In 2015, the dominant greenhouse gases released into Earths atmospherecarbon dioxide, methane, and nitrous oxideall continued to reach new high levels. At Mauna Loa, Hawaii, the annual CO2 concentration increased by a record 3.1 ppm, exceeding 400 ppm for the first time on record. The 2015 global CO...
por Portal Padrão
publicado
20/08/2016
1:42 PM
Upward lightning flashes characteristics from high-speed videos
One hundred high-speed video recordings (72 cases in Brazil and 28 cases in USA) of negative upward lightning flashes were analyzed. All upward flashes were triggered by another discharge, most of them positive CG flashes. A negative leader passing over the tower(s) was frequently seen in the high-s...
por Portal Padrão
publicado
20/07/2016
4:15 PM
Evolution and challenges of dynamic global vegetation models for some aspects of plant physiology and elevated atmospheric CO2
Dynamic global vegetation models (DGVMs) simulate surface processes such as the transfer of energy, water, CO2, and momentum between the terrestrial surface and the atmosphere, biogeochemical cycles, carbon assimilation by vegetation, phenology, and land use change in scenarios of varying atmospheri...
por Portal Padrão
publicado
20/07/2016
4:05 PM
Forest degradation associated with logging frontier expansion in the Amazon: the BR-163 region in southwestern Pará, Brazil.
Forest degradation is the long-term and gradual reduction of canopy cover due to forest fire and unsustainable logging. A critical consequence of this process is increased atmospheric carbon emissions. Although this issue is gaining attention, forest degradation in the Brazilian Amazon has not yet b...
por Portal Padrão
publicado
20/07/2016
4:04 PM
An assessment of urban vulnerability in the Amazon Delta and Estuary: a multi-criterion index of flood exposure, socio-economic conditions and infrastructure
The Amazon Delta and Estuary (ADE) is a region of continental and global ecological importance. Controversy, many of the basic infrastructure and services essential for quality of life and sustainable development of this delta are absent. Using a conceptual model to define socio-economic vulnerabili...
por Portal Padrão
publicado
20/07/2016
3:41 PM
Atmospheric electric field sensors network integration in Brazil
This paper presents the integration details of an operational Atmospheric Electric Field Mill Sensor (EFM) Network for standardized and continuous operation in the region of Saõ José dos Campos, State of Saõ Paulo, Brazil, in order to collect and transmit real time data for studies of atmospheric...
por Portal Padrão
publicado
20/07/2016
3:38 PM
Spatio-temporal change detection from multidimensional arrays: detecting deforestation from MODIS time series.
Growing availability of long-term satellite imagery enables change modeling with advanced spatio-temporal statistical methods. Multidimensional arrays naturally match the structure of spatio-temporal satellite data and can provide a clean modeling process for complex spatio-temporal analysis over la...
por Portal Padrão
publicado
20/07/2016
3:26 PM
A conceptual framework for analyzing deltas as coupled social–ecological systems: an example from the Amazon River Delta
At the nexus of watersheds, land, coastal areas, oceans, and human settlements, river delta regions pose specific challenges to environmental governance and sustainability. Using the Amazon Estuary-Delta region (AD) as our focus, we reflect on the challenges created by the high degree of functional ...
por Portal Padrão
publicado
20/07/2016
2:16 PM
Floristic and structure of an Amazonian primary forest and a chronosequence of secondary succession
The analysis of changes in species composition and vegetation structure in chronosequences improves knowledge on the regeneration patterns following land abandonment in the Amazon. Here, the objective was to perform floristic-structural analysis in mature forests (with/without timber exploitation) a...
por Portal Padrão
publicado
21/06/2016
1:26 PM
Sensitivity of the Amazon biome to high resolution climate change projections
Despite the reduction in deforestation rate in recent years, the impact of global warming by itself can cause changes in vegetation cover. The objective of this work was to investigate the possible changes on the major Brazilian biome, the Amazon Rainforest, under different climate change scenarios....
por Portal Padrão
publicado
20/06/2016
3:27 PM
CO2 and CO emission rates from three forest fire controlled experiments in Western Amazonia
In this work, we analyze the expansion of forestry activities with Eucalyptus in the Paraiba do Sul basin, region located in Sao Paulo, Brazil, from 1986 to 2010. In this region is situated the most important and largest extension of reminiscent of Mata Atlântica Biome reminiscent. This biome has b...
por Portal Padrão
publicado
20/06/2016
2:27 PM
Spondias tuberosa trees grown in tropical, wet environments are more susceptible to drought than those grown in arid environments
In this study, we investigated the different responses of Spondias tuberosa (umbu) trees, which grow in two different ecological life zones in northeast Brazil: tropical wet and tropical arid ecosystems. We evaluated the responses of plants grown under humid and dry conditions by measuring the photo...
Redes Sociais