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Nitrous oxide fluxes over establishing biofuel crops: characterization of temporal variability using the cross-wavelet analysis.

Emissions of nitrous oxide (N2O) over croplands are a major source of greenhouse gases to the atmosphere. The precise accounting of sources of N2O is essential to national and global budgets, as well as the understanding of the spatial and temporal relationships with environmental variables such as ...
  • por Portal Padrão
  • publicado
  • 14/09/2020
  • 11:36 AM

Refining national greenhouse gas inventories.

The importance of greenhouse gas inventories cannot be overstated: the process of producing inventories informs strategies that governments will use to meet emissions reduction targets. The Intergovernmental Panel on Climate Change (IPCC) leads an effort to develop and refine internationally agreed ...
  • por Portal Padrão
  • publicado
  • 14/09/2020
  • 11:35 AM

Biological nitrogen fixation across major biomes in Latin America: patterns and global change effects.

Biological nitrogen fixation (BNF) supports terrestrial primary productivity and plays key roles in mediating human-induced changes in global nitrogen (N) and carbon cycling. However, there are still critical uncertainties in our understanding of the amount of BNF occurring across terrestrial ecosys...
  • por Portal Padrão
  • publicado
  • 14/09/2020
  • 11:32 AM

Spatiotemporal data analysis with chronological networks.

The number of spatiotemporal data sets has increased rapidly in the last years, which demands robust and fast methods to extract information from this kind of data. Here, we propose a network-based model, called Chronnet, for spatiotemporal data analysis. The network construction process consists of...
  • por Portal Padrão
  • publicado
  • 14/09/2020
  • 11:31 AM

Downscaling of climate extremes over South America – Part I: model evaluation in the reference climate.

In this paper, we evaluate temperature and precipitation trends over South America (SA), simulated by the regional Eta model with 20-km horizontal resolution nested to three global models: The Canadian Earth System Model Second Generation (CanESM2-ES), The Met Office Hadley Centre Global Environment...
  • por Portal Padrão
  • publicado
  • 14/09/2020
  • 11:29 AM

Corrigendum to “Analysis of areas undergoing desertification, using EVI2 multi-temporal data based on MODIS imagery as indicator”

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  • por Portal Padrão
  • publicado
  • 14/09/2020
  • 11:26 AM

Evapotranspiration and gross primary productivity of secondary vegetation in Amazonia inferred by eddy covariance.

The conversion of primary forest (PF) to other types of land cover, such as pasture and agriculture, in Amazonia, affects regional carbon and water balances, significantly contributing to increased carbon emissions and reduced evapotranspiration. However, secondary forest (SF) growth, resulting from...
  • por Portal Padrão
  • publicado
  • 28/08/2020
  • 5:32 PM

Evaluation of a field-deployable Nafion™-based air-drying system for collecting whole air samples and its application to stable isotope measurements of CO2.

Atmospheric flask samples are either collected at atmospheric pressure by opening a valve of a pre-evacuated flask or pressurized with the help of a pump to a few bar above ambient pressure. Under humid conditions, there is a risk that water vapor in the sample leads to condensation on the walls of ...
  • por Portal Padrão
  • publicado
  • 28/07/2020
  • 5:28 PM

The impact of climate change on Brazil’s agriculture.

Brazilian agricultural production provides a significant fraction of the food consumed globally, with the country among the top exporters of soybeans, sugar, and beef. However, current advances in Brazilian agriculture can be directly impacted by climate change and resulting biophysical effects. Her...
  • por Portal Padrão
  • publicado
  • 15/07/2020
  • 11:33 AM

Analysis of areas undergoing desertification, using EVI2 multi-temporal data based on MODIS imagery as indicator.

Desertification is a global problem that impacts a significative part of the Earth's surface, which cause a large environmental and social losses in several regions of the world. The Brazilian semiarid region, located mainly in the northeast part of the country, includes areas of moderate to very hi...
  • por Portal Padrão
  • publicado
  • 15/07/2020
  • 11:26 AM

Characterizing spatio-temporal patterns of social vulnerability to droughts, degradation and desertification in the Brazilian northeast.

Examples of how environmental susceptibility has a direct impact on the social vulnerability of a population, by affecting both the social and cultural life quality are discussed for the Northeast of Brazil, which is considered to be the poorest region of the country. Several direct and indirect mec...
  • por Portal Padrão
  • publicado
  • 21/06/2020
  • 12:33 PM

Interannual variability of carbon uptake of secondary forests in the Brazilian Amazon (2004-2014).

Tropical secondary forests (SF) play an important role in the global carbon cycle as a major terrestrial carbon sink. Here, we use high‐resolution TerraClass data set for tracking land use activities in the Brazilian Amazon from 20042014 to detect spatial patterns and carbon sequestration dynamics...
  • por Portal Padrão
  • publicado
  • 15/06/2020
  • 11:29 AM