A5084327074- Peatlands and Wetlands Ecology
- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Botany and Plant Ecology Studies
- Coastal wetland ecosystem dynamics
- Atmospheric and Environmental Gas Dynamics
- Fire effects on ecosystems
- Species Distribution and Climate Change
- Ocean Acidification Effects and Responses
- Atmospheric chemistry and aerosols
- Heavy metals in environment
- Thermochemical Biomass Conversion Processes
- Isotope Analysis in Ecology
- Aquatic and Environmental Studies
- Integrated Water Resources Management
- Soil Carbon and Nitrogen Dynamics
- Space exploration and regulation
- Climate variability and models
- Environmental and Industrial Safety
- Coal and Its By-products
- Cinema and Media Studies
Vrije Universiteit Amsterdam
2024-2025
Uppsala University
2020-2024
University of Alberta
2018-2024
The University of Adelaide
2024
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. Methane emissions from boreal and arctic wetlands, lakes, rivers are expected to increase in response warming associated permafrost thaw. However, the lack of appropriate land cover datasets for scaling field-measured methane circumpolar scales has contributed a large uncertainty our understanding present-day future emissions. Here we present Boreal–Arctic Wetland Lake Dataset (BAWLD), dataset based on an expert assessment, extrapolated using random forest modelling available...
Permafrost peatlands store globally significant amounts of soil organic carbon (SOC) that may be vulnerable to climate change. thaw exposes deeper, older SOC microbial activity, but vulnerability mineralization and release as dioxide is likely influenced by the environmental conditions follow thaw. in peat plateaus, dominant type permafrost North America, occurs both through deepening active layer thermokarst. Active aged predominately oxic conditions, while thermokarst associated with...
Abstract Peatlands in northern permafrost regions store a significant proportion of global soil carbon. Recent warming is accelerating peatland thaw and thermokarst collapse, exposing previously frozen peat to microbial decomposition potential mineralization into greenhouse gases. Here, we show from site the sporadic‐discontinuous zone western Canada that collapse leads neither large losses nor gains following thaw, as deep carbon are offset by surficial accumulation. We collected cores...
Northern peatlands store globally-important amounts of carbon in the form partly decomposed plant detritus. Drying associated with climate and land-use change may lead to increased fire frequency severity rapid loss atmosphere. However, our understanding patterns drivers peatland burning on an appropriate decadal millennial timescale relies heavily individual site-based reconstructions. For first time, we synthesise macrocharcoal records from across North America, Europe, Patagonia reveal...
Abstract Rapid, ongoing permafrost thaw of peatlands in the discontinuous zone is exposing a globally significant store soil carbon (C) to microbial processes. Mineralization and release this peat C atmosphere as greenhouse gases potentially important feedback climate change. Here we investigated effects on at peatland complex western Canada. We collected 15 complete cores (between 2.7 4.5 m deep) along four chronosequences, from elevated plateaus saturated thermokarst bogs that thawed up...
Abstract. Permafrost thaw in northern peatlands often leads to increased methane (CH4) emissions, but the underlying controls responsible for emissions and duration which they persist have yet be fully elucidated. We assessed how shifting environmental conditions affect microbial communities magnitude stable isotopic signature (δ13C) of CH4 along a thermokarst bog transect boreal western Canada. Thermokarst bogs develop following permafrost when dry, elevated peat plateaus collapse become...
Abstract The greenhouse gas (GHG) balance of boreal peatlands in permafrost regions will be affected by climate change through disturbances such as thaw and wildfire. Although the future GHG including ponds is dominated exchange both carbon dioxide (CO 2 ) methane (CH 4 ), disturbance impacts on fluxes potent nitrous oxide (N O) could contribute to shifts net radiative balance. Here, we measured monthly (April October) N O, CH , CO from three sites located across sporadic discontinuous zones...
Abstract. As the permafrost region warms and soils thaw, vast stores of soil organic carbon (C) become vulnerable to enhanced microbial decomposition lateral transport into aquatic ecosystems as dissolved (DOC). The mobilization C can drastically alter net northern budget. DOC entering becomes biologically available for degradation well other types processing. However, it currently remains unclear which landscape characteristics are most relevant consider in terms predicting concentrations...
ABSTRACT Permafrost microbial research has flourished in the past decades, due part to improvements sampling and molecular techniques, but also increased focus on permafrost greenhouse gas feedback climate change other ecological processes high latitude alpine soils. microorganisms are adapted these extreme environments remain active at low temperatures when resources limited. They an important component of global elemental cycles as they regulate organic matter turnover production,...
Peatlands cause ~2% of anthropogenic greenhouse gas (GHG) emissions due to drainage. In study, we aimed assess (1) if laboratory aerobic and anaerobic heterotrophic respiration rates peat layers accurately represent observed CO2 CH4 (chamber eddy-covariance respectively) emissions, (2) the contribution processes surface GHG emission fluxes. Furthermore, hypothesized that redox potential is more suitable than water table depth capture metabolic soil associated rates, are crucial when...
Abstract Permafrost thaw in northern peatlands causes collapse of permafrost peat plateaus and thermokarst bog development, with potential impacts on atmospheric greenhouse gas exchange. Here, we measured methane carbon dioxide fluxes over 3 years (including winters) using static chambers along two transects northwestern Canada, spanning young (~30 since thaw), intermediate mature bogs (~200 thaw). Young were wetter, warmer had more hydrophilic vegetation than bogs. Methane emissions...
Abstract Northern peatlands store a globally significant amount of soil organic carbon, much it found in rapidly thawing permafrost. Permafrost thaw often leads to the development and expansion thermokarst bogs, where microbial activity will determine stability carbon storage release greenhouse gases. In this study, we compared potential enzyme activities between young (thawed ~30 years ago) mature (~200 years) for both shallow deep peat layers. We very low layers, with no differences bogs....
Abstract. Methane emissions from boreal and arctic wetlands, lakes, rivers are expected to increase in response warming associated permafrost thaw. However, the lack of appropriate land cover datasets for scaling field-measured methane circumpolar scales has contributed a large uncertainty our understanding present-day future emissions. Here we present Boreal-Arctic Wetland Lake Dataset (BAWLD), dataset based on an expert assessment, extrapolated using random forest modelling available...
Abstract Permafrost thaw in peatlands risks emitting vast stores of soil organic carbon (SOC) as greenhouse gases to the atmosphere, yet anoxic conditions and low peat quality may prevent rapid SOC loss. To assess differences anaerobic mineralization following vulnerability previously‐frozen peat, we incubated (5° 14°C) from 15 depths ⁓6 m cores different sites including an intact permafrost plateau thermokarst bogs that thawed ∼30 ∼200 years ago. Furthermore, a glucose‐addition experiment...
Abstract Methane (CH 4 ) and carbon dioxide (CO 2 emissions from small peatland lakes may be highly sensitive to climate warming thermokarst expansion caused by permafrost thaw. We studied effects of on ebullitive CH CO fluxes diffusive a thaw lake in boreal western Canada. Ebullitive the edge (236 ± 61 mg m −2 d −1 were double quadruple that stable center, respectively. Modeled did not differ between thawing edges (~ 50 but center. Radiocarbon ( 14 C) analysis bubbles was older 1211 1420 C...
Rising air temperatures are leading to both an increase in frequency of freeze-thaw cycles (FTCs) during the winter months, and increased fire severity growing season northern temperate peatlands. Both FTCs fires have been shown impact plant microbial community composition, nutrient availability, plant-microbe interactions. Ultimately such changes may affect carbon cycling While examples from vegetation numerous, no study has assessed resilience peatland communities combined disturbance...