Banca de DEFESA: ISABELA PATRÍCIA DE ANDRADE FIGUEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ISABELA PATRÍCIA DE ANDRADE FIGUEIRA
DATE: 27/02/2026
TIME: 09:00
LOCAL: meet.google.com/kve-satg-ric
TITLE:

Spatiotemporal Variations of Heatwaves in the Pernambuco Semiarid: Creation of Impact Scenarios for Agriculture and Livestock

KEY WORDS:

Food Security; Reanalysis; Remote Sensing; Climate Anomaly.

PAGES: 108
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUMMARY:

The intensification of heatwaves constitutes one of the most critical challenges imposed by climate change on the Brazilian Semiarid, a region marked by high socio-environmental vulnerability and dependence on rainfed systems. This dissertation investigated the spatiotemporal dynamics of extreme heat events in the Pernambuco Semiarid region, from 1994 to 2023, and evaluated their impacts on primary productivity and agro-livestock security. The methodology was based on the integration of orbital remote sensing time series (Landsat 5, 8, and 9) and climate reanalysis (ERA5), processed in the cloud via Google Earth Engine. Heatwaves were statistically identified using relative thresholds (90th percentile) with a minimum persistence of three days. The results revealed a structural shift in the regional climate regime. A severe thermodynamic decoupling was identified, wherein Land Surface Temperature (LST) reaches peaks exceeding 48°C, while air temperature stabilizes at lower levels (~40°C). Trend analysis (Mann-Kendall) demonstrated that, unlike the atmosphere, which showed no statistically significant warming in the historical series, the surface exhibits a robust and accelerated warming trend (p < 0.01). This phenomenon indicates that the degradation of vegetation cover has transformed the soil into a sensible heat emitter, driving a process of "thermal aridification." In the biophysical scope, the research defined the "Scissors Effect," proving that soil warming above 36.8°C acts as a trigger for the collapse of vegetative vigor (EVI), penalizing productivity by approximately 25%. The agroclimatic risk assessment detected a critical "Phenological Trap" for common bean cultivation (Phaseolus vulgaris), classifying 67.9% of the territory as thermally unviable (>33°C) during extreme events. For dairy livestock, the predominance of high-risk areas (>32°C) in nearly 80% of the state imposes physical barriers to production. It is concluded that traditional climate monitoring underestimates the severity of extremes in the Semiarid region and that soil thermal security must be incorporated as a priority in drought adaptation strategies.

COMMITTEE MEMBERS:
Presidente - ***.186.984-** - ALDO TORRES SALES - UFPE
Externo à Instituição - ALEXANDRE HUGO CEZAR BARROS
Externo ao Programa - 1147000 - JOSE RALIUSON INACIO SILVA - null