the Coupling between Nitrification and Denitrification in a Freshwater Sediment
A model was constructed to simulate the results of experiments which investigated nitrification and denitrification in the freshwater sediment of Lake Vilhelmsborg, Denmark (K. Jensen, N. P. Sloth, N. Risgaard-Petersen, S. Rysgaard, and N. P. Revsbech, Appl. Environ. Microbiol. 60:2094-2100, 1994). The model output faithfully represented the profiles of O2 a