Navegando por Autor "SOUZA, Paulo Fernando de Souza"

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Acesso aberto (Open Access)
Climatologia da estrutura vertical da atmosfera em novembro para Belém-PA
(2010-06) ANANIAS, Daniela dos Santos; SOUZA, Everaldo Barreiros de; SOUZA, Paulo Fernando de Souza; SOUSA, Adriano Marlisom Leão de; VITORINO, Maria Isabel; TEIXEIRA, Gleyciano Mendes; FERREIRA, Douglas Batista da Silva
The present work reports a diagnostic study on the vertical structure of air temperature, dew point temperature and relative humidity over the region of Belém-PA (eastern Amazon), based on monthly dataset for a period of 26 years (1982 to 2007). The focus is on the transition period from dry to wet season in the eastern Amazon, i.e., the month of November. Two contrasting composites in relation to the rainfall regime were considered: the wet and the dry year's composites, which were established objectively by the percentiles method. The results showed that the main difference observed in the temperature and humidity profiles, comparing dry and wet years, occurs in the atmospheric layer between the middle and upper levels of the troposphere (between the patterns level from 700 hPa to 400 hPa). In this layer, the difference between air temperatures and dew point is significantly higher and the contrast of moisture associated with convection also shows the highest values. In general, the compositions showed that the temperature profiles anomalously warmer (cold) and the moisture profiles anomalously wetter (dry) are associate to the years of rainfall above (below) of normal in the region of Belém-PA.
Acesso aberto (Open Access)
Impactos dos anos climáticos extremos no rendimento da lavoura temporária de mandioca na região rural da metrópole de Belém – Pará
(Universidade Federal do Pará, 2017-01-31) SOUZA, Paulo Fernando de Souza; SOUZA, Everaldo Barreiros de; http://lattes.cnpq.br/6257794694839685
Extremes climatic patterns negatively impact agriculture in Brazil and, as a result, cause problems for rural communities that are highly dependent on natural resources, in particular the state of Pará. Therefore, it is of fundamental importance to study the cassava farming (Manihot esculenta Crantz) in face of future climatic risks, because Pará is the largest national producer. The objective of this study was to analyze the modulation of the climatic mechanisms of the Pacific and Atlantic Oceans on the pluviometric regime considering the municipal scale of the Rural Region of the Metropolis of Belém (RRB), in northeastern Pará, as well as to detect the relations between precipitation and productivity or yield of temporary cassava farming from 1990 to 2014 (25 years), including the analysis of impacts of extreme climatic years. The work was divided into three parts: the first analyzed the influence of climatic extremes such as El Niño, La Niña, North and South Gradient on RRB precipitation, using the percentiles technique; In the second part, Spearman correlations were calculated between the precipitation and the cassava yield and the results showed an inhomogeneous behavior throughout the region, i.e., there are municipalities that respond directly or indirectly to the pluviometric regime. In this analysis, the annual precipitation showed a better relationship with cassava yield, whose planting system occurs at two moments during the year (summer and winter plantings). In the third part, the spatial data exploratory spatial analysis technique was applied, which revealed the need to consider the spatial component in the evaluation of the relations between regional climate x agriculture.
Acesso aberto (Open Access)
Precipitação sazonal sobre a Amazônia oriental no período chuvoso: observações e simulações regionais com o RegCM3
(2009-06) SOUZA, Everaldo Barreiros de; LOPES, Marcio Nirlando Gomes; ROCHA, Edson José Paulino da; SOUZA, José Ricardo Santos de; CUNHA, Alan Cavalcanti da; SILVA, Renato Ramos da; FERREIRA, Douglas Batista da Silva; SANTOS, Daniel Meninéa; CARMO, Alexandre Melo Casseb do; SOUSA, José Raimundo Abreu de; GUIMARÃES, Paulo Lima; MOTA, Maria Aurora Santos da; MAKINO, Midori; SENNA, Renato Cruz; SOUSA, Adriano Marlisom Leão de; MOTA, Galdino Viana; KUHN, Paulo Afonso Fischer; SOUZA, Paulo Fernando de Souza; VITORINO, Maria Isabel
This paper presents a contribution on the climate modelling studies with emphasis on seasonal rainfall variability in eastern Amazonia, during the austral summer and autumn seasons (DJF and MAM). Based on RegCM3 regional climate simulations for a 26 years period (1982/83 to 2007/08) using high resolution domain scale (30 km) and two different convection schemes (Grell and MIT), it was investigated the model performance to simulate the regional pluviometric distribution in eastern Amazon, with reference to a new observational data base containing regional aspects extracted from a dense rain gauge station network. The quantitative analysis showed that RegCM3 presents systematic errors, especially those related to the dry bias in the Amapá and north/northeast of Pará using both schemes Grell and MIT, which indicate that the model does not reproduce ITCZ characteristics over equatorial Atlantic. The simulations using MIT also indicated wet bias in the southwest/south/southeast of Pará and north of Tocantins. Moreover, through composites technique, it was also investigated RegCM3 response to reproduce the anomalous spatial rainfall patterns in association with ENSO episodes and interhemispheric SSTa gradient phases across the intertropical Atlantic. The results showed that the model represented realistically well the spatial pattern related to the rainfall anomalies above (below) than normal in most of eastern Amazonia, during the known favourable scenarios, i.e., La Niña and south Atlantic SSTa gradient (unfavourable, i.e., El Niño and north Atlantic SSTa gradient).