A5064654470- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Peatlands and Wetlands Ecology
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Mercury impact and mitigation studies
- Fire effects on ecosystems
- Isotope Analysis in Ecology
- Hydrocarbon exploration and reservoir analysis
- Oceanographic and Atmospheric Processes
- Coal Properties and Utilization
- Microbial Community Ecology and Physiology
- Diverse Educational Innovations Studies
- Marine animal studies overview
- Geological Studies and Exploration
- Marine and coastal ecosystems
- Botany and Plant Ecology Studies
University of New Hampshire
2021-2024
University of New Hampshire at Manchester
2023-2024
University of Alberta
2018-2023
Bolin Centre for Climate Research
2023
Stockholm University
2021-2023
Woodwell Climate Research Center
2023
Wheaton College - Illinois
2014
Abstract The northern permafrost region has been projected to shift from a net sink source of carbon under global warming. However, estimates the contemporary greenhouse gas (GHG) balance and budgets remain highly uncertain. Here, we construct first comprehensive bottom‐up CO 2 , CH 4 N O across terrestrial using databases more than 1000 in situ flux measurements land cover‐based ecosystem upscaling approach for period 2000–2020. Estimates indicate that emitted mean annual 12 (−606, 661) Tg...
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. Methane (CH4) emissions from the boreal and arctic region are globally significant highly sensitive to climate change. There is currently a wide range in estimates of high-latitude annual CH4 fluxes, where based on land cover inventories empirical flux data or process models (bottom-up approaches) generally greater than atmospheric inversions (top-down approaches). A limitation bottom-up approaches has been lack harmonization between site-level classes present spatial datasets....
Northern regions have received considerable attention not only because the effects of climate change are amplified at high latitudes but also this region holds vast amounts carbon (C) stored in permafrost. These stocks vulnerable to warming temperatures and increased permafrost thaw breakdown release soil C form dioxide (CO2) methane (CH4). The majority research has focused on quantifying upscaling CO2 CH4 emissions from terrestrial systems. However, small ponds formed wetlands following...
Abstract Small waterbodies have potentially high greenhouse gas emissions relative to their small footprint on the landscape, although there is uncertainty in model estimates. Scaling carbon dioxide (CO 2 ) and methane (CH 4 exchange with atmosphere remains challenging due an incomplete understanding characterization of spatial temporal variability CO CH . Here, we measured partial pressures ( p across 30 ponds shallow lakes during summer temperate regions Europe North America. We sampled...
Global atmospheric methane concentrations are rapidly rising and becoming isotopically more depleted, implying an unresolved microbial contribution. Rising Arctic temperatures variably altering soil cycling, causing consequential uncertainty in the budget. We demonstrated wetland that below-ground microbiota methane-cycling features parallelled above-ground plant communities. To upscale emissions, we applied machine learning to remote sensing data identify habitats, which were assigned...
Abstract Permafrost thaw may increase the production of neurotoxic methylmercury (MeHg) in northern peatlands, but downstream delivery MeHg is uncertain. We quantified total mercury (THg) and concentrations lakes streams along a 1700 km permafrost transect boreal western Canada to determine influence regional extent compared local lake catchment characteristics. In lakes, we assessed sediment microbial communities modeled potential rates water column photodemethylation (PD). Regardless...
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...
Northern lakes disproportionately influence the global carbon cycle, and may do so more in future depending on how their microbial communities respond to climate warming. Microbial can change because of direct effects warming metabolism indirect groundwater connectivity from thawing surrounding permafrost, especially at lower landscape positions. Here we used shotgun metagenomics compare taxonomic functional gene composition sediment microbes 19 peatland across a 1600-km permafrost transect...
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 Small, organic‐rich lakes are important sources of methane (CH 4 ) and carbon dioxide (CO 2 to the atmosphere, yet sensitivity emissions climate warming is poorly constrained potentially influenced by permafrost thaw. Here, we monitored from 20 peatland across a 1,600 km transect in boreal western Canada. Contrary expectations, observed shift source sink CO for warmer regions, driven greater primary productivity associated with hydrological connectivity nutrient availability absence...
Abstract Large stocks of soil carbon (C) and nitrogen (N) in northern permafrost soils are vulnerable to remobilization under climate change. However, there large uncertainties present‐day greenhouse gas (GHG) budgets. We compare bottom‐up (data‐driven upscaling process‐based models) top‐down (atmospheric inversion budgets dioxide (CO 2 ), methane (CH 4 ) nitrous oxide (N O) as well lateral fluxes C N across the region over 2000–2020. Bottom‐up approaches estimate higher land‐to‐atmosphere...
The long-term net sink of carbon (C), nitrogen (N) and greenhouse gases (GHGs) in the northern permafrost region is projected to weaken or shift under climate change. But large uncertainties remain, even on present-day GHG budgets. We compare bottom-up (data-driven upscaling, process-based models) top-down budgets (atmospheric inversion main GHGs (CO2, CH4, N2O) lateral fluxes C N across over 2000-2020. Bottom-up approaches estimate higher land atmosphere for all compared atmospheric...
Vast stores of millennial-aged soil carbon (MSC) in permafrost peatlands risk leaching into the contemporary cycle after thaw caused by climate warming or increased wildfire activity. Here we tracked export and downstream fate MSC from two peatland-dominated catchments subarctic Canada, one which was recently affected wildfire. We tested whether thermokarst bog expansion deepening seasonally thawed soils due to contributions waters. Despite being available for lateral transport, accounted...
The northern permafrost region has been projected to shift from a net sink source of carbon under global warming. However, estimates the contemporary greenhouse gas (GHG) balance and budgets remain highly uncertain. Here we construct first comprehensive bottom-up CO2, CH4, N2O across terrestrial using databases more than 1000 in-situ flux measurements land cover-based ecosystem upscaling approach for period 2000-2020. Estimates indicate that emitted mean annual 0.36 (-620, 652) Tg CO2-C y-1,...
Abstract. Methane (CH4) emissions from the Boreal and Arctic region are globally significant highly sensitive to climate change. There is currently a wide range in estimates of high-latitude annual CH4 fluxes, where based on land cover inventories empirical flux data or process models (bottom-up approaches) generally greater than atmospheric inversions (top-down approaches). A limitation bottom-up approaches has been lack harmonization between site-level classes present spatial datasets....
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...
The northern permafrost region has been projected to shift from a net sink source of carbon under global warming. However, estimates the contemporary greenhouse gas (GHG) balance and budgets remain highly uncertain. Here we construct first comprehensive bottom-up CO, CH, NO across terrestrial using databases more than 1000 in-situ flux measurements land cover-based ecosystem upscaling approach for period 2000-2020. Estimates indicate that emitted mean annual 0.36 (-620, 652) Tg CO-C y, 38...
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...
Arctic and sub-Arctic regions host a large number of waterbodies that serve as carbon sources to the atmosphere within an environment is predominantly characterized by sequestration. The ongoing permafrost thaw in warming anticipated alter distribution freshwater ecosystems, subsequently affecting their contribution overall budget. Estimates global budgets largely disregard emissions caused thaw, also for ecosystems are highly uncertain date. A general constraint this field data scarcity...
The Arctic-boreal zone and its permafrost regions have historically been sparsely measured for carbon dioxide methane fluxes. This data sparsity has created significant uncertainties in budget estimates. However, over the past decade, availability of flux increased substantially. Yet, it remains scattered across different repositories, papers, unpublished sources, making hard to estimate more accurate budgets. To address this research gap, we compiled a database fluxes (ABCFlux v2) from...
Abstract Northern peatlands are a globally significant source of methane (CH 4 ), and emissions projected to increase due warming permafrost loss. Understanding the microbial mechanisms behind patterns in CH production will be key predicting annual changes, with stable carbon isotopes (δ 13 C‐CH ) being powerful tool for characterizing these drivers. Given that δ is used top‐down atmospheric inversion models partition sources, our ability model pathways associated values critical. We sought...
Abstract. Our understanding of how rapid Arctic warming and permafrost thaw affect global climate dynamics is restricted by limited spatio-temporal data coverage due to logistical challenges the complex landscape regions. It therefore crucial make best use available observations, including integrated analysis across disciplines observational platforms. To alleviate compilation process for syntheses, cross-scale analyses, earth system models, remote sensing applications, we introduce ARGO, a...