Journal ArticleDOI
Net carbon dioxide losses of northern ecosystems in response to autumn warming
Shilong Piao,Philippe Ciais,Pierre Friedlingstein,Philippe Peylin,Markus Reichstein,Sebastiaan Luyssaert,Hank A. Margolis,Jingyun Fang,Alan Barr,Anping Chen,Achim Grelle,David Y. Hollinger,Tuomas Laurila,Anders Lindroth,Andrew D. Richardson,Timo Vesala +15 more
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TLDR
Simulation and observations indicate that northern terrestrial ecosystems may currently lose carbon dioxide in response to autumn warming, with a sensitivity of about 0.2 PgC °C-1, offsetting 90% of the increased carbon dioxide uptake during spring.Abstract:
The carbon balance of terrestrial ecosystems is particularly sensitive to climatic changes in autumn and spring(1-4), with spring and autumn temperatures over northern latitudes having risen by about 1.1 degrees C and 0.8 degrees C, respectively, over the past two decades(5). A simultaneous greening trend has also been observed, characterized by a longer growing season and greater photosynthetic activity(6,7). These observations have led to speculation that spring and autumn warming could enhance carbon sequestration and extend the period of net carbon uptake in the future(8). Here we analyse interannual variations in atmospheric carbon dioxide concentration data and ecosystem carbon dioxide fluxes. We find that atmospheric records from the past 20 years show a trend towards an earlier autumn- to- winter carbon dioxide build- up, suggesting a shorter net carbon uptake period. This trend cannot be explained by changes in atmospheric transport alone and, together with the ecosystem flux data, suggest increasing carbon losses in autumn. We use a process- based terrestrial biosphere model and satellite vegetation greenness index observations to investigate further the observed seasonal response of northern ecosystems to autumnal warming. We find that both photosynthesis and respiration increase during autumn warming, but the increase in respiration is greater. In contrast, warming increases photosynthesis more than respiration in spring. Our simulations and observations indicate that northern terrestrial ecosystems may currently lose carbon dioxide in response to autumn warming, with a sensitivity of about 0.2 PgC degrees C-1, offsetting 90% of the increased carbon dioxide uptake during spring. If future autumn warming occurs at a faster rate than in spring, the ability of northern ecosystems to sequester carbon may be diminished earlier than previously suggested(9,10).read more
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Drought-Induced Reduction in Global Terrestrial Net Primary Production from 2000 Through 2009
Maosheng Zhao,Steven W. Running +1 more
TL;DR: Satellite data used to estimate global terrestrial NPP over the past decade found that the earlier trend has been reversed and that NPP has been decreasing, and combined with climate change data suggests that large-scale droughts are responsible for the decline.
Drought-Induced Reduction in Global Terrestrial Net Primary Production from 2000 Through 2009
Maosheng Zhao,Steven W. Running +1 more
TL;DR: In this article, the authors suggest a reduction in the global NPP of 0.55 petagrams of carbon, which would not only weaken the terrestrial carbon sink, but would also intensify future competition between food demand and biofuel production.
Journal ArticleDOI
Climate change, phenology, and phenological control of vegetation feedbacks to the climate system
Andrew D. Richardson,Trevor F. Keenan,Mirco Migliavacca,Youngryel Ryu,Youngryel Ryu,Oliver Sonnentag,Oliver Sonnentag,Michael Toomey +7 more
TL;DR: In this paper, the authors discuss the environmental drivers of phenology, and the impacts of climate change on phenology in different biomes, and assess the potential impact on these feedbacks of shifts in phenology driven by climate change.
Journal ArticleDOI
Photosynthesis under stressful environments: An overview
Muhammad Ashraf,Philip Harris +1 more
TL;DR: Progress made during the last two decades in producing transgenic lines of different C3 crops with enhanced photosynthetic performance is discussed, which was reached by either the overexpression of C3 enzymes or transcription factors or the incorporation of genes encoding C4 enzymes into C3 plants.
Journal ArticleDOI
Reduction of forest soil respiration in response to nitrogen deposition
Ivan A. Janssens,Wouter Dieleman,Sebastiaan Luyssaert,Jens-Arne Subke,Markus Reichstein,Reinhart Ceulemans,Philippe Ciais,A. J. Dolman,John Grace,Giorgio Matteucci,Dario Papale,Shilong Piao,Ernst Detlef Schulze,Jianwu Tang,Beverly E. Law +14 more
TL;DR: A meta-analysis suggests that nitrogen deposition impedes organic matter decomposition, and thus stimulates carbon sequestration, in temperate forest soils where nitrogen is not limiting microbial growth as mentioned in this paper, and the concomitant reduction in soil carbon emissions is substantial, and equivalent in magnitude to the amount of carbon taken up by trees owing to nitrogen fertilization.
References
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Journal ArticleDOI
Climate Change 2007: The Physical Science Basis Summary for Policymakers:
Journal ArticleDOI
An improved method of constructing a database of monthly climate observations and associated high-resolution grids
Timothy D. Mitchell,Philip Jones +1 more
TL;DR: In this paper, a database of monthly climate observations from meteorological stations is constructed and checked for inhomogeneities in the station records using an automated method that refines previous methods by using incomplete and partially overlapping records and by detecting inhomalities with opposite signs in different seasons.
Journal ArticleDOI
Europe-wide reduction in primary productivity caused by the heat and drought in 2003
Philippe Ciais,Markus Reichstein,Nicolas Viovy,A. Granier,Jérôme Ogée,Vincent Allard,M. Aubinet,Nina Buchmann,C. Bernhofer,Arnaud Carrara,Frédéric Chevallier,N. de Noblet,Andrew D. Friend,Pierre Friedlingstein,Thomas Grünwald,Bernard Heinesch,Petri Keronen,Alexander Knohl,Gerhard Krinner,Denis Loustau,Giovanni Manca,Giorgio Matteucci,Franco Miglietta,Jean-Marc Ourcival,Dario Papale,Kim Pilegaard,Serge Rambal,G. Seufert,Jean-François Soussana,María José Sanz,Ernst Detlef Schulze,Timo Vesala,Riccardo Valentini +32 more
TL;DR: An increase in future drought events could turn temperate ecosystems into carbon sources, contributing to positive carbon-climate feedbacks already anticipated in the tropics and at high latitudes.
Journal ArticleDOI
Increased plant growth in the northern high latitudes from 1981 to 1991
TL;DR: In this paper, the authors present evidence from satellite data that the photosynthetic activity of terrestrial vegetation increased from 1981 to 1991 in a manner that is suggestive of an increase in plant growth associated with a lengthening of the active growing season.
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