Banca de DEFESA: THAINNE EVE RIBEIRO LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : THAINNE EVE RIBEIRO LIMA
DATE: 05/08/2021
TIME: 14:00
LOCAL: meet.google.com/far-hhfs-pif
TITLE:

THE SPACE-TEMPORAL DISTRIBUTION OF AIR TEMPERATURE, PRECIPITATION AND PALMER DROUGHT SEVERITY INDEX (PDSI) IN THE CERRADO BIOME BETWEEN 1958 AND 2019ABSTRACT

KEY WORDS:

climatological analysis; tendency; seasonality; variability; phytogeography.

PAGES: 103
BIG AREA: Ciências Humanas
AREA: Geografia
SUMMARY:

The Cerrado Biome, one of the “hotspots” for the conservation of the world's biodiversity, is the second largest biogeographic region in South America and the second largest biome in Brazil, occupying about 24% of its territory. Due to its vast territorial extension, the Cerrado has a great diversity of plant formations and endemic species, being considered the richest “savanna” in the world. Despite its recognized importance, the fragmentation of natural habitats and the conversion of Cerrado land for agricultural purposes threaten the maintenance of the biome's biodiversity. Deforestation in the Cerrado exceeds deforestation rates in the Amazon rainforest by 1.8 times. Unrestrained deforestation and intense urbanization have resulted in significant changes in rainfall and air temperature patterns in the region. From this, the objective of this study was to present the trends, seasonality and variability in monthly and annual scales of climate variables in the Cerrado between the years 1958 and 2019, in order to understand the climatic characteristics of the biome. For this, monthly data on precipitation, air temperature and the Palmer drought index (PDSI) were used, provided by the TerraClimate database. For the analysis, it was decided to divide the historical series into seven periods, in order to compare the average of each one with the average of the historical series and, thus, understand the behavior of the variables over the years. Thus, the data were extracted, processed and analyzed previously in the Grid Analysis and Display System (GraDs) software. Then, they were tabulated and received statistical treatment in Microsoft Excel, so that the abrupt changes, the trend and the seasonality of the climatic variables were estimated by the BEAST method (Bayesian Estimator of Abrupt chance, Seasonal chance, and Trend). With the analysis of the results, it was found that the average rainfall increases in the east-west direction, presenting a significant spatial difference, being more expressive in the states that make transition with the Amazon Forest. In addition, it was identified that air temperatures have a relative increase trend in the south-north direction of the biome, with the lowest temperatures occurring from the extreme southeast to the central portion of the biome, while the highest averages occur in the North, with similar patterns found in the analysis of the drought index. In addition, it was found that changes in climate trends are more accentuated than seasonality. Furthermore, the study corroborated previous research on the presence of two well-defined seasons in the Cerrado, a hot and rainy season, starting in October and extending into April, and a cold and dry season between May and September. The results of this study show the importance of understanding the dynamics of climatic variables in the Cerrado and constitute a source of consultation on the climatology of this biome.

BANKING MEMBERS:
Presidente - 2001758 - GABRIEL PEREIRA
Interna - 007.170.909-65 - FRANCIELLE DA SILVA CARDOZO - UFSJ
Externa à Instituição - MARIA ELISA SIQUEIRA SILVA - USP
Externo à Instituição - GUILHERME AUGUSTO VEROLA MATAVELI - INPE