Banca de DEFESA: PRISCILA DA SILVA BATISTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : PRISCILA DA SILVA BATISTA
DATA : 31/05/2019
HORA: 09:00
LOCAL: Sala 110 - Campus Amazônia
TÍTULO:

VALIDATION OF THE RAINFALL PRECIPITATION DATA ESTIMATED BY THE MERGE PRODUCT TO THE CENTRAL AMAZON

PALAVRAS-CHAVES:

Precipitation; MERGE; Amazon rainforest; State of Pará; Validation

PÁGINAS: 85
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

The Amazon is a vast biome, of continental dimensions, which still has areas of difficult access
that added to the local peculiarities, make difficult the installation and / or expansion of
networks of meteorological stations. An alternative that has been used for climatological and
hydrological research is the satellites or combined products of rainfall data estimated by
satellites and observed rainfall data such as the MERGE product. The MERGE product is the
combination of a new technique that aims to combine the TRMM satellite data with the highest
quality surface observation data on the continent of South America, however, the accuracy of
the data is questionable when compared to the data collected on surface. In view of MERGE's
potential contribution, it can be an extremely useful tool, the objective of this work was to
evaluate the quality of the data estimated by the MERGE for the Central Amazonia, based on
data observed on the surface for a period of 20 years (1998-2017). Six INMET meteorological
stations were used, with a failure rate of less than 1.70%, and the application of descriptive
statistics showed a strong similarity between the analyzed datasets, with Pearson's correlation
being higher than 0.89 and the lowest coefficient of determination was 0.79, both in Óbidos,
Belterra and Monte Alegre were the points that represented the data estimated with greater
precision for the study region. Regarding the quantitative measures of performance used in the
study, such as bias, coefficient of efficiency (EFF), Willmott's concordance index (d), mean
absolute error (EMA) and root mean square error (REMQ), the results were satisfactory,
however, there was an underestimation of the product at all points analyzed. In relation to the
interannual rainfall variability, it was observed an increase in the amount of precipitation in
Óbidos, from one decade to another (1998-2007 and 2008-2017), while in Porto de Moz there
was a decrease, although there was no trend of rainfall at any of the points analyzed at work. In
the analysis of the monthly variation of precipitation was used the Norm Climatological
published by INMET (1981-2010), which was well adjusted to the estimated data. Finally, the
seasonal analysis showed that the region presents a heterogeneous spatialization of precipitation
in relation to rainy (DJF and MAM) and dry (JJA and SON) quarters. Thus, the results showed
excellent data quality estimated by the MERGE for the Central Amazonia of Brazil, when
compared to the data observed and can be used as an alternative source of information on the
scarcity of surface station data.

MEMBROS DA BANCA:
Presidente - 2034627 - JULIO TOTA DA SILVA
Interno - 1739961 - MANOEL ROBERVAL PIMENTEL SANTOS
Externo ao Programa - 2195729 - RAONI AQUINO SILVA DE SANTANA
Externo ao Programa - 1392029 - ANTONIO MARCOS DELFINO DE ANDRADE