Banca de DEFESA: SARAH SUELY ALVES BATALHA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : SARAH SUELY ALVES BATALHA
DATA : 31/01/2019
HORA: 14:00
LOCAL: Auditório NTB
TÍTULO:

Study about concentration and flow of biogenic volatile organic compounds in an oldgrowth forest at Tapajos National Forest

PALAVRAS-CHAVES:

Amazon. Atmospheric chemistry. VOC. BVOC. Hydrocarbons. Eddy Covariance.

PÁGINAS: 93
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

It is estimated that 90% of the annual emission of Biogenic Volatile Organic Compounds
(BCOVs) into the atmosphere is of biogenic origin. BVOCs play as a "fuel" that keeps oxidative
photochemistry in operation in the atmospheric processes. Recent studies about atmospheric
chemistry in tropical forests show that the characterization of organic compounds is challenged
by the difficulties of measurements and analyzes. This is due to the difficulties in implementing
research logistics at the center of forests as well as the high variability and reactivity of organic
gases and organic particles emitted by vegetation to the atmosphere. Thus, our aim was to
measure the concentration and flows of BVOCs in an old-growth forest in the Tapajos National
Forest in real time. The study area is in the research site of km 67 of the Cuiabá-Santarém
Highway. The campaign took place in June 2014, corresponding to the transition period between
the two predominant seasons in the region: rainy and dry. The mixing ratio and Eddy Covariance
(EC) methods were applied. To these measurements, for the first time in an Amazon rainforest,
a proton-transfer-time-of-flight mass analyzer (PTR-TOF-MS) was runned, which, due its high
resolution, has been able to identify compounds in the atmosphere at the pptv level, as well as it
can to separate isobaric ions. We identified 51 carbon compounds in the protonated ion mass
range from 33.034 to 137.132. The focus on the turbulence analyzes were isoprene (mass 69)
and monoterpenes (mass 137) terpenoids, because they are predominant compounds of the plant
metabolism. The daily concentration averages were 1.4 ppbv of isoprene and 0.18 ppbv of
monoterpenes, with maximums of 4.1 ppbv of isoprene and 0.55 ppbv of monoterpenes. There
was a significant emission of monoterpenes in relation to the proportion of isoprene, with a
maximum of 1.4959 mg.m-2.h-1, which corresponded to one-third of the isoprene emission (4.384
mg.m-2.h-1). The most significant meteorological variables for the emission of BVOCs were
temperature, sensible heat flux and wind friction velocity. Thus, the data presented in this
research for the study region expressed the importance of the turbulent flow as a determining
factor for the Biosphere-Atmosphere interaction.

MEMBROS DA BANCA:
Presidente - 2034627 - JULIO TOTA DA SILVA
Interno - 1794276 - JOSE MAURO SOUSA DE MOURA
Interno - 152.758.687-15 - LAURO EUCLIDES SOARES BARATA - UFOPA
Interno - 1739961 - MANOEL ROBERVAL PIMENTEL SANTOS
Externo ao Programa - 2375623 - GABRIELA BIANCHI DOS SANTOS
Externo ao Programa - 2142681 - BRUNO APOLO MIRANDA FIGUEIRA
Externo ao Programa - 1217126 - ROSA HELENA VERAS MOURAO