4 documents found, page 1 of 1
Understanding nighttime methane signals at the Amazon Tall Tower Observatory (A...
Botía, Santiago; Gerbig, Christoph; Marshall, Julia; Lavric, J. V.; Walter, David; Pöhlker, Christopher; A Holanda, Bruna; Fisch, Gilberto FernandoMethane (CH4) atmospheric mixing ratio measurements are analyzed for the period between June 2013 and November 2018 at the Amazon Tall Tower Observatory (ATTO). We describe the seasonal and diurnal patterns of nighttime events in which CH4 mixing ratios at the uppermost (79ma.g.l.) inlet are significantly higher than the lowermost inlet (4ma.g.l.) by 8ppb or more. These nighttime events were found to be associa...
Nighttime wind and scalar variability within and above an Amazonian canopy
Oliveira, Pablo E.S.; Acevedo, Otávio C.; Sörgel, Matthias; Tsokankunku, Anywhere; Wolff, Stefan; Araüjo, Alessandro Carioca deNocturnal turbulent kinetic energy (TKE) and fluxes of energy, CO2 and O3 between the Amazon forest and the atmosphere are evaluated for a 20-day campaign at the Amazon Tall Tower Observatory (ATTO) site. The distinction of these quantities between fully turbulent (weakly stable) and intermittent (very stable) nights is discussed. Spectral analysis indicates that low-frequency, nonturbulent fluctuations are res...
Strong sesquiterpene emissions from Amazonian soils
Bourtsoukidis, Efstratios; Behrendt, Thomas; Yáñez-Serrano, Ana Maria; Hel?en, Heidi; Diamantopoulos, Efstathios; Catão, Elisa Caldeira PiresThe Amazon rainforest is the world's largest source of reactive volatile isoprenoids to the atmosphere. It is generally assumed that these emissions are products of photosynthetically driven secondary metabolism and released from the rainforest canopy from where they influence the oxidative capacity of the atmosphere. However, recent measurements indicate that further sources of volatiles are present. Here we s...
Monoterpene chemical speciation in a tropical rainforest:variation with season,...
Yáñez-Serrano, Ana Maria; Nölscher, Anke C.; Bourtsoukidis, Efstratios; Alves, Eliane Gomes; Ganzeveld, Laurens N.; Bonn, Boris; Wolff, StefanSpeciated monoterpene measurements in rainforest air are scarce, but they are essential for understanding the contribution of these compounds to the overall reactivity of volatile organic compound (VOC) emissions towards the main atmospheric oxidants, such as hydroxyl radicals (OH), ozone (O3) and nitrate radicals (NO3). In this study, we present the chemical speciation of gas-phase monoterpenes measured in the...