Navegando por Autor "CAMPOS, Mayara Soares"

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Acesso aberto (Open Access)
Estudo do albedo da palma de óleo em comparação a diferentes usos e cobertura do solo no leste da Amazônia
(Universidade Federal do Pará, 2018-04-26) CAMPOS, Mayara Soares; ARAÚJO, Alessandro Carioca de; http://lattes.cnpq.br/6188087583954899; ADAMI, Marcos; http://lattes.cnpq.br/7484071887086439
The advance of the agricultural frontier in the Amazon region has been continuous in these recent years, especially in the eastern Amazon with the expansion of oil palm cultivation, which has caused many changes in the land cover of the region. In this way, considering the need to understand the response of the oil palm culture to changes in the surface albedo, this study aims to assess the albedo fluctuations in oil palm cultivation area. In order to do this, we compared the albedo values observed by a micrometeorological tower with those estimated from orbital data, based on the products of Landsat 8/OLI and Terra/MODIS satellites. The oil palm albedo was also compared with the albedo of others land use and land cover as pasture, forest and secondary vegetation. This analysis showed that the values observed in situ (non-imaging sensor) for the oil palm cultivation are statistically the same as those estimated by the two orbital sensors (imaging sensor) and they ranged from 0.14 to 0.15 in the dry season. The results also showed a good agreement between the albedo estimated by the orbital sensors. Moreover, the evaluation of the similarity between the other types of uses and coverings in relation to the surface albedo were significantly different from each other, which present the following pattern: Pasture > Oil Palm > Secondary vegetation > Forest. This result suggests that conversions from one land cover to another can influence the radiation balance on the surface and thereby trigger climate change. These information presented in this research can contributes to better understand the albedo fluctuation values of oil palm surface and other land covers in a satisfactory way and can also contribute with information for possible parameterizations of climate simulations models and environmental impacts.
Acesso aberto (Open Access)
Impactos das mudanças climáticas na biomassa florestal Amazônica: Previsão de perda e estratégias de conservação prioritárias para o potencial de biomassa sob as mudanças climáticas
(Universidade Federal do Pará, 2024-04-25) CAMPOS, Mayara Soares; ANJOS, Luciano Jorge Serejo dos; http://lattes.cnpq.br/0244738999001686; https://orcid.org/0000-0002-3270-6679; ADAMI, Marcos; http://lattes.cnpq.br/7484071887086439; https://orcid.org/0000-0003-4247-4477
The study addresses the influence of climate change on Aboveground Biomass (AGB) in the Amazon, examining both reduction forecasts and potential increases under different climate scenarios until the end of the century. Using AGB data (GEDI) and climate variables from Global Circulation Models (GCM‘s) and Shared Socioeconomic Pathways (SSP‘s), the research employs Geographically Weighted Regression (GWR) to explore spatial patterns of AGB distribution. The results point to a significant decline in AGB, with estimated reductions ranging from 14.2% to 32.1%, where the average vegetation density could drop to 177.61 Mg/ha-1 by 2040 and 140.43 Mg/ha-1 by 2100, indicating a decrease in the forest's carbon sequestration capacity, especially in the northeast, central-east, west, and south regions of the Amazon. Conversely, potential AGB gains were identified in specific areas of the Brazilian Amazon, mainly in the northwest and southeast regions, covering the Negro, Xingu, and Tapajós river basins, under both future scenarios. Indigenous Lands (TI‘s) emerge as crucial for conservation, exhibiting greater AGB gains in both scenarios analyzed. This study underscores the importance of mitigation strategies and the role of protected areas in maintaining Amazon resilience in the face of future climate adversities. By highlighting areas of potential AGB increase, it emphasizes the significance of preserving and valuing protected areas and TI‘s as fundamental strategies to address environmental and climate challenges. This approach not only focuses on mitigating AGB loss but also recognizes the potential of specific regions to positively contribute to Amazon resilience amid future climate changes. Therefore, this study is of great importance for both science and public policy formulations, as it provides an analysis of the impact of AGB climate change in the Amazon, essential in the carbon cycle and, by extension, in mitigating global climate change. By identifying vulnerable regions and those with potential AGB increase, it highlights the urgency of targeted conservation strategies.