Change in number of rainy days in the municipality of Visconde de Mauá, Rio de Janeiro
DOI:
https://doi.org/10.20873/jbb.uft.cemaf.v8n4.bunhakKeywords:
south fluminense, change climate, student's t test, tendAbstract
Climate change has the potential to change the distribution of rainfall. However, for Sul Fluminense this analysis was not performed. Thus, the objective of this research was to identify changes in the number of rainy days in the South Fluminense region. Daily rainfall data from 1938-2011 were used for the study from a weather station located in the municipality of Visconde de Mauá-RJ. The rain data were divided into five classes of days with rain equal to: P = 0; 0 < P ≤ 5; 5 > P ≤ 10; 10 > P ≤ 15; 15 > P ≤ 20. The analysis was performed using the rain data for the months of January (summer) and July (winter). The rain classes were submitted to Student's t test for the linear regression slope to identify possible changes in rainfall classes. For this test, a significance level of 5% was adopted. The analysis showed that the classes 5 > P ≤ 10; 10 > P ≤ 15; 15 > P ≤ 20 for the month of January, showed a reduction, but there was no statistical significance for the test applied. For January only classes 0 < P ≤ 5 showed an increase which statistically significant. In July there was an increase in classes 5 > P ≤ 10 and 10 > P ≤ 15 and reduction in 0 <P ≤ 5 and 15> P ≤ 20. However, without statistical significance for July. Results show greater reduction the rainfall in January.
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