12 documents found, page 1 of 2
Stability and turbulence structure under the influence of the nocturnal low lev...
Santana, Raoni Aquino Silva da; Tóta, Júlio; dos Santos, Rosa Maria Nascimento; Vale, Roseilson Santos doThe aim of this study was to evaluate how the occurrence of nocturnal Low Level Jets (LLJs) may influence the atmospheric turbulence structure and atmospheric stability at the surface. Using data collected from both radiosondes and Eddy Covariance Systems during the WetAMC-LBA campaign, three atmospheric stability regimes were defined at the surface: weakly stable; transition, and very stable. Relating these re...
The Amazon Tall Tower Observatory (ATTO): Overview of pilot measurements on eco...
Andreae, Meinrat O.; Acevedo, Otávio C.; Araüjo, Alessandro Carioca de; Artaxo, Paulo; Barbosa, Cybelli G.G.; Barbosa, H. M. J.; Brito, Joel F.The Amazon Basin plays key roles in the carbon and water cycles, climate change, atmospheric chemistry, and biodiversity. It has already been changed significantly by human activities, and more pervasive change is expected to occur in the coming decades. It is therefore essential to establish long-term measurement sites that provide a baseline record of present-day climatic, biogeochemical, and atmospheric cond...
Hydroclimatic variables associated with El Nino and La Nina events at the Curuá...
Vale, Roseilson Souza do; Gomes, Ana Carla dos Santos; Santana, Raoni Aquino Silva de; Tóta, Júlio; Miller, Scott DennisThe anomalies of Sea Surface Temperature (SST) influence rainfall and therefore the regime of the rise and fall in the level of the rivers in the Amazon region. The aim of this study was to investigate the influence of the El Nino-Southern Oscillation (ENSO) on hydroclimatic variables and identify the existence of trends on these variables in the Curuá-Una hydroelectric reservoir in the West of the State of Par...
Linking meteorology, turbulence, and air chemistry in the amazon rain forest
Fuentes, José D.; Chamecki, Marcelo; dos Santos, Rosa Maria Nascimento; Von Randow, Celso; Stoy, Paul C.; Katul, Gabriel George; Fitzjarrald, David RoyA field campaign reveals that the Amazon rain forest produces enough chemical species to undergo oxidation and generate aerosols, which can activate into cloud condensation nuclei and potentially influence cloud formation. © 2016 American Meteorological Society.
Leaf phenology as one important driver of seasonal changes in isoprene emission...
Alves, Eliane Gomes; Tóta, Júlio; Turnipseed, Andrew A.; Guenther, Alex B.; Vega Bustillos, José Oscar W.; Santana, Raoni Aquino Silva deIsoprene fluxes vary seasonally with changes in environmental factors (e.g., solar radiation and temperature) and biological factors (e.g., leaf phenology). However, our understanding of the seasonal patterns of isoprene fluxes and the associated mechanistic controls is still limited, especially in Amazonian evergreen forests. In this paper, we aim to connect intensive, field-based measurements of canopy isopre...
Seasonality of isoprenoid emissions from a primary rainforest in central Amazonia
Alves, Eliane Gomes; Jardine, Kolby J.; Tóta, Júlio; Jardine, Angela B.; Yáñez-Serrano, Ana Maria; Karl, Thomas G.; Tavares, Julia ValentimTropical rainforests are an important source of isoprenoid and other volatile organic compound (VOC) emissions to the atmosphere. The seasonal variation of these compounds is however still poorly understood. In this study, vertical profiles of mixing ratios of isoprene, total monoterpenes and total sesquiterpenes, were measured within and above the canopy, in a primary rainforest in central Amazonia, using a pr...
Observations of Manaus urban plume evolution and interaction with biogenic emis...
Cirino, Glauber G.; Brito, Joel F.; Barbosa, H. M. J.; Rizzo, Luciana Varanda; Tunved, Peter; Sá, Suzane S. de; Ji?enez, José Luis; Palm, Brett B.As part of the Observations and Modeling of the Green Ocean Amazon (GoAmazon 2014/5) Experiment, detailed aerosol and trace gas measurements were conducted near Manaus, a metropolis located in the central Amazon Basin. Measurements of aerosol particles and trace gases were done downwind Manaus at the sites T2 (Tiwa Hotel) and T3 (Manacapuru), at a distance of 8 and 70 km from Manaus, respectively. Based on in-p...
Airborne observations reveal elevational gradient in tropical forest isoprene e...
Gu, Dasa; Guenther, Alex B.; Shilling, John E.; Yu, Haofei; Huang, Maoyi; Zhao, Chun; Yang, Qing; Martin, Scot T.; Artaxo, Paulo; Kim, SaewungIsoprene dominates global non-methane volatile organic compound emissions, and impacts tropospheric chemistry by influencing oxidants and aerosols. Isoprene emission rates vary over several orders of magnitude for different plants, and characterizing this immense biological chemodiversity is a challenge for estimating isoprene emission from tropical forests. Here we present the isoprene emission estimates from ...
An overview of the Amazonian Aerosol Characterization Experiment 2008 (AMAZE-08)
Martin, Scot T.; Andreae, Meinrat O.; Althausen, Dietrich; Artaxo, Paulo; Baars, Holger; Borrmann, Stephan H.; Chen, Qi; Farmer, Delphine K.The Amazon Basin provides an excellent environment for studying the sources, transformations, and properties of natural aerosol particles and the resulting links between biological processes and climate. With this framework in mind, the Amazonian Aerosol Characterization Experiment (AMAZE-08), carried out from 7 February to 14 March 2008 during the wet season in the central Amazon Basin, sought to understand th...
CO2 concentration and flux in hydroelectric reservoir of Balbina (AM)
Vale, Roseilson Souza do; Santana, Raoni Aquino Silva de; Tóta, Júlio; Miller, Scott Dennis; Souza, Rodrigo; Branches, Rardiles; Lima, NewtonThe reservoir Balbina (59º 28’ 50w, 1º 53’ 25” S), located near the city of Manaus, Amazonas, in Central Amazônia, Brazil, is the second largest hydroelectric reservoir in an area located in the Amazon Basin. In this reservoir, CO2 measurements were performed at high frequency (10 Hz), CO2 flux with gas analyzer infrared (IRGA) coupled to a floating chamber and meteorological variables with a buoy instrumented ...