Eventos extremos de precipitação no estado do Ceará e suas relações com a temperatura dos oceanos tropicais

Santos, Carlos Antônio Costa dos; Manzi, A. O.

doi:10.1590/s0102-77862011000100014

Cited by 17 publications

(18 citation statements)

References 16 publications

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“…Thus, our results are coherent with those reported by Minetti (1998) and Minetti et al (2003), Rusticucci and Penalba (2000), Haylock et al (2006) Santos and Brito (2007) and Santos and Manzi (2011). …”

Section: Resultssupporting

confidence: 94%

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<b>Detection of climate trends in macroregions of the Ceará State using FUNCEME data

Silva

2016

Acta Sci. Technol.

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ABSTRACT. The goal of this study was to apply the Mann-Kendall test to the rainfall data of eight macroregions of the Ceará State aiming to determine climate trends in their time series. To this end were used rainfall data obtained by the FUNCEME for the period 1974-2011. The Mann-Kendall test was applied to verify trends in rainfall series, and the Students's t-test to check significant differences in the trend values. Downward trends in annual rainfall were found for the metropolitan region of Fortaleza, Sertão dos Inhamuns and Sertão Central, areas that also presented smaller green areas and/or fewer vegetated areas. Upward trends in rainfall were observed on the West Coast, Sobral/Ibiapaba, Baturité, East Coast/ Jaguaribe and Cariri/South Central.

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Section: Resultssupporting

confidence: 94%

“…Santos, Brito, Ramana Rao, and Menezes (2009) identified local changes in rainfall and an increase in humidity conditions for the Ceará State. At last, Santos and Manzi (2011) verified that only the northern region of the Ceará had trends with high statistical significance for the indices of extreme events used in the study.…”

Section: Resultsmentioning

confidence: 57%

<b>Detection of climate trends in macroregions of the Ceará State using FUNCEME data

Silva

2016

Acta Sci. Technol.

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“…As observed by Santos and Brito (2007) and Santos and Manzi (2011), the SST negative anomalies (positive) over the North Atlantic Ocean, and the positive (negative) anomalies over the South Atlantic Ocean, produced the displacement of the ITCZ southwards (northwards), favoring rainfall events (inhibition of rain) on the NEB. Moura et al (2009) noticed that, when the ITCZ takes place in the northern hemisphere, it exhibits an SST much warmer than usual.…”

Section: Introductionsupporting

confidence: 55%

“…Such order of magnitude is considered normal for correlations of SST indices for the NEB region: as investigated by Santos and Manzi (2011) for the state of Ceará, and by Santos and Brito (2007) for the Brazilian semi-arid and by Araújo and Brito (2011) for Bahia and Sergipe.…”

Section: Resultsmentioning

confidence: 99%

Influence of oceanic-atmospheric interactions on extreme events of daily rainfall in the Sub-basin 39 located in Northeastern Brazil

Salgueiro¹,

Montenegro

Pinto

et al. 2016

RBRH

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Changes in extreme precipitation have been observed in regions where frequent rainfalls occur over short periods of time followed by prolonged droughts, creating, as a result, new watershed scenarios. Recent studies have attributed such occurrences to possible climate changes. This paper analyzes the correlation between extreme events recorded in the Sub-basin 39, located in Northeastern Brazil, and the anomalies caused by sea surface temperature -SST and the atmospheric systems operating in the region. Pearson correlation coefficients have been used combined with the variables analyzed. For such, trends in precipitation have been obtained by using the method of least squares together with linear regression and the Student's t test. The results obtained have demonstrated that due to the geographical position of the region investigated, both maximum extreme events (areas with positive trends) and minimum extreme events (areas with negative trends) are more dependent on the Dipole Atlantic than on the effects of El Niño Southern Oscillation -ENOS.Keywords: Climate change; Maximum precipitation; Minimum precipitation; Influence on TSM. RESUMOAs alterações nos extremos pluviométricos estão sendo observadas em várias localidades, com uma frequência maior de chuvas intensas concentradas em poucos dias e estiagens mais prolongadas, passando a caracterizar novos cenários nas bacias hidrográficas. Estudos específicos vêm atribuindo tais ocorrências às possíveis modificações climáticas. Este artigo analisou a relação existente entre os eventos extremos registrados na Sub-bacia 39, localizada no Nordeste do Brasil, com as anomalias das Temperaturas da Superfície do Mar (TSM) e os sistemas atmosféricos atuantes na região, utilizando os coeficientes de correlação de Pearson entre as variáveis analisadas. Para isso, as tendências da precipitação foram obtidas utilizando o Método dos Mínimos Quadrados, associado à regressão linear e o teste t de Student. Os resultados evidenciaram que devido à posição geográfica da região estudada, tanto os eventos extremos máximos (áreas com tendências positivas) como os eventos extremos mínimos (áreas com tendências negativas) são bem mais dependentes do Dipolo do Atlântico do que das influências do El Niño/Oscilação Sul -ENOS.Palavras-chave: Mudanças climáticas; Precipitações máximas; Precipitações mínimas; Influência de TSM.

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“…This variability, whether on an annual or monthly scale, is defined by the different weather systems which are related to sea surface temperatures (SST) in the Pacific or tropical Atlantic (HASTENRATH, 2012;ALVES et al, 2006;SUN et al, 2006). The source inducing rainfall from February to May is related to the advancement of the Intertropical Convergence Zone (ITCZ) over the southern hemisphere (SANTOS; BRITO, 2007, MENEZES et al, 2008MANZI, 2011). When the SST in the Atlantic favour formation of more-intense southeasterly trade winds, and northeasterly trade winds of low intensity, there is a reduction or absence of rainfall between March and April over the Brazilian Northeast (HASTENRATH, 2012).…”

Section: Introductionmentioning

confidence: 99%

Uncertainties of the rainfall regime in a tropical semi-arid region: the case of the State of Ceará

Andrade

Sena

Silva

et al. 2016

AGRO@MBIENTE ON-LINE

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Abstract:The rural population of a tropical semi-arid region such as the northeast of Brazil is directly dependent on rainfall for agricultural production, pasture for livestock, and the storage of drinking water for human consumption. The region is characterised by the frequent occurrence of dry years and consecutive dry days (CDD) during the rainy season, demonstrating the vulnerability of rainfed agriculture. The aim of this study therefore, was to identify homogeneous regions of the State of Ceará where there is greater or lesser uncertainty of the rainfall regime. Accordingly, the occurrence of dry and very dry years were investigated as uncertainties between years, together with the occurrence of two classes of CDD (10-20 and 21-30 days) during the rainy season. To define similar regions as to the uncertainty of the rainfall regime, the technique of Hierarchical Cluster Analysis (HCA) was used. The study considered time series of least 30 years, from 77 rain gauge stations around the state of Ceará. The use of HCA resulted in the formation of seven homogenous groups in both of the phenomena being investigated. Municipalities in the Central Backlands, the Inhamuns Backlands and the Jaguaribana Region displayed a higher frequency of both inter-annual (dry years) and intra-annual (CDD) uncertainty, demonstrating the greater vulnerability of rainfed agriculture. The occurrence of a CDD event is not dependent on the total annual rainfall, as several stations with an average rainfall higher than that of the state showed potential for the occurrence of CDD. The number of CDD events recorded in the 11-20 day class was higher than in the 21-30 day class.

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Eventos extremos de precipitação no estado do Ceará e suas relações com a temperatura dos oceanos tropicais

Cited by 17 publications

References 16 publications

<b>Detection of climate trends in macroregions of the Ceará State using FUNCEME data

<b>Detection of climate trends in macroregions of the Ceará State using FUNCEME data

Influence of oceanic-atmospheric interactions on extreme events of daily rainfall in the Sub-basin 39 located in Northeastern Brazil

Uncertainties of the rainfall regime in a tropical semi-arid region: the case of the State of Ceará

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