Peter M Lafleur
Datos Biográficos
| ID | 2743692 |
|---|---|
| NOMBRE | Peter M Lafleur |
| NOMBRES | Peter M |
| APELLIDO | Lafleur |
| FIRMA | LAFLEUR P M |
| AFILIACIONES | Trent University |
| ORCID | 0000-0003-0347-9128 |
| VERIFICADO | Sí |
| TOTAL DE OBRAS | 12 |
| TOTAL DE CITAS | 2 |
| TOTAL COMO AUTOR | 12 |
| TOTAL COMO EDITOR | 0 |
| PRIMER AÑO DE PUBLICACIÓN | 1986 |
| AÑO MÁS RECIENTE DE PUBLICACIÓN | 2025 |
| ÍNDICE H | 1 |
In memoriam
Wayne R Rouse by MK Woo On July 26, 2024, the Canadian academic community lost one of its pioneering climatologists, Wayne R. Rouse, professor emeritus of McMaster University. A member of the McMaster Geography department (later School of Earth, Environment and Society) for 30+ years, Wayne was widely recognized as a dedicated, passionate, and adventurous scientist. During his early undergraduate training at McMaster and graduate research at McGi…
Range shifts in a foundation sedge potentially induce large Arctic ecosystem carbon losses and gains
Foundation species have disproportionately large impacts on ecosystem structure and function. As a result, future changes to their distribution may be important determinants of ecosystem carbon (C) cycling in a warmer world. We assessed the role of a foundation tussock sedge ( Eriophorum vaginatum ) as a climatically vulnerable C stock using field data, a machine learning ecological niche model, and an ensemble of terrestrial biosphere models (TB…
Shallow soils are warmer under trees and tall shrubs across Arctic and Boreal ecosystems
Soils are warming as air temperatures rise across the Arctic and Boreal region concurrent with the expansion of tall-statured shrubs and trees in the tundra. Changes in vegetation structure and function are expected to alter soil thermal regimes, thereby modifying climate feedbacks related to permafrost thaw and carbon cycling. However, current understanding of vegetation impacts on soil temperature is limited to local or regional scales and lack…
Tundra shrub effects on growing season energy and carbon dioxide exchange
Increased shrub cover on the Arctic tundra is expected to impact ecosystem-atmosphere exchanges of carbon and energy resulting in feedbacks to the climate system, yet few direct measurements of shrub tundra-atmosphere exchanges are available to corroborate expectations. Here we present energy and carbon dioxide (CO _2 ) fluxes measured using the eddy covariance technique over six growing seasons at three closely located tundra sites in Canada’s L…
Modeling the influence of snow cover on low Arctic net ecosystem exchange
The Arctic net ecosystem exchange (NEE) of CO2 between the land surface and the atmosphere is influenced by the timing of snow onset and melt. The objective of this study was to examine whether uncertainty in model estimates of NEE could be reduced by representing the influence of snow on NEE using remote sensing observations of snow cover area (SCA). Observations of NEE and time-lapse images of SCA were collected over four locations at a low Arc…
Climate control of terrestrial carbon exchange across biomes and continents
Understanding the relationships between climate and carbon exchange by terrestrial ecosystems \nis critical to predict future levels of atmospheric carbon dioxide because of the potential \naccelerating effects of positive climate–carbon cycle feedbacks. However, directly observed \nrelationships between climate and terrestrial CO2 exchange with the atmosphere across biomes \nand continents are lacking. Here we present data describing the relatio…
Connecting Atmosphere and Wetland
This article reviews the exchange of carbon dioxide (CO2) and methane (CH4) gases between wetland and atmosphere, with a primary emphasis on ecosystem-scale fluxes and their environmental controls. It is intended to complement a previous review of wetland energy and water exchanges (Lafleur 2008). It is shown that wetland exchanges of these gases are greatly variable in space and time, especially CH4. Most wetlands appear to be sinks for atmosphe…
Vulnerability of Permafrost Carbon to Climate Change
Thawing permafrost and the resulting microbial decomposition of previously frozen organic carbon (C) is one of the most significant potential feedbacks from terrestrial ecosystems to the atmosphere in a changing climate. In this article we present an overview of the global permafrost C pool and of the processes that might transfer this C into the atmosphere, as well as the associated ecosystem changes that occur with thawing. We show that account…
Connecting Atmosphere and Wetland
Wetlands are ubiquitous over the globe, comprise a vast array of ecosystem types and are of great ecological and social importance. Their functioning is intimately tied to the atmosphere by the energy and mass exchanges that take place across the wetland–atmosphere boundary. This article examines recent research into these exchanges, with an emphasis on the water vapour exchange. Although broad classes of wetland type, such as fen, bog and marsh,…
The Annual Carbon Budget for Fen and Forest in a Wetland at Arctic Treeline
Three separate research efforts conducted in the same wetland-peatland system in the northern Hudson Bay Lowland near the town of Churchill, Manitoba, allow a comparison of two carbon budget estimates, one derived from long-term growth rates of organic soil and the other based on shorter-term flux measurements. For a tundra fen and an open subarctic forest, calculations of organic soil accumulation or loss over the last half-century indicate that…
Evaporation From Wetlands
The Radiation Budget of a Subarctic Woodland Canopy
Open woodland is a major sub-type of the circum global boreal forest zone. In Canada it dominates the basins of a number of large hydroelectric schemes in which snowmelt is a critical phase of the hydrologic cycle. The forest vegetation strongly influences the radiant energy flux to the snow and is therefore important in the production of snowmelt runoff and its prediction. The radiation budget of a subarctic open woodland canopy in northern Queb…
Connecting Atmosphere and Wetland
Wetlands are ubiquitous over the globe, comprise a vast array of ecosystem types and are of great ecological and social importance. Their functioning is intimately tied to the atmosphere by the energy and mass exchanges that take place across the wetland–atmosphere boundary. This article examines recent research into these exchanges, with an emphasis on the water vapour exchange. Although broad classes of wetland type, such as fen, bog and marsh,…
The Radiation Budget of a Subarctic Woodland Canopy
Open woodland is a major sub-type of the circum global boreal forest zone. In Canada it dominates the basins of a number of large hydroelectric schemes in which snowmelt is a critical phase of the hydrologic cycle. The forest vegetation strongly influences the radiant energy flux to the snow and is therefore important in the production of snowmelt runoff and its prediction. The radiation budget of a subarctic open woodland canopy in northern Queb…
Evaporation From Wetlands
The Annual Carbon Budget for Fen and Forest in a Wetland at Arctic Treeline
Three separate research efforts conducted in the same wetland-peatland system in the northern Hudson Bay Lowland near the town of Churchill, Manitoba, allow a comparison of two carbon budget estimates, one derived from long-term growth rates of organic soil and the other based on shorter-term flux measurements. For a tundra fen and an open subarctic forest, calculations of organic soil accumulation or loss over the last half-century indicate that…
Vulnerability of Permafrost Carbon to Climate Change
Thawing permafrost and the resulting microbial decomposition of previously frozen organic carbon (C) is one of the most significant potential feedbacks from terrestrial ecosystems to the atmosphere in a changing climate. In this article we present an overview of the global permafrost C pool and of the processes that might transfer this C into the atmosphere, as well as the associated ecosystem changes that occur with thawing. We show that account…
Connecting Atmosphere and Wetland
Wetlands are ubiquitous over the globe, comprise a vast array of ecosystem types and are of great ecological and social importance. Their functioning is intimately tied to the atmosphere by the energy and mass exchanges that take place across the wetland–atmosphere boundary. This article examines recent research into these exchanges, with an emphasis on the water vapour exchange. Although broad classes of wetland type, such as fen, bog and marsh,…
Connecting Atmosphere and Wetland
This article reviews the exchange of carbon dioxide (CO2) and methane (CH4) gases between wetland and atmosphere, with a primary emphasis on ecosystem-scale fluxes and their environmental controls. It is intended to complement a previous review of wetland energy and water exchanges (Lafleur 2008). It is shown that wetland exchanges of these gases are greatly variable in space and time, especially CH4. Most wetlands appear to be sinks for atmosphe…
Climate control of terrestrial carbon exchange across biomes and continents
Understanding the relationships between climate and carbon exchange by terrestrial ecosystems \nis critical to predict future levels of atmospheric carbon dioxide because of the potential \naccelerating effects of positive climate–carbon cycle feedbacks. However, directly observed \nrelationships between climate and terrestrial CO2 exchange with the atmosphere across biomes \nand continents are lacking. Here we present data describing the relatio…
Modeling the influence of snow cover on low Arctic net ecosystem exchange
The Arctic net ecosystem exchange (NEE) of CO2 between the land surface and the atmosphere is influenced by the timing of snow onset and melt. The objective of this study was to examine whether uncertainty in model estimates of NEE could be reduced by representing the influence of snow on NEE using remote sensing observations of snow cover area (SCA). Observations of NEE and time-lapse images of SCA were collected over four locations at a low Arc…
Tundra shrub effects on growing season energy and carbon dioxide exchange
Increased shrub cover on the Arctic tundra is expected to impact ecosystem-atmosphere exchanges of carbon and energy resulting in feedbacks to the climate system, yet few direct measurements of shrub tundra-atmosphere exchanges are available to corroborate expectations. Here we present energy and carbon dioxide (CO _2 ) fluxes measured using the eddy covariance technique over six growing seasons at three closely located tundra sites in Canada’s L…
Shallow soils are warmer under trees and tall shrubs across Arctic and Boreal ecosystems
Soils are warming as air temperatures rise across the Arctic and Boreal region concurrent with the expansion of tall-statured shrubs and trees in the tundra. Changes in vegetation structure and function are expected to alter soil thermal regimes, thereby modifying climate feedbacks related to permafrost thaw and carbon cycling. However, current understanding of vegetation impacts on soil temperature is limited to local or regional scales and lack…
Range shifts in a foundation sedge potentially induce large Arctic ecosystem carbon losses and gains
Foundation species have disproportionately large impacts on ecosystem structure and function. As a result, future changes to their distribution may be important determinants of ecosystem carbon (C) cycling in a warmer world. We assessed the role of a foundation tussock sedge ( Eriophorum vaginatum ) as a climatically vulnerable C stock using field data, a machine learning ecological niche model, and an ensemble of terrestrial biosphere models (TB…
In memoriam
Wayne R Rouse by MK Woo On July 26, 2024, the Canadian academic community lost one of its pioneering climatologists, Wayne R. Rouse, professor emeritus of McMaster University. A member of the McMaster Geography department (later School of Earth, Environment and Society) for 30+ years, Wayne was widely recognized as a dedicated, passionate, and adventurous scientist. During his early undergraduate training at McMaster and graduate research at McGi…
Environmental Science (10 obras) · Geography (10 obras) · Ecology (9 obras) · Ecosystem (9 obras) · Biology (8 obras) · Atmospheric sciences (7 obras) · Geology (7 obras) · Meteorology (7 obras) · Climate change and permafrost (6 obras) · Cryospheric studies and observations (5 obras)