R F Grant

Datos Biográficos

ID6823199
NOMBRER F Grant
NOMBRESR F
APELLIDOGrant
FIRMAGRANT R F
AFILIACIONESUniversity of Alberta
ORCID0000-0002-8890-6231
VERIFICADOSí
TOTAL DE OBRAS11
TOTAL DE CITAS0
TOTAL COMO AUTOR11
TOTAL COMO EDITOR0
PRIMER AÑO DE PUBLICACIÓN2018
AÑO MÁS RECIENTE DE PUBLICACIÓN2025
ÍNDICE H0

  • Hydrology controls thermokarst and alters carbon cycling and methane emissions in peatlands near the southern limit of permafrost

    Open AccessIan Shirley, Z A Mekonnen et al.ARTICLEEnvironmental Research Letters2025

    Permafrost peatlands store vast amounts of frozen carbon across northern landscapes. When ground ice melts, surface subsidence produces thermokarst landforms that expand wetlands at the edges of permafrost plateaus. Thermokarst represents an accelerating climate feedback, but uncertainties remain about how ground ice, hydrology, and vegetation interact to shape landscape change and carbon fluxes. We extended the process-based model ecosys to simu…

  • Unraveling the depth-dependent causal dynamics of methanogenesis and methanotrophy in a high-latitude fen peatland

    Open AccessShuai Yang, Jinyun Tang et al.ARTICLEEnvironmental Research Letters2025

    The dynamics of methane (CH 4 ) cycling in high-latitude peatlands through different pathways of methanogenesis and methanotrophy are still poorly understood due to the spatiotemporal complexity of microbial activities and biogeochemical processes. Additionally, long-term in situ measurements within soil columns are limited and associated with large uncertainties in microbial substrates (e.g. dissolved organic carbon, acetate, hydrogen). To bette…

  • Soil incubation methods lead to large differences in inferred methane production temperature sensitivity

    Open AccessZhen Li, R F Grant et al.ARTICLEEnvironmental Research Letters2024

    Quantifying the temperature sensitivity of methane (CH 4 ) production is crucial for predicting how wetland ecosystems will respond to climate warming. Typically, the temperature sensitivity (often quantified as a Q 10 value) is derived from laboratory incubation studies and then used in biogeochemical models. However, studies report wide variation in incubation-inferred Q 10 values, with a large portion of this variation remaining unexplained. H…

  • Changes in high-latitude surface energy balance driven by snowpack and vegetation dynamics under warmer climate

    Open AccessZ A Mekonnen, W J Riley et al.ARTICLEEnvironmental Research Letters2024

    With rapid climate warming, expected changes in snowpack and vegetation will alter the seasonal surface albedo of high-latitude ecosystems. The extent to which these albedo changes may affect surface energy balances and thus soil temperatures is uncertain, but represents a potentially important component of ecosystem feedbacks to climate change. Here, we apply a well-tested process-rich ecosystem model, ecosys , to examine changes in seasonal sur…

  • Improved quantification of cover crop biomass and ecosystem services through remote sensing-based model–data fusion

    Open AccessLexuan Ye, Kaiyu Guan et al.ARTICLEEnvironmental Research Letters2023

    Cover crops have long been seen as an effective management practice to increase soil organic carbon (SOC) and reduce nitrogen (N) leaching. However, there are large uncertainties in quantifying these ecosystem services using either observation (e.g. field measurement, remote sensing data) or process-based modeling. In this study, we developed and implemented a model–data fusion (MDF) framework to improve the quantification of cover crop benefits …

  • Machine learning models inaccurately predict current and future high-latitude C balances

    Open AccessIan Shirley, Z A Mekonnen et al.ARTICLEEnvironmental Research Letters2022

    The high-latitude carbon (C) cycle is a key feedback to the global climate system, yet because of system complexity and data limitations, there is currently disagreement over whether the region is a source or sink of C. Recent advances in big data analytics and computing power have popularized the use of machine learning (ML) algorithms to upscale site measurements of ecosystem processes, and in some cases forecast the response of these processes…

  • Wildfire exacerbates high-latitude soil carbon losses from climate warming

    Open AccessZ A Mekonnen, W J Riley et al.ARTICLEEnvironmental Research Letters2022

    Arctic and boreal permafrost soil organic carbon (SOC) decomposition has been slower than carbon inputs from plant growth since the last glaciation. Anthropogenic climate warming has threatened this historical trend by accelerating SOC decomposition and altering wildfire regimes. We accurately modeled observed plant biomass and carbon emissions from wildfires in Alaskan ecosystems under current climate conditions. In projections to 2300 under the…

  • Non-growing season plant nutrient uptake controls Arctic tundra vegetation composition under future climate

    Open AccessW J Riley, Z A Mekonnen et al.ARTICLEEnvironmental Research Letters2021

    Plant growth and distribution in high-latitude tundra ecosystems is strongly limited by nutrient availability and is critical for quantifying centennial-scale carbon-climate interactions. However, land model representations of plant–nutrient interactions are uncertain, leading to poor comparisons with high-latitude observations. Although it has been recognized for decades in the observational community that plants continue to acquire nutrients we…

  • Rapidly changing high-latitude seasonality

    Open AccessIan Shirley, Z A Mekonnen et al.ARTICLEEnvironmental Research Letters2021

    Seasonal variations in high-latitude terrestrial carbon (C) fluxes are predominantly driven by air temperature and radiation. At present, high-latitude net C uptake is largest during the summer. Recent observations and modeling studies have demonstrated that ongoing and projected climate change will increase plant productivity, microbial respiration, and growing season lengths at high-latitudes, but impacts on high-latitude C cycle seasonality (a…

  • Changes in precipitation and air temperature contribute comparably to permafrost degradation in a warmer climate

    Open AccessZ A Mekonnen, W J Riley et al.ARTICLEEnvironmental Research Letters2021

    Surface energy budgets of high-latitude permafrost systems are poorly represented in Earth system models (ESMs), yet permafrost is rapidly degrading and these dynamics are critical to future carbon-climate feedback predictions. A potentially important factor in permafrost degradation neglected so far by ESMs is heat transfer from precipitation, although increases in soil temperature and thaw depth have been observed following increases in precipi…

  • St century tundra shrubification could enhance net carbon uptake of North America Arctic tundra under an RCP8.5 climate trajectory

    Open AccessZ A Mekonnen, W J Riley et al.ARTICLEEnvironmental Research Letters2018

    Recent observed shifts in Arctic tundra shrub cover have uncertain impacts on 21st century net ecosystem carbon exchanges. Here we applied a well-tested ecosystem model, ecosys, to examine the effects of North America Arctic tundra plant dynamics on ecosystem carbon balances from 1980-2100 under the RCP8.5 scenario. Tundra productivity was modeled to increase from enhanced carbon fixation and N mineralization under recent and future climates. Bet…