Enhancement of cloudless skies frequency over a large tropical reservoir in Brazil.
Several studies show the effects of lake breezes on cloudiness over natural lakes and large rivers, but only few contain information regarding large flooded areas of hydroelectric dams. Most Brazilian hydropower plants have large water reservoirs that may induce significant changes in the local envi...
por Portal Padrão
publicado
06/09/2020
5:37 PM
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
Sea surface height trends in the southern hemisphere oceans simulated by the Brazilian Earth System Model under RCP4.5 and RCP8.5 scenarios
The Brazilian Earth System Model (BESM-OA2.5), while simulating the historical period proposed by the fifth phase of the Coupled Model Intercomparison Project (CMIP5), detects an increasing trend in the sea surface height (SSH) on the southern hemisphere oceans relative to that of the pre-industrial...
por Portal Padrão
publicado
25/08/2020
8:38 AM
Seasonal variation of surface radiation and energy balances over two contrasting areas of the seasonally dry tropical forest (Caatinga) in the Brazilian semi-arid.
Arid and semi-arid environments correspond to one-third of the Earths terrestrial surface. In these environments, precipitation is an essential and limiting element for vegetation growth and ecosystem biomass productivity. The semi-arid region of Brazil comprises around 11.5% of the national territo...
por Portal Padrão
publicado
18/08/2020
9:50 AM
Exploring nasa’s harmonized landsat and sentinel-2 (HLS) dataset to monitor deforestation in the amazon rainforest. International Archives of the Photogrammetry
Deforestation is a threat to biodiversity and the worlds climate. As agriculture and mining areas grow, forest loss becomes unbearable for the environment. Consequently, monitoring deforestation is crucial for decision makers to create polices. The most reliable deforestation data about the Amazon f...
por Portal Padrão
publicado
06/08/2020
5:43 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
A new background method for greenhouse gases flux calculation based in back-trajectories over the Amazon
The large amount of carbon stored in trees and soils of the Amazon rain forest is under pressure from land use as well as climate change. Therefore, various efforts to monitor greenhouse gas exchange between the Amazon forest and the atmosphere are now ongoing, including regular vertical profile (su...
por Portal Padrão
publicado
25/07/2020
8:29 AM
Use of forest fragments and agricultural matrices by small mammals in southeastern brazil.
The use of matrix by species that naturally inhabit forest fragments can be an important instrument to restore connectivity in fragmented landscapes. The type and structure of the matrix are determinant for this connectivity, however, few studies have explored this theme. In this study, we evaluated...
por Portal Padrão
publicado
18/07/2020
9:40 AM
Precipitation diurnal cycle assessment of satellite-based estimates over Brazil
The main objective of this study is to assess the ability of several high-resolution satellite-based precipitation estimates to represent the Precipitation Diurnal Cycle (PDC) over Brazil during the 20142018 period, after the launch of the Global Precipitation Measurement satellite (GPM). The select...
por Portal Padrão
publicado
18/07/2020
9:34 AM
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
Dinâmica de serapilheira em uma área de floresta de terra firme, Amazônia Ocidental.
O objetivo deste estudo foi avaliar a produção e decomposição de serapilheira em uma área de floresta primária de terra firme na Reserva Biológica do Jaru. Para tanto, foi implantada uma parcela permanente de 1 hectare, onde foram demarcadas 25 subparcelas com 20 x 20 m cada. Para a coleta de...
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