About
13
Publications
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236
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Citations since 2017
Introduction
Research interests: Carbon release from thawing permafrost and subsequent environmental and microbial processing; Permafrost organic carbon quality and biolability; Organic matter and microbiological interaction in terrestrial and aquatic systems
Additional affiliations
July 2017 - present
June 2012 - May 2017
May 2011 - August 2011
Education
August 2012 - May 2017
August 2008 - December 2011
Publications
Publications (13)
Permafrost thaw subjects previously frozen organic carbon (OC) to microbial decomposition, generating the greenhouse gases (GHG) carbon dioxide (CO2) and methane (CH4) and fueling a positive climate feedback. Over one‐quarter of permafrost OC is stored in deep, ice‐rich Pleistocene‐aged yedoma permafrost deposits. We used a combination of anaerobic...
Permafrost thaw subjects previously frozen soil organic carbon (SOC) to microbial degradation to the greenhouse gases carbon dioxide (CO2) and methane (CH4). Emission of these gases constitutes a positive feedback to climate warming. Among numerous uncertainties in estimating the strength of this permafrost carbon feedback (PCF), two are: (i) how m...
Greenhouse gas emissions from physical permafrost thaw disturbance and subsidence, including the formation and expansion of thermokarst (thaw) lakes, may double the magnitude of the permafrost carbon feedback this century. These processes are not accounted for in current global climate models. Thermokarst lakes, in particular, have been shown to be...
Hydrological transformations induced by climate warming are causing Arctic annual fluvial energy to shift from skewed (snowmelt-dominated) to multimodal (snowmelt-and rainfall-dominated) distributions. We integrated decade-long hydrometeorological and biogeo-chemical data from the High Arctic to show that shifts in the timing and magnitude of annua...
Climate warming and permafrost thaw have the potential to shift Arctic carbon (C) cycling dynamics so ponds, which represent over a quarter of northern circumpolar surface water area, may play a larger role in the mineralization of terrestrial C and emission of greenhouse gases (GHG). Here, we constrain how active layer detachments (ALDs) affect C...
Abstract
Climate warming-related hydrological transformations are changing material mobilization, composition, and transport pathways along the terrestrial-aquatic continuum. Here, we integrate decade-long hydrometeorological and biogeochemical data from the High Arctic to show that annual fluvial energy is shifting from a skewed (snowmelt-dominate...
Microbial decomposition of thawed permafrost carbon in thermokarst lakes leads to the release of ancient carbon as the greenhouse gas methane (CH4), a potential greenhouse gas, yet potential mitigating processes are not understood. Here, we report on δ13C-CH4 enrichment in the pore water of a thermokarst lake sediment core that points towards in si...
A lasting legacy of the International Polar Year (IPY) 2007–2008 was the promotion of the Permafrost Young Researchers Network (PYRN), initially an IPY outreach and education activity by the International Permafrost Association (IPA). With the momentum of IPY, PYRN developed into a thriving network that still connects young permafrost scientists, e...
Thawing permafrost supplies dissolved organic carbon (DOC) to aquatic systems; however, the magnitude, variability and fate of this DOC is not well constrained. Our objective was to examine DOC respiration from seasonally thawed and near-surface (<1.5 m) permafrost soils collected from five locations in the Kolyma River Basin, north-east Russia. We...
Thermokarst (thaw) lakes are an important source of atmospheric CH4; however, few studies have examined the composition and biodegradability of their sediment organic matter (OM). We have quantified the (i) composition of bulk sediment OM (bulk SOM) using pyrolysis gas chromatography-mass spectrometry (GC-MS) and (ii) statistical relationships betw...
Thermokarst (thaw) lakes emit methane (CH4) to the
atmosphere formed from thawed permafrost organic matter (OM),
but the relative magnitude of CH4 production in
surface lake sediments vs. deeper thawed permafrost horizons
is not well understood. We assessed anaerobic CH4
production potentials from various depths along a 590 cm long
lake sediment co...
Thermokarst (thaw) lakes emit methane (CH4) to the
atmosphere formed from thawed permafrost organic matter (OM),
but the relative magnitude of CH4 production in
surface lake sediments vs. deeper thawed permafrost horizons
is not well understood. We assessed anaerobic CH4
production potentials from various depths along a 590 cm long
lake sediment co...
