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| Registros recuperados: 36 | |
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| Blain,Gabriel Constantino; Kayano,Mary Toshie; Sentelhas,Paulo Cesar; Lulu,Jorge. |
| Considering the importance of the ratio between the actual and potential evapotranspiration (AE/PE) for agricultural purposes, the present study estimated the 10-day based AE/PE, aiming to evaluate possible influences of the Pacific Decadal Oscillation (PDO), on temporal variability series, in the region of Campinas, São Paulo State, Brazil. The shapes of the beta probability density function of the AE/PE series for four periods (two in the cold PDO phase and two in the warm PDO phase) do not show differences between the PDO phases. In this sense, the use of "average periods" to obtain a standard climatology for agrometeorological purposes (such as the climate normal of the 1961-1990 period, which encompasses sixteen years of the cold PDO phase and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climate normal; Sea surface temperature. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052009000300029 |
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| Blain,Gabriel Constantino. |
| O objetivo do trabalho foi detectar tendências climáticas nas séries de precipitação pluvial (PRE) de oito localidades do Estado de São Paulo, utilizando o método não paramétrico denominado teste sazonal de Mann-Kendall (SMK). Quando aplicado à localidade de Monte Alegre do Sul, o SMK indicou a presença de tendências de elevação nas séries mensais de setembro e maio. Para as estações meteorológicas de Campinas e Ribeirão Preto, este método não paramétrico indicou a existência de tendências de elevação nas séries relativas ao mês de maio. Na série de Jundiaí foi verificada tendência de elevação apenas quando os totais anuais foram analisados. Nas localidades de Cordeirópolis e Pindorama, nenhuma tendência significativa foi observada. Na localidade de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mudanças climáticas; Teste de Mann Kendall. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000400031 |
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| Blain,Gabriel Constantino. |
| Under the hypothesis that the presence of climate trends in the annual extreme minimum air temperature series of Campinas (Tminabs; 1891-2010; 22º54'S; 47º05'W; 669 m) may no longer be neglected, the aim of the work was to describe the probabilistic structure of this series based on the general extreme value distribution (GEV) with parameters estimated as a function of a time covariate. The results obtained by applying the likelihood ratio test and the percentil-percentil and quantil-quantil plots, have indicated that the use of a time-dependent model provides a feasible description of the process under evaluation. In this non-stationary GEV model the parameters of location and scale were expressed as time-dependent functions. The shape parameter remained... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Extreme value; Non-stationary; Time-dependent functions. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052011000400031 |
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| Blain,Gabriel Constantino. |
| Several studies have applied the Kolmogorov-Smirnov test (KS) to verify if a particular parametric distribution can be used to assess the probability of occurrence of a given agrometeorological variable. However, when this test is applied to the same data sample from which the distribution parameters have been estimated, it leads to a high probability of failure to reject a false null hypothesis. Although the Lilliefors test had been proposed to remedy this drawback, several studies still use the KS test even when the requirement of independence between the data and the estimated parameters is not met. Aiming at stimulating the use of the Lilliefors test, we revisited the critical values of the Lilliefors test for both gamma (gam) and normal distributions,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Goodness of fit; Gamma distribution; Normal distribution. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052014000200015 |
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| Blain,Gabriel Constantino. |
| O objetivo do trabalho foi detectar tendências e variações climáticas em oito séries de totais anuais de precipitação pluvial do Estado de São Paulo. A fim de obter melhor adequação entre as probabilidades dos erros tipo I e II, as análises foram realizadas do ponto de vista paramétrico e não paramétrico. Nas localidades de Jundiaí e Pindorama foram detectadas marcantes elevações no regime anual dos totais de precipitação. A mesma característica foi observada na localidade de Monte Alegre do Sul, embora com menor significância do que nessas duas primeiras séries. Nas localidades de Campinas, Cordeirópolis, Mococa e Ribeirão Preto não houve indícios de alterações climáticas. Na localidade de Ubatuba foi detectada queda no regime dessa variável meteorológica. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mudança climática; Paramétrico; Não paramétrico. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000300031 |
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| Pedro Júnior,Mário José; Hernandes,José Luiz; Bardin-Camparotto,Ludmila; Blain,Gabriel Constantino. |
| ABSTRACT Plant variables and must physicochemical properties were evaluated for the grapevine ‘Syrah’ cultivated in sequential growing seasons (summer and winter) from 2011 to 2015. The vines were trellised in vertical shoot position, grafted on Paulsen 1103, with approximate density of 5,800 plants∙ha−1. They were grown under plastic overhead cover. The experimental design was completely randomized, and the following variables were measured at the harvest: number of branches, number of clusters, cluster weight and yield, soluble solids content, pH, and titratable acidity. The highest values of yield, cluster weight, and titratable acidity were observed during the summer growing season, while the highest values of soluble solids content and pH were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vitis spp.; Soluble solids; Titratable acidity; Wine grape. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000200345 |
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| Blain,Gabriel Constantino. |
| The aim of this study was to describe monthly series of the Standardized Precipitation Index obtained from four weather stations of the State of São Paulo, Brazil. The analyses were carried out by evaluating the normality assumption of the SPI distributions, the spectral features of these series and, the presence of climatic trends in these datasets. It was observed that the Pearson type III distribution was better than the gamma 2-parameter distribution in providing monthly SPI series closer to the normality assumption inherent to the use of this standardized index. The spectral analyses carried out in the time-frequency domain did not allow us to establish a dominant mode in the analyzed series. In general, the Mann-Kendall and the Pettitt tests... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pearson type III distribution; Drought; Climate trends. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000100018 |
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| Blain,Gabriel Constantino. |
| O objetivo do trabalho foi descrever, com base na distribuição geral dos valores extremos (GEV), a probabilidade de ocorrência associada aos totais máximos anuais de precipitação pluvial diária (Preabs), observados na localidade de Campinas entre 1890 e 2009, verificando também qual método, máxima verossimilhança ou momentos-L, resultam no melhor desempenho da GEV no referido propósito. Após verificação estatística da inexistência de significativas correlações seriais, tendências e periodicidades, observou-se que a GEV pode ser utilizada na descrição das probabilidades associadas aos dados de Preabs, na localidade de Campinas. O método da máxima verossimilhança mostrou-se, por meio do teste Lilliefors e de gráficos Quantil-Quantil, o melhor algoritmo para... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Distribuição geral dos valores extremos; Lilliefors. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052011000300031 |
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| Xavier,Ana Carolina Freitas; Blain,Gabriel Constantino; Morais,Marcos Vinicius Bueno de; Sobierajski,Graciela da Rocha. |
| ABSTRACT The selection of an appropriate nonstationary Generalized Extreme Value (GEV) distribution is frequently based on methods, such as Akaike information criterion (AIC), second-order Akaike information criterion (AICc), Bayesian information criterion (BIC) and likelihood ratio test (LRT). Since these methods compare all GEV-models considered within a selection process, the hypothesis that the number of candidate GEV-models considered in such process affects its own outcomehas been proposed. Thus, this study evaluated the performance of these four selection criteria as function of sample sizes, GEV-shape parameters and different numbers candidate GEV-models. Synthetic series generated from Monte Carlo experiments and annual maximum daily rainfall... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Monte Carlo; GEV; MIROC5; Downscaling. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000400606 |
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| Blain,Gabriel Constantino. |
| The Mann-Kendall test has been used to detect climate trends in several parts of the Globe. Three variance correction approaches (MKD, MKDD and MKRD) have been proposed to remove the influence of serial correlation on this trend test. Thus, the main goal of this study was to evaluate the probability of occurrence of types I and II errors associated with these three approaches. The results obtained by means of Monte Carlo simulations and from a case of study allowed us to drawn the following conclusions: All approaches are capable of meeting the adopted significant level when they are applied to trend-free uncorrelated series. The approaches are as powerful as the original MK test when they are applied to uncorrelated series. Regarding serially correlated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Monte Carlo simulations; Serial correlation; Climate change. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052013000400014 |
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| Registros recuperados: 36 | |
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