A5013185935- Atmospheric chemistry and aerosols
- Peatlands and Wetlands Ecology
- Atmospheric and Environmental Gas Dynamics
- Fire effects on ecosystems
- Lichen and fungal ecology
- Soil Carbon and Nitrogen Dynamics
- Plant responses to elevated CO2
- Botany and Plant Ecology Studies
- Bioenergy crop production and management
- Landfill Environmental Impact Studies
- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Climate change and permafrost
- Odor and Emission Control Technologies
- Species Distribution and Climate Change
- Municipal Solid Waste Management
- Forest ecology and management
- Forest Management and Policy
- Plant Water Relations and Carbon Dynamics
- Coastal wetland ecosystem dynamics
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Tree-ring climate responses
- Advanced Memory and Neural Computing
- Sustainability and Climate Change Governance
Université du Québec à Chicoutimi
2013-2024
University of Freiburg
2014-2018
Helmholtz Zentrum München
2011-2015
University of Cambridge
2015
Purdue University West Lafayette
2015
Queen Mary University of London
2015
National Institute of Standards and Technology
2015
Northeastern University
2015
North Carolina State University
2015
University of Eastern Finland
2007-2011
Abstract Arctic and alpine tundra ecosystems are large reservoirs of organic carbon 1,2 . Climate warming may stimulate ecosystem respiration release into the atmosphere 3,4 The magnitude persistency this stimulation environmental mechanisms that drive its variation remain uncertain 5–7 This hampers accuracy global land carbon–climate feedback projections 7,8 Here we synthesize 136 datasets from 56 open-top chamber in situ experiments located at 28 arctic sites which have been running for...
*Biogenic volatile organic compound (BVOC) emissions from arctic ecosystems are important in view of their role global atmospheric chemistry and unknown feedbacks to warming. These cold hotspots climate warming, which will be more severe here than averaged over the globe. We assess effects climatic warming on non-methane BVOC a subarctic heath. *We performed ecosystem-based chamber measurements gas chromatography-mass spectrometry (GC-MS) analyses BVOCs collected adsorbent two growing...
Abstract Emissions of biogenic volatile organic compounds ( BVOC s) have been earlier shown to be highly temperature sensitive in subarctic ecosystems. As these ecosystems experience rapidly advancing pronounced climate warming, we aimed investigate how warming affects the emissions long term (up 13 treatment years). We also assess whether increased litterfall resulting from vegetation changes would affect emissions. The study was conducted a field experiment with factorial open‐top chamber...
• Isoprene is a reactive hydrocarbon with an important role in atmospheric chemistry, and emissions from vegetation contribute to carbon fluxes. The magnitude of isoprene arctic peatlands not known, it may be altered by increasing UV-B radiation. emission was measured the dynamic chamber method subarctic peatland under long-term enhancement radiation targeted correspond 20% loss stratospheric ozone layer. site type flark fen dominated moss Warnstorfia exannulata sedges Eriophorum russeolum...
Emissions of isoprene, a reactive hydrocarbon, from Subarctic vegetation are not well documented. However, the Arctic is likely to experience most pronounced effects climatic warming, which may increase temperature-dependent isoprene emission. Here, we assessed emission heath subjected 3-4 degrees C in air temperature and mountain birch (Betula pubescens ssp. czerepanovii) litter addition for 7-8 yr, simulating warming subsequent expansion deciduous shrub species migration treeline. The...
Many hours of sunlight in the midnight sun period suggest that significant amounts biogenic volatile organic compounds (BVOCs) may be released from arctic ecosystems during night-time. However, emissions these are rarely studied and limited to point measurements daytime. We measured BVOC 24-hour periods field using a push-pull chamber technique collection volatiles adsorbent cartridges followed by analysis with gas chromatography-mass spectrometry. Five different vegetation communities were...
Abstract Climate warming is modifying the movement of air masses over Northern latitudes, producing and cooling events across boreal regions. These new conditions changes may mismatch plant phenology from weather conditions, affect growing period trees. Understanding processes local adaptation in bud can help to predict response plants these rapid unexpected environmental changes. Our study monitored burst set weekly during four seasons black spruce [ Picea mariana (Mill.) B.S.P.] saplings...
Abstract. The Arctic is warming at twice the global average speed, and warming-induced increases in biogenic volatile organic compounds (BVOCs) emissions from plants are expected to be drastic. current models' estimations of minimal BVOC based on very few observations have been challenged increasingly by field data. This study applied a dynamic ecosystem model, LPJ-GUESS, as platform investigate short-term long-term emission responses climate warming. Field subarctic tundra heath with...
Assessments of greenhouse gas (GHG) emissions in managed areas are facing various challenges. A non-flow-through, non-steady-state (NFT-NSS) chamber coupled to a frame permanently inserted into the landfilled substrates is standard method for quantifying GHG areas, such as pulp and paper mill sludge (PPMS) landfill sites. Frequent measurements needed minimize uncertainties on emission factors at site scale. However, maintaining long time period often impossible due landfilling management...
Chrysomela populi (poplar leaf beetle) is a common herbivore in poplar plantations whose infestation causes major economic losses. Because plant volatiles act as infochemicals, we tested whether isoprene, the main volatile organic compound (VOC) produced by poplars (Populus x canescens), affects performance of C. employing isoprene emitting (IE) and transgenic non-emitting (NE) plants. Our hypothesis was that sensed beetle orientation or lack VOC profiles metabolome with consequences for...
When abandoned peatlands undergo restoration following the extraction of peat moss, newly reintroduced diaspores may be buried by particles eroded from stripped (decomposed) or adjacent activities. This study examined, in greenhouse, tolerance six species mosses to burial peat. One experiments consisted depositing predetermined thicknesses (0, 10, and 30 mm) onto partially established mats Sphagnum true mosses. A second experiment evaluated effect a wider range depths (maximum set at 40 on...
To reach the Paris Agreement targets of holding global temperature increase below 2 °C above preindustrial levels, every human activity will need to be carbon neutral by 2050. Feasible means for industries achieve neutrality must developed and assessed economically. Herein we present a case study on available solutions net-zero from get-go planned liquefied natural gas (LNG) plant in Quebec, which would classify as large Canadian greenhouse (GHG) emitter. From literature review, options were...
Boreal lichen woodlands (LWs) are stable low tree-density zones of the Canadian boreal forest whose afforestation has been proposed as a way to create new C sinks and thus mitigate climate change. Planting operations in these remote areas however costly time-consuming, may not be necessary when soil scarification is followed by dense natural regeneration. In present study, we assessed regeneration potential dynamics six LWs Québec, Canada, 11 years after scarification. The number, size...