Gesa Meyer
A5044399239- Climate change and permafrost
- Cryospheric studies and observations
- Plant Water Relations and Carbon Dynamics
- Atmospheric and Environmental Gas Dynamics
- Geology and Paleoclimatology Research
- Fire effects on ecosystems
- Peatlands and Wetlands Ecology
- Forest ecology and management
- Forest Insect Ecology and Management
- Soil and Unsaturated Flow
- Tree-ring climate responses
- Climate Change Policy and Economics
- Climate variability and models
- Geological Studies and Exploration
- Hydrology and Watershed Management Studies
- Immune Cell Function and Interaction
- Methane Hydrates and Related Phenomena
- 3D Modeling in Geospatial Applications
- Arctic and Russian Policy Studies
- NF-κB Signaling Pathways
- Atmospheric chemistry and aerosols
- Soil Geostatistics and Mapping
- Geological Modeling and Analysis
- Healthcare Systems and Challenges
- Soil Carbon and Nitrogen Dynamics
Université de Montréal
2020-2025
Environment and Climate Change Canada
2020-2024
Carleton University
2020-2021
University of British Columbia
2013-2019
Abstract. Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, terrestrial biosphere in a changing climate is critical to better understand global cycle, support development policies, project future change. Here we describe synthesize data sets methodology quantify five major components budget uncertainties. Fossil CO2 (EFOS) are based on energy statistics cement production data, while from land-use change (ELUC), mainly...
Abstract Tundra and boreal ecosystems encompass the northern circumpolar permafrost region are experiencing rapid environmental change with important implications for global carbon (C) budget. We analysed multi-decadal time series containing 302 annual estimates of dioxide (CO 2 ) flux across 70 non-permafrost ecosystems, 672 summer CO 181 ecosystems. find an increase in sink but not despite similar increases uptake. Thus, recent non-growing-season losses have substantially impacted balance...
Abstract The Arctic–Boreal Zone is rapidly warming, impacting its large soil carbon stocks. Here we use a new compilation of terrestrial ecosystem CO 2 fluxes, geospatial datasets and random forest models to show that although the was overall an increasing sink from 2001 2020 (mean ± standard deviation in net exchange, −548 140 Tg C yr −1 ; trend, −14 P < 0.001), more than 30% region source. Tundra regions may have already started function on average as sources, demonstrating shift...
Abstract. Past efforts to synthesize and quantify the magnitude change in carbon dioxide (CO2) fluxes terrestrial ecosystems across rapidly warming Arctic–boreal zone (ABZ) have provided valuable information but were limited their geographical temporal coverage. Furthermore, these been based on data aggregated over varying time periods, often with only minimal site ancillary data, thus limiting potential be used large-scale budget assessments. To bridge gaps, we developed a standardized...
Long-term atmospheric CO2 concentration records have suggested a reduction in the positive effect of warming on high-latitude carbon uptake since 1990s. A variety mechanisms been proposed to explain reduced net sink northern ecosystems with increased air temperature, including water stress vegetation and respiration over recent decades. However, lack consistent long-term flux situ soil moisture data has severely limited our ability identify responsible for strength. In this study, we used...
Abstract Arctic warming is affecting snow cover and soil hydrology, with consequences for carbon sequestration in tundra ecosystems. The scarcity of observations the has limited our understanding impact covarying environmental drivers on balance In this study, we address some these uncertainties through a novel record 119 site-years summer data from eddy covariance towers representing dominant vegetation types located continuous permafrost Arctic. Here found that earlier snowmelt was...
Over the past decade, British Columbia (BC), has experienced largest mountain pine beetle (MPB) outbreak on record. This study used eddy-covariance (EC) technique to examine impact of MPB attack evapotranspiration (E) and associated canopy characteristics two lodgepole stands with secondary structure (trees, saplings seedlings surviving attack) located in central BC. MPB-06, an 85-year-old almost pure stand trees, was first attacked 2006, by 2010, ~80% trees had been killed. MPB-03, a...
Abstract. Our study evaluates the impacts of an alternate snow cover fraction (SCF) parameterization on simulation in Canadian Land Surface Scheme Including Biogeochemical Cycles (CLASSIC). Three reanalysis-based meteorological datasets are used to drive model account for uncertainties forcing data. While default assumes a simple linear relationship between SCF and depth with no dependence topography, accounts topographic effects sub-grid terrain SCF. We show that improves simulated CLASSIC...
Abstract. The recent mountain pine beetle (MPB) outbreak has had an impact on the carbon (C) cycling of lodgepole forests in British Columbia. This study examines how partial harvesting as a forest management response to MPB infestation affects net ecosystem production (NEP) mixed conifer (MPB-09) Interior BC. MPB-09 is 70-year-old stand that was partially harvested 2009 after it been attacked by MPB. Using eddy-covariance technique, C dynamics were studied over two years and compared...
Abstract. Climate change in the Arctic is leading to shifts vegetation communities, permafrost degradation and alteration of tundra surface–atmosphere energy carbon (C) fluxes, among other changes. However, year-round C flux measurements at high-latitude sites remain rare. This poses a challenge for evaluating impacts climate on ecosystems developing process-based models, which may be used predict regional global feedbacks system. Our study 14 years seasonal eddy covariance (EC) dioxide...
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Abstract. Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, terrestrial biosphere in a changing climate is critical to better understand global cycle, support development policies, project future change. Here we describe synthesise data sets methodology quantify five major components budget uncertainties. Fossil CO2 (EFOS) are based on energy statistics cement production data, while from land-use change (ELUC), mainly...
Abstract The Arctic-Boreal Zone (ABZ) is rapidly warming, impacting its large soil carbon stocks. We use a new compilation of terrestrial ecosystem CO 2 fluxes, geospatial datasets and random forest models to show that although the ABZ was an increasing sink from 2001 2020 (mean ± standard deviation in net exchange: −548 140 Tg C yr -1 ; trend: −14 , p<0.001), more than 30% region source. Tundra regions may have already started function on average as sources, demonstrating critical shift...
Globally, forests are facing a wide range of disturbances that significantly impact carbon dioxide (CO2) and water vapour exchange. In British Columbia (BC), Canada, coastal Douglas-fir interior lodgepole pine two the most common tree species. Led by some early studies in 1970s, long-term BC forest research clusters were established using eddy-covariance techniques to further investigate disruption recovery CO2 exchange after natural anthropogenic disturbances. By synthesizing results...
Abstract. The Arctic is warming more rapidly than other regions of the world leading to ecosystem change including shifts in vegetation communities, permafrost degradation and alteration tundra surface-atmosphere energy carbon (C) fluxes, among others. However, year-round C flux measurements at high-latitude sites remain rare. This poses a challenge for evaluating impacts climate on ecosystems developing process-based models, which may be used predict regional global feedbacks system. Our...
Abstract. Estimates of winter (snow-covered non-growing season) CO2 fluxes across the Arctic region vary by a factor 3.5, with considerable variation between measured and simulated fluxes. Measurements snow properties, soil temperatures, net ecosystem exchange (NEE) at Trail Valley Creek, NWT, Canada, allowed for evaluation NEE in tundra environment Community Land Model (CLM5.0). Default CLM5.0 parameterisations did not adequately simulate this environment, near-zero (< 0.01 gCm-2d-1)...
eddy covariance data PI), and Gabriel Hould Gosselin (ghouldgosselin
Abstract. Past efforts to synthesize and quantify the magnitude change in carbon dioxide (CO2) fluxes terrestrial ecosystems across rapidly warming Arctic-Boreal Zone (ABZ) have provided valuable information, but were limited their geographical temporal coverage. Furthermore, these been based on data aggregated over varying time periods, often with only minimal site ancillary data, thus limiting potential be used large-scale budget assessments. To bridge gaps, we developed a standardized...