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Your search keyword '"Trissevgeni Stavrakou"' showing total 2 results
Start Over Author "Trissevgeni Stavrakou" Journal global change biology
2 results on '"Trissevgeni Stavrakou"'

1. Amazonian biogenic volatile organic compounds under global change

Author

Joan Llusià, Ana Maria Yáñez-Serrano, Jonathan Williams, Eliane G. Alves, J. Kesselmeier, Paulo Artaxo, Josep Peñuelas, Katerina Sindelarova, Jana Doubalova, Trissevgeni Stavrakou, Efstratios Bourtsoukidis, Iolanda Filella, Alex Guenther, and Maite Bauwens

Subjects
0106 biological sciences, Land cover, 010504 meteorology & atmospheric sciences, Climate Change, Climate, Amazonian, Climate change, Forests, Atmospheric sciences, 010603 evolutionary biology, 01 natural sciences, Amazonia, Deforestation, Forest ecology, Environmental Chemistry, Ecosystem, Global change, Ecological interactions, 0105 earth and related environmental sciences, General Environmental Science, Biogenic volatile organic compounds, Volatile Organic Compounds, Global and Planetary Change, Biomass (ecology), Ecology, Depositional processes, 15. Life on land, Air chemistry, 13. Climate action, Atmospheric chemistry, Land use, Environmental science, Seasons, AEROSSOL
Abstract

Biogenic volatile organic compounds (BVOCs) play important roles at cellular, foliar, ecosystem and atmospheric levels. The Amazonian rainforest represents one of the major global sources of BVOCs, so its study is essential for understanding BVOC dynamics. It also provides insights into the role of such large and biodiverse forest ecosystem in regional and global atmospheric chemistry and climate. We review the current information on Amazonian BVOCs and identify future research priorities exploring biogenic emissions and drivers, ecological interactions, atmospheric impacts, depositional processes and modifications to BVOC dynamics due to changes in climate and land cover. A feedback loop between Amazonian BVOCs and the trends of climate and land-use changes in Amazonia is then constructed. Satellite observations and model simulation time series demonstrate the validity of the proposed loop showing a combined effect of climate change and deforestation on BVOC emission in Amazonia. A decreasing trend of isoprene during the wet season, most likely due to forest biomass loss, and an increasing trend of the sesquiterpene to isoprene ratio during the dry season suggest increasing temperature stress-induced emissions due to climate change.

Published
2020
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2. Vegetation responses to climate extremes recorded by remotely sensed atmospheric formaldehyde

Author

Pierre Friedlingstein, Iain Colin Prentice, Isabelle De Smedt, Pierre Regnier, Jean-François Müller, Maite Bauwens, Catherine Morfopoulos, Trissevgeni Stavrakou, Imperial College London, Université libre de Bruxelles (ULB), Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), University of Exeter, Macquarie University, Tsinghua University [Beijing] (THU), Argumentation, Décision, Raisonnement, Incertitude et Apprentissage (IRIT-ADRIA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, PRODEX TROVA of the European Space Agency and ALBERI (SR/00/373) funded by the Belgian Science Policy Office (2016–2019), OCTAVE (BR/175/A2/OCTAVE) of the Belgian Research Action through Interdisciplinary Networks (BRAIN-be) research programme (2017–2021), FP7 QA4ECV project (grant agreement no: 607405), BELSPO through the project ‘Global impacts of hydrological and climatic extremes on vegetation’ (SAT-EX, SR/00/306), which is part of the Belgian research programme for Earth Observation Stereo III. I.C.P., European Project: 787203,REALM, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Toulouse Mind & Brain Institut (TMBI), Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), European Project: 787203,H2020-EU.1.1.,H2020-EU.1.1.,REALM(2018), and Commission of the European Communities

Subjects
DYNAMICS, 0106 biological sciences, FLUXES, 010504 meteorology & atmospheric sciences, [SDE.MCG]Environmental Sciences/Global Changes, Climate, Biodiversity & Conservation, 05 Environmental Sciences, Formaldehyde, Environmental Sciences & Ecology, Forests, atmospheric remote sensing, Photosynthesis, Atmospheric sciences, 01 natural sciences, Troposphere, stress, chemistry.chemical_compound, RETRIEVALS, AEROSOLS, vegetation, Vegetation stress, Environmental Chemistry, TEMPERATURE, DROUGHT, climate extremes, 0105 earth and related environmental sciences, General Environmental Science, Global and Planetary Change, Volatile Organic Compounds, Science & Technology, ISOPRENE EMISSION, photosynthesis, Ecology, Water stress, Vegetation, 06 Biological Sciences, 15. Life on land, Droughts, MODEL, chemistry, 13. Climate action, Biodiversity Conservation, Environmental science, Life Sciences & Biomedicine, Climate extremes, Environmental Sciences, 010606 plant biology & botany
Abstract

Accurate monitoring of vegetation stress is required for better modelling and forecasting of primary production, in a world where heatwaves and droughts are expected to become increasingly prevalent. Variability in formaldehyde (HCHO) concentrations in the troposphere is dominated by local emissions of short-lived biogenic (BVOC) and pyrogenic volatile organic compounds. BVOCs are emitted by plants in a rapid protective response to abiotic stress, mediated by the energetic status of leaves (the excess of reducing power when photosynthetic light and dark reactions are decoupled, as occurs when stomata close in response to water stress). Emissions also increase exponentially with leaf temperature. New analytical methods for the detection of spatiotemporally contiguous extremes in remote-sensing data are applied here to satellite-derived atmospheric HCHO columns. BVOC emissions are shown to play a central role in the formation of the largest positive HCHO anomalies. Although vegetation stress can be captured by various remotely sensed quantities, spaceborne HCHO emerges as the most consistent recorder of vegetation responses to the largest climate extremes, especially in forested regions.

Published
2021
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