Banca de DEFESA: MARIA JOSE DA SILVA LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARIA JOSE DA SILVA LIMA
DATE: 13/05/2022
TIME: 08:30
LOCAL: Videoconferência
TITLE:

ANALYSIS OF CLIMATE CAUSES ON THE NUCLEI OF
BRAZILIAN DESERTIFICATION

KEY WORDS:

ENOS, Northeast, Cross Wave

PAGES: 74
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Meteorologia
SUMMARY:

Desertification is a process of degrading soil modifications, leading to
desert aspects, as a result of climatic variations and anthropic activities.
This study has the general objective to study the possible climatic causes that
influence the desertification process in the existing desertification nuclei in the
Brazil. Precipitation and temperature data from the cities that make up the
the Desertification Nuclei in Brazil, coming from the National Water Agency, the
National Institute of Meteorology and Ceará Foundation for Meteorology and Resources
Water for the period 1981 to 2020 for Irauçuba, 1961 to 2019 for Cabrobó, 1971
to 2019 for Gilbués and 1989 to 2019 for Seridó. We also used data from
Atlantic Dipole, Southern Oscillation Index, Pacific Interdecadal Oscillation,
Pacific Decennial Oscillation and Atlantic Multidecennial Oscillation obtained from Earth
System Research Laboratory/National Oceanic and Atmospheric Administration.
It was observed that the frequency of dry years was higher than that of wet years, according to
the IAC in Irauçuba, the year 2000 became a turning point in the distribution of
local rainfall. For Cabrobó and Seridó, the IAC recorded more occurrences of years
wet years than dry years, however, dry events were more frequent and
were more intense, and in some of these years there was the performance of the
El Niño phenomenon. In the center of Gilbués the dry and wet years occurred
practically in the same proportion. Decreasing trends were detected in the
core precipitation indicating that rainfall has decreased over time,
while in the temperature series an increasing trend was pointed out. The analyses
of Ondaleta showed influence of different time scales on the series of
precipitation and core temperature, and these scales are responsible for increases
anomalous in the series, when acting simultaneously. The time scales that most
influence the Irauçuba precipitation series are: the seasonal scale, the scale from 4 to 8
years, the 11-year scale. Cabrobó was influenced by the seasonal scale, the scale of 2 to 4 years,
the 11-year scale. The Seridó precipitation series is influenced by the seasonal scale, from 2 to
4 years and 7 years. The presence of the seasonal scale was observed in the precipitation series
of Gilbués, the time scale of 2 to 4 years, coinciding with the period of operation of the
scale of 11 and the scale of 16 years. The crossed Wavelet showed interrelationships between the
precipitation series of the nuclei and the series of climatic indices of the scales
dominants of each nucleus. The maximum precipitation in the Irauçuba core occurs 3
years before the maximum occurrence of the Atlantic Dipole. For Cabrobó, the maximum
Precipitation occurs 27 to 54 months before the Atlantic Dipole maximum. In
Seridó the maximum precipitation occurs 33 months after the maximum of the IOS. For
Gilbués, the coherence suggests that the maximum peak of precipitation in the locality occurs 72
months before the Atlantic Dipole maximum.

BANKING MEMBERS:
Presidente - 1772619 - DJANE FONSECA DA SILVA
Externo ao Programa - 1292888 - JORIO BEZERRA CABRAL JUNIOR
Interna - 1653612 - MARIA LUCIENE DIAS DE MELO