Gabriel Pita
A5077619463- Plant Water Relations and Carbon Dynamics
- Forest ecology and management
- Tree-ring climate responses
- Atmospheric and Environmental Gas Dynamics
- Aerodynamics and Acoustics in Jet Flows
- Climate variability and models
- Combustion and flame dynamics
- Fluid Dynamics and Turbulent Flows
- Calibration and Measurement Techniques
- Wind and Air Flow Studies
- Plant responses to elevated CO2
- Heat Transfer Mechanisms
- Soil erosion and sediment transport
- Aeolian processes and effects
- Soil Carbon and Nitrogen Dynamics
- Forest Biomass Utilization and Management
- Environmental and biological studies
- Greenhouse Technology and Climate Control
- Advanced Sensor Technologies Research
- Computational Fluid Dynamics and Aerodynamics
- Peatlands and Wetlands Ecology
- Radiative Heat Transfer Studies
- Tree Root and Stability Studies
- Hydrology and Drought Analysis
- Growth and nutrition in plants
University of Lisbon
1984-2021
Instituto Politécnico de Lisboa
2003-2020
Universidad Nacional de Entre Ríos
2017
University of Antwerp
2013
Instituto Superior Técnico
1984-2012
National Statistical Institute of Portugal
2010
Abstract Terrestrial ecosystems sequester 2.1 Pg of atmospheric carbon annually. A large amount the terrestrial sink is realized by forests. However, considerable uncertainties remain regarding fate this over both short and long timescales. Relevant data to address these are being collected at many sites around world, but syntheses still sparse. To facilitate future synthesis activities, we have assembled a comprehensive global database for forest ecosystems, which includes budget variables...
Abstract. Droughts reduce gross primary production (GPP) and ecosystem respiration (Reco), contributing to most of the inter-annual variability in terrestrial carbon sequestration. In seasonally dry climates (Mediterranean), droughts result from reductions annual rainfall changes rain seasonality. We compared fluxes measured by eddy covariance technique three contrasting ecosystems southern Portugal: an evergreen oak woodland (savannah-like) with ca.~21% tree crown cover, a grassland...
Abstract. We applied a site evaluation approach combining Lagrangian Stochastic footprint modeling with quality assessment for eddy-covariance data to 25 forested sites of the CarboEurope-IP network. The analysis addresses spatial representativeness flux measurements, instrumental effects on quality, patterns in and performance coordinate rotation method. Our findings demonstrate that application filter could strengthen database, since only one third is situated truly homogeneous terrain....
[1] Basal ecosystem respiration rate (BR), the at a given temperature, is common and important parameter in empirical models for quantifying (ER) globally. Numerous studies have indicated that BR varies space. However, many ER still use global constant largely due to lack of functional description BR. In this study, we redefined be mean annual temperature. To test validity concept, conducted synthesis analysis using 276 site-years eddy covariance data, from 79 research sites located...
Abstract. The impact of atmospheric reactive nitrogen (Nr) deposition on carbon (C) sequestration in soils and biomass unfertilized, natural, semi-natural forest ecosystems has been much debated. Many previous results this dC∕dN response were based changes stocks from periodical soil ecosystem inventories, associated with estimates Nr obtained large-scale chemical transport models. This study a companion paper (Flechard et al., 2020) strive to reduce uncertainties N effects C by linking...
The inter- and seasonal patterns of water vapor canopy carbon fluxes were compared for four forest ecosystems in two contrasting climatic zones Europe. eddy covariance ancillary data taken from the Carboeurope FLUXNET databases a linear modeling statistical analysis was made. sites high-density poplar (Populus spp.) short rotation coppice plantation (in Lochristi, Belgium) mature Scots pine (Pinus sylvestris) Brasschaat, Temperate climate versus fast-growing Eucalypt (Eucalyptus) Espirra,...
Abstract. Droughts cause reductions in gross primary production (GPP) and also net ecosystem exchange (NEE), contributing to most of the inter-annual variability terrestrial carbon sequestration. In seasonally dry climates (Mediterranean) droughts result from annual rainfall changes rain seasonality. western Iberia, hydrological-year (i.e., October September) 2004–2005 was extremely dry, with precipitation 50% below long-term mean (691 mm 1961–1990), but 2005–2006 normal. We compared fluxes...
Abstract Accurate predictions of net ecosystem productivity (NEP c ) forest ecosystems are essential for climate change decisions and requirements in the context national growth greenhouse gas inventories. However, drivers underlying mechanisms determining NEP (e.g., nutrients) not entirely understood yet, particularly when considering influence past periods. Here we explored explanatory power compensation day (cDOY) — defined as year winter carbon losses compensated by spring assimilation...
Abstract. We applied a site evaluation approach combining Lagrangian Stochastic footprint modelling with quality assessment for eddy-covariance data to 25 forested sites of the CarboEurope-IP network. The analysis addresses spatial representativeness flux measurements, instrumental effects on quality, patterns in and performance coordinate rotation method. Our findings demonstrate that application filter could strengthen database, since only one third is situated truly homogeneous terrain....
Passive control methods were used to suppress combustion instability in a combustor with bluff-body stabilizer. The instabilities this are excited by interaction between vortices shed downstream of the stabilizer and chamber acoustic modes. passive methodology was change geometrical design manner that will disrupt formation or reduce coherence wake vortices, thus eliminating source excitation. Two designs tested compared regular baseline disk first corrugated promotes shedding longitudinal...
This paper summarizes results between 2002 and 2010 from eddy covariance measurements of carbon uptake in the 12 month annual growing period eucalypt site Espirra Southern Portugal (38° 38’N, 8° 36’ W) . site, aimed for pulp production is part an intensively 300 ha coppice, with about 1100 trees ha–1. The climate Mediterranean type. During measurement (2002-2010) two main events changed sink pattern forest: a drought years (2004-2005) tree felling (November December 2006). Before felling,...
Abstract. The impact of atmospheric reactive nitrogen (Nr) deposition on carbon (C) sequestration in soils and biomass unfertilised, natural, semi-natural forest ecosystems has been much debated. Many previous results this dC / dN response were based changes stocks from periodical soil ecosystem inventories, associated with estimates Nr obtained large-scale chemical transport models. This study a companion paper (Flechard et al., 2019) strive to reduce uncertainties N effects C by linking...
Abstract. The main objective of this work was to report the recovery seasonal pattern GPP obtained by eddy covariance measurements in a eucalypt (Eucalyptus globulus Labill.) site Pegões (Southern Portugal) after felling processed October and November 2006. This made wider context general description evolution carbon sequestration at several timescales period 2002–2010. In Portugal stands aimed mainly for pulp production occupies an area about 739 515 ha, (National Forest Inv 2005–2006)...
<p>Este trabajo describe cómo la evaluación formativa fue introducida en un curso de matemáticas para futuros bioingenieros. Este cambio se desarrolló el contexto una indagación enmarcada los principios metodológicos Investigación Acción Participativa. Como resultado sistema tradicional basado exámenes parciales, evaluaciones finales y trabajos laboratorio reemplazado por nuevo que incorpora nuevas actividades enfatizando debate, retroalimentación participación estudiantes. En este...