Banca de QUALIFICAÇÃO: IARA BEZERRA DA SILVA CAVALCANTE

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : IARA BEZERRA DA SILVA CAVALCANTE
DATE: 16/07/2021
TIME: 09:00
LOCAL: VIDEOCONFERÊNCIA
TITLE:

Analysis of spatial-temporal variability of precipitation in Maceió-AL and its climatic causes.

KEY WORDS:

Standardized Precipitation Index, ENOS, OndaletAnalysis.

PAGES: 81
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Meteorologia
SUMMARY:

The general objective of this work is to analyze spatially and temporally the
precipitations in Maceió, identifying areas with similar precipitations, and,
consequently, discovering the climatic cause for the occurrence of its variability.
Precipitation data from Maceió were used for 13 meteorological stations, with periods
from 2015 to 2020, obtained from the Municipal Civil Defense, with no failures in the
study period. Through spatialization, it was observed that the mean annual
Standardized Precipitation Index (SPI) values were classified as normal. However, the
upper part of the capital, to the north, and the North Coast of Maceió have lower
values that are closer to events classified as dry, unlike the lower part and South
Coast, which have SPI closer to rainy events. For the SPI mean, two regions (R1 and
R2) were identified, separated into groups by cluster analysis, which showed greater
Euclidean distance and less similarity. The BoxPlot graph presents similar values in
both the upper limit and the median for both regions (R1 and R2), in which the SPI of
the upper value for the two regions has a maximum value of approximately 2.99,
whereas the lower limit has a SPI close to to 1.1 for R1 and 1 for R2. In the Mann-
Kendall trend, trends of decreasing precipitation were identified in region 1, and a
slight increase in the trend of precipitation in region 2, both regions showed statistical
significance through the T-Student test. Using wavelet analysis, the following scales
were identified for region 1: seasonal, semiannual, interannual, ENOS, extended
ENSO, Sunspots and Atlantic Dipole, in which ENOS and extended ENSO presented
dominant scale, whereas for region 2, they were The following scales were identified:
seasonal, semiannual, interannual, ENSO, Sunspots and Atlantic Dipole, with ENSO
as the dominant scale.

BANKING MEMBERS:
Externa à Instituição - WERONICA MEIRA DE SOUZA
Interna - 1772619 - DJANE FONSECA DA SILVA
Interno - 1537309 - FABRICIO DANIEL DOS SANTOS SILVA