Changes in the spatial–temporal patterns of droughts in the Brazilian Northeast

Cunha, Ana Paula; Tomasella, Javier; Neto, Germano Ribeiro; Brown, Matthew; Garcia, Sâmia Regina; Brito, Sheila; Carvalho, M. A. de

doi:10.1002/asl.855

Cited by 105 publications

(85 citation statements)

References 35 publications

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“…The 2011/2012 hydrological year exhibited the most severe drought condition, and most of the NE was classified as extreme drought and, in some parts of the central semiarid region, as exceptional drought. As shown in previous studies, the recurrent drought events recorded from ending 2011 to 2017 at NE were considered more intense in terms of duration, severity, and recurrence for at least the last 30 years [68][69][70]. This severe drought was associated with an unusual combination of factors.…”

Section: Drought Assessmentmentioning

confidence: 82%

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Extreme Drought Events over Brazil from 2011 to 2019

et al. 2019

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Drought-related disasters are among the natural disasters that are able to cause large economic and social losses. In recent years, droughts have affected different regions of Brazil, impacting water, food, and energy security. In this study, we used the Integrated Drought Index (IDI), which combines a meteorological-based drought index and remote sensing-based index, to assess the drought events from 2011 to 2019 over Brazil. During this period, drought events were observed throughout the country, being most severe and widespread between the years 2011 and 2017. In most of the country, the 2014/15 hydrological year stands out due to the higher occurrence of severe and moderate droughts. However, drought intensity and observed impacts were different for each region, which is shown by the different case studies, assessing different types of impacts caused by drought in Brazil. Thus, it is fundamental to evaluate the impacts of droughts in a continental country such as Brazil, where a variety of vegetation, soil, land use, and especially different climate regimes predominate.

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Section: Drought Assessmentmentioning

confidence: 82%

“…The 2015/2016 El Niño was one of the strongest on record, comparable to the 1982/1983 and 1997/1998 [73]. Although the large majority of severe drought events in the NEB is associated with the occurrence of El Niño, this is not always the case [70,74], as in the beginning of the multiyear drought in the NE.…”

Section: Drought Assessmentmentioning

confidence: 95%

Extreme Drought Events over Brazil from 2011 to 2019

et al. 2019

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“…The short-term is less than 6 months, while the long-term is greater than 6 months. According to previous studies, depending on the time scales, SPI can have some relation with the short-term surface moisture conditions associated with agricultural drought [44,45]. Park et al [15] showed that three-month SPI (hereafter referred to as SPI3) had the highest correlation with crop yield, and that oscillations of short-term drought can occur in association with the crop growth period [20].…”

Section: Meteorological Drought Indexmentioning

confidence: 99%

Different Agricultural Responses to Extreme Drought Events in Neighboring Counties of South and North Korea

et al. 2019

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Satellite-based remote sensing techniques have been widely used to monitor droughts spanning large areas. Various agricultural drought indices have been developed to assess the intensity of agricultural drought and to detect damaged crop areas. However, to better understand the responses of agricultural drought to meteorological drought, agricultural management practices should be taken into consideration. This study aims to evaluate the responses to drought under different forms of agricultural management for the extreme drought that occurred on the Korean Peninsula in 2014 and 2015. The 3-month standardized precipitation index (SPI3) and the 3-month vegetation health index (VHI3) were selected as a meteorological drought index and an agricultural drought index, respectively. VHI3, which comprises the 3-month temperature condition index (TCI3) and the 3-month vegetation condition index (VCI3), differed significantly in the study area during the extreme drought. VCI3 had a different response to the lack of precipitation in South and North Korea because it was affected by irrigation. However, the time series of TCI3 were similar in South and North Korea. These results meant that each drought index has different characteristics and should be utilized with caution. Our results are expected to help comprehend the responses of the agricultural drought index on meteorological drought depending on agricultural management.

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“…Precisase entender as diferenças entre os eventos extremos de tempo e de clima. Na região Nordeste do Brasil, o fenômeno climático que causa os maiores prejuízos à população, especialmente a do semiárido, é a seca, que varia em intensidade, magnitude e frequência (Cunha et al, 2015;Cunha et al, 2018;Marengo et al, 2018;Alvalá et al, 2017;. Eventos extremos de tempo estão relacionados à mudanças repentinas das condições meteorológicas em um dia, como enchentes causadas por fortes temporais , ou a um curto período de tempo, como ondas de calor ou frio (Geirinhas et al, 2017).…”

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Tendências em índices extremos de precipitação em Cabaceiras (PB) para períodos distintos

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Gomes

Silva

et al. 2020

Rev. Bras. Geog. Fis.

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Este trabalho teve como objetivo aplicar e estudar 11 índices de extremos de precipitação formulados pelo ETCCDI (Expert Team on Climate Change Detection and Indices, www.clivar.org/organization/etccdi), para a cidade de Cabaceiras-PB, utilizando dados diários de precipitação contínuos de 90 anos. Os índices foram calculados para o comprimento total da série, 1928 a 2017, assim como para três segmentos de 30 anos (1928-1957, 1958-1987 e 1988-2017). Os resultados evidenciaram que para muitos índices, tendências opostas e estatisticamente significativas podem ser observadas a depender do subperíodo estudado, assim como haver diferença entre estas tendências e as obtidas ao analisar-se o período total dos dados. Exemplos disso aconteceram para os índices R1mm, R10mm, R20mm, CWD e PRCPTOT. Trends in extreme precipitation indexes in Cabaceiras (PB) for different periods A B S T R A C TThis work aimed to apply and analyze 11 precipitation extremes indexes formulated by ETCCDI (Expert Team on Climate Change Detection and Indices, www.clivar.org/organization/etccdi), for the city of Cabaceiras, located in the Borborema mesoregion and microregion of Paraíba Oriental Cariri. A municipality in the semiarid region, it has the title of municipality where it rains less in Brazil, with an annual average of just over 300mm. Daily 90-year continuous precipitation data were used for the extreme indices, with the time series analyzed for four distinct periods, the total length of the series, 1928 to 2017, as well as three 30-year segments (1928-1957, 1958- 1987 and 1988-2017). The results showed that for many indices, opposite and significant trends can be observed depending on the sub period studied, as well as differences between these trends and those obtained by analyzing the total data period. The R1, R10 and R20mm indices show significant negative trends in the 1928-1957 sub period, but positive in the following two sub periods, reflecting a significant positive trend in the total period from 1928 to 2017. Other interesting examples are CDD indices for consecutive dry days, and PRCPTOT, for total annual rainfall with rainfall greater than 1mm. The CDD showed significant positive trend only in the 1928-1957 sub period, but non-significant negative trends in the subsequent sub periods, reflecting non-significant negative trends in the total length of the series. The PRCPTOT index shows behavior opposite to the CDD index, with a significant negative trend in the 1928-1957 sub period, positive in 1958-1987 and negative again in 1988-2017, but for the total length of the series the trend is positive and significant. These results show that the analysis of extreme trends is noticeably sensitive to the sample of the analyzed period, and may not reflect the reality of the time series the longer the total length of the time series, and need to be used with caution.Keywords: climate variability, dry and wet periods, semiarid.

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Changes in the spatial–temporal patterns of droughts in the Brazilian Northeast

Cited by 105 publications

References 35 publications

Extreme Drought Events over Brazil from 2011 to 2019

Extreme Drought Events over Brazil from 2011 to 2019

Different Agricultural Responses to Extreme Drought Events in Neighboring Counties of South and North Korea

Tendências em índices extremos de precipitação em Cabaceiras (PB) para períodos distintos

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