Maxime Thomas
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View article: Permafrost Thaw Drives Iron and Organic Carbon Release Into Soil Pore Water During Palsa to Degraded Palsa Transition
Permafrost Thaw Drives Iron and Organic Carbon Release Into Soil Pore Water During Palsa to Degraded Palsa Transition Open
Permafrost degradation, driven by rising temperatures in high‐latitude regions, destabilizes previously sequestered soil organic carbon (OC), increasing greenhouse gas emissions and amplifying global warming. In these ecosystems, interacti…
View article: Mineral-bound organic carbon exposed by hillslope thermokarst terrain: case study in Cape Bounty, Canadian High Arctic
Mineral-bound organic carbon exposed by hillslope thermokarst terrain: case study in Cape Bounty, Canadian High Arctic Open
Arctic landscapes could add 55–230 Pg of carbon (in CO2 equivalent) to the atmosphere, through CO2 and CH4 emissions, by the end of this century. These estimates could be quantified more accurately by constraining the contribution of rapid…
View article: Lengthening of biogeochemical processes during winter in degraded permafrost soils
Lengthening of biogeochemical processes during winter in degraded permafrost soils Open
The consequences of permafrost thaw for organic carbon release are mainly studied in summer, considering the frozen soil is inert in winter. Here, we show that biogeochemical processes also occur during early winter. We combine Si isotopes…
View article: A Third of Organic Carbon Is Mineral Bound in Permafrost Sediments Exposed by the World's Largest Thaw Slump, Batagay, Siberia
A Third of Organic Carbon Is Mineral Bound in Permafrost Sediments Exposed by the World's Largest Thaw Slump, Batagay, Siberia Open
Organic carbon (OC) in permafrost interacts with the mineral fraction of soil and sediments, representing < 1% to ~80% of the total OC pool. Quantifying the nature and controls of mineral–OC interactions is therefore crucial for realistic …
View article: Detecting lowland thermokarst development by UAV remote sensing in the Stordalen mire, Abisko, Sweden&#160;
Detecting lowland thermokarst development by UAV remote sensing in the Stordalen mire, Abisko, Sweden  Open
In situ field studies in thawing permafrost regions have shown that C emissions resulting from organic carbon (OC) decomposition depend among others on the variability in soil water content, which can be directly related to microtopography…
View article: To what extent do iron organic carbon interactions attenuate C release from permafrost thaw?
To what extent do iron organic carbon interactions attenuate C release from permafrost thaw? Open
Enhanced thawing of the permafrost in a warming Arctic exposes previously frozen soil organic carbon (OC) to microbial decomposition, leading to the release of soil C as greenhouse gases. Depending on temperature and moisture environmental…
View article: Evidence for preservation of organic carbon interacting with iron in material displaced from retrogressive thaw slumps: Case study in Peel Plateau, western Canadian Arctic
Evidence for preservation of organic carbon interacting with iron in material displaced from retrogressive thaw slumps: Case study in Peel Plateau, western Canadian Arctic Open
In northern high latitudes, rapid warming is set to amplify carbon-climate feedbacks by enhancing permafrost thaw and biogeochemical transformation of large amounts of soil organic carbon. However, between 30 % and 80 % of permafrost soil …
View article: Evidence for late winter biogeochemical connectivity in permafrost soils
Evidence for late winter biogeochemical connectivity in permafrost soils Open
The permafrost active layer is a key supplier of soil organic carbon and mineral nutrients to Arctic rivers. In the active layer, sites of soil-water exchange are locations for organic carbon and nutrient mobilization. Previously these sit…
View article: Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams
Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams Open
On‐going shrinkage of Greenland's icecap, permafrost thaw, and changes in precipitation are exposing its landscapes to erosion and remobilization of ancient organic carbon (OC) held in soils and sedimentary rocks. The fate of this OC and p…
View article: Thermokarst processes increase the supply of stabilizing surfaces and elements (Fe, Mn, Al, and Ca) for mineral–organic carbon interactions
Thermokarst processes increase the supply of stabilizing surfaces and elements (Fe, Mn, Al, and Ca) for mineral–organic carbon interactions Open
The stabilizing properties of mineral–organic carbon (OC) interactions have been studied in many soil environments (temperate soils, podzol lateritic soils, and paddy soils). Recently, interest in their role in permafrost regions is increa…
View article: Impact of Abrupt Permafrost Thaw on Mineral Elements Release: Case Study in Peel Plateau, West Canadian Arctic.
Impact of Abrupt Permafrost Thaw on Mineral Elements Release: Case Study in Peel Plateau, West Canadian Arctic. Open
Abrupt thaw events in ice-rich permafrost regions lead to local landscape degradations (subsidence) known as thermokarst structures, which expand with present-day warming in the Arctic. Among these events, Retrogressive Thaw Slumps (RTS) e…
View article: Why Do We Need to Care About the Evolution of Mineral-organic Carbon Interactions in Permafrost Upon Thawing?
Why Do We Need to Care About the Evolution of Mineral-organic Carbon Interactions in Permafrost Upon Thawing? Open
Evidence is mounting that permafrost thaw represents a tipping element in the Earth climate system due to permafrost carbon emissions. Yet uncertainties are associated with how this will unfold. Permafrost contains 1460-1600 Gt of organic …
View article: Integrating mineral interactions with organic carbon in thawing permafrost to assess climate feedbacks
Integrating mineral interactions with organic carbon in thawing permafrost to assess climate feedbacks Open
<p>Permafrost contains 1400-1660 Gt of organic carbon (OC), from which 5-15% will likely be emitted as greenhouse gases (GHG) by 2100. The soil organic carbon stock is distributed between a pool of particulate organic matter (POM), a…