Tendências da precipitação diária no estado de São Paulo a partir do Índice de Concentração (IC)

Rampazo, Núria Aparecida Miatto; Nunes, Lucí Hidalgo

doi:10.20396/sbgfa.v1i2017.2312

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“…Sant 'anna Neto (1997) evaluated rainfall data for the state between 1941 and 1993 and concluded that both positive and negative rainfall extremes showed increasing amplitudes, especially in the west. Rampazo & Nunes (2017) evaluated daily precipitation for the period between 1959 and 2013 and noted that distribution is more heterogeneous in locations of lower rainfall rates (north and west of the state of São Paulo), since the precipitation in these regions tends to be more concentrated, with few days presenting high volume. In a study for a few Brazilian states evaluating two datasets with more than 70 years of data, Zilli et al (2016) found an increase in the frequency of rainy days and extreme daily precipitation only in the state of São Paulo.…”

Section: Analysis Of Extreme Eventsmentioning

confidence: 99%

More Erratic and More Extreme: Trends in Precipitation in the State of S&#227;o Paulo, Brazil

Nunes¹,

Gabriel²,

Marengo³

2023

AJCC

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The study assessed changes in rainfall variability and the frequency of extreme events (very wet and very dry) in the state of São Paulo, Brazil, for a 40-year period that divided into two sub-groups: 1973-1992 (P1) and 1993-2012 (P2). Data of 79 rain gauge stations were selected to represent the different climatic and geomorphological domains of the state. The annual pattern was evaluated through the scale and the shape parameters of the gamma distribution and the 95th and the 5th percentiles thresholds, the latter also employed to evaluate the seasonal spatial patterns (rainy season, Oct.-Mar. and sub-humid to dry season, Apr.-Sep.). Results showed that the average precipitation was similar in P1 and P2, but São Paulo evolved to a pattern of increased irregularity in the rainfall distribution, with a rise of approximately 10% in the number of extremes between 1973 and 2012, especially in the very dry occurrences, and in the north and west of the state, which are the least rainy regions. Moreover, while 55% of the evaluated rain gauges recorded more extreme wet episodes in P2, 76% registered more dry extreme episodes in the same period. Some very dry or very wet events recorded after the 40-year period evaluated were discussed in terms of the associated weather patterns and their impacts on society and attested to the validity of the results found in the quantitative assessment. The qualitative analysis indicates that if the trends of more irregular distribution of rain and increase in extreme events persist, as pointed out by the gamma and percentile analyses, they would continue to bring serious effects on the natural and social systems in the state, which is the most populous and has the strongest and most diversified economy in Brazil.

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Section: Analysis Of Extreme Eventsmentioning

confidence: 99%

More Erratic and More Extreme: Trends in Precipitation in the State of S&#227;o Paulo, Brazil

Nunes¹,

Gabriel²,

Marengo³

2023

AJCC

Self Cite

View full text Add to dashboard Cite

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Tendências da precipitação diária no estado de São Paulo a partir do Índice de Concentração (IC)

Cited by 1 publication

References 4 publications

More Erratic and More Extreme: Trends in Precipitation in the State of S&#227;o Paulo, Brazil

More Erratic and More Extreme: Trends in Precipitation in the State of S&#227;o Paulo, Brazil

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Tendências da precipitação diária no estado de São Paulo a partir do Índice de Concentração (IC)

Cited by 1 publication

References 4 publications

More Erratic and More Extreme: Trends in Precipitation in the State of S&amp;#227;o Paulo, Brazil

More Erratic and More Extreme: Trends in Precipitation in the State of S&amp;#227;o Paulo, Brazil

Contact Info

Product

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More Erratic and More Extreme: Trends in Precipitation in the State of São Paulo, Brazil

More Erratic and More Extreme: Trends in Precipitation in the State of São Paulo, Brazil