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widespread use of fire for land management, together with the extensive areas of fire-prone native vegetation. Among these areas, the southern and eastern edges of the Brazilian Amazon, known as the arc of deforestation, together with adjacent cerrado (savanna) areas, have the highest consistent fire counts from satellite data of any region in Brazil every year from June to October ( Prins et al. 1998 ; additional information available online at http://www.cptec.inpe.br/queimadas , or http
widespread use of fire for land management, together with the extensive areas of fire-prone native vegetation. Among these areas, the southern and eastern edges of the Brazilian Amazon, known as the arc of deforestation, together with adjacent cerrado (savanna) areas, have the highest consistent fire counts from satellite data of any region in Brazil every year from June to October ( Prins et al. 1998 ; additional information available online at http://www.cptec.inpe.br/queimadas , or http
Amazonia: Acre, Brazil; and Carbon Dynamics Project 5: Amazon scenarios: modeling interactions among land use, fire, and climate. This research and analysis builds on the MODIS land team’s validation strategy to derive MODIS-like products from high-resolution imagery and compare these to MODIS products ( Morisette et al. 2002 ). The research is integrated with the Global Observation of Forest Cover (GOFC)/Global Observation of Land Dynamics (GOLD) program and the Committee on Earth Observing Satellites
Amazonia: Acre, Brazil; and Carbon Dynamics Project 5: Amazon scenarios: modeling interactions among land use, fire, and climate. This research and analysis builds on the MODIS land team’s validation strategy to derive MODIS-like products from high-resolution imagery and compare these to MODIS products ( Morisette et al. 2002 ). The research is integrated with the Global Observation of Forest Cover (GOFC)/Global Observation of Land Dynamics (GOLD) program and the Committee on Earth Observing Satellites
( Davidson et al. 2000 ). The soils of tropical forests are globally important sources of both N 2 O and NO ( Matson and Vitousek 1990 ; Davidson and Kingerlee 1997 ). Well-drained upland soils generally consume CH 4 from the atmosphere and soil moisture content regulates the flux through its control on the diffusion of CH 4 into the soil ( Crill 1991 ; Born et al. 1990 ). Tropical forest soils can change from a sink to a source of CH 4 depending upon soil moisture conditions and land use ( Keller
( Davidson et al. 2000 ). The soils of tropical forests are globally important sources of both N 2 O and NO ( Matson and Vitousek 1990 ; Davidson and Kingerlee 1997 ). Well-drained upland soils generally consume CH 4 from the atmosphere and soil moisture content regulates the flux through its control on the diffusion of CH 4 into the soil ( Crill 1991 ; Born et al. 1990 ). Tropical forest soils can change from a sink to a source of CH 4 depending upon soil moisture conditions and land use ( Keller
, and Instituto Nacional de Pesquisas Espaciais in São José dos Campos, Sao Paolo, Brazil, for support during data analysis and field validation components of this research, and the NASA and Instituto Nacional de Pesquisas da Amazônia coordinators of the Large-Scale Biosphere–Atmosphere Project in the Amazon for their continued collaboration. Data for this study were provided by the Land Processes Distributed Active Archive Center (LP-DAAC; information available online at http
, and Instituto Nacional de Pesquisas Espaciais in São José dos Campos, Sao Paolo, Brazil, for support during data analysis and field validation components of this research, and the NASA and Instituto Nacional de Pesquisas da Amazônia coordinators of the Large-Scale Biosphere–Atmosphere Project in the Amazon for their continued collaboration. Data for this study were provided by the Land Processes Distributed Active Archive Center (LP-DAAC; information available online at http
ultimate goal in assimilating precipitation was not only to improve the precipitation fields but also coupled land–atmosphere interactions with land surface processes that are heavily dependent upon accurate precipitation. This coupled methodology could provide a potentially improved alternative to current offline data assimilations. Research to investigate other possible improvements is currently underway for the United States and other domains and will be reported in subsequent studies
ultimate goal in assimilating precipitation was not only to improve the precipitation fields but also coupled land–atmosphere interactions with land surface processes that are heavily dependent upon accurate precipitation. This coupled methodology could provide a potentially improved alternative to current offline data assimilations. Research to investigate other possible improvements is currently underway for the United States and other domains and will be reported in subsequent studies
the Amazon (LBA), which seeks a better understanding of the interactions between Amazonian ecosystems and the atmosphere. In a sense, the present work provides the tools for computations of gross primary productivity (GPP) and for the evaluation of the biological control exerted by local vegetation over carbon and water fluxes. In an extension of this study we plan to use these data to test the ability to scale leaf-level fluxes to the whole canopy. 2. Methods and materials 2.1. Study site Primary
the Amazon (LBA), which seeks a better understanding of the interactions between Amazonian ecosystems and the atmosphere. In a sense, the present work provides the tools for computations of gross primary productivity (GPP) and for the evaluation of the biological control exerted by local vegetation over carbon and water fluxes. In an extension of this study we plan to use these data to test the ability to scale leaf-level fluxes to the whole canopy. 2. Methods and materials 2.1. Study site Primary
. 2005 . Soil-atmosphere exchange of nitrous oxide, nitric oxide, methane, and carbon dioxide in logged and undisturbed forest in the Tapajós National Forest, Brazil. Earth Interactions 9 . in press. [Available online at http://EarthInteractions.org .] . Laurance , W. F. , P. M. Fearnside , S. G. Laurance , P. Delamonica , T. E. Lovejoy , J. Rankinde Merona , J. Q. Chambers , and C. Gascon . 1999 . Relationship between soils and Amazon forest biomass: A landscape
. 2005 . Soil-atmosphere exchange of nitrous oxide, nitric oxide, methane, and carbon dioxide in logged and undisturbed forest in the Tapajós National Forest, Brazil. Earth Interactions 9 . in press. [Available online at http://EarthInteractions.org .] . Laurance , W. F. , P. M. Fearnside , S. G. Laurance , P. Delamonica , T. E. Lovejoy , J. Rankinde Merona , J. Q. Chambers , and C. Gascon . 1999 . Relationship between soils and Amazon forest biomass: A landscape
