Browsing Hopkinson, Christopher by Title

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  • Aboveground biomass allocation of boreal shrubs and short-stature trees in northwestern Canada 
    Flade, Linda; Hopkinson, Christopher; Chasmer, Laura (MDPIArts and ScienceDepartment of Geograpy and EnvironmentUniversity of Lethbridgehttps://doi.org/10.3390/f12020234, 2021)
    In this follow-on study on aboveground biomass of shrubs and short-stature trees, we provide plant component aboveground biomass (herein ‘AGB’) as well as plant component AGB allometric models for five common boreal shrub ...
  • Allometric equations for shrubs and short-stature tree aboveground biomass within boreal ecosystems of northwestern Canada 
    Flade, Linda; Hopkinson, Christopher; Chasmer, Laura (MDPIArts and ScienceDepartment of Geograpy and EnvironmentUniversity of Lethbridgehttps://doi.org/10.3390/f11111207, 2020)
    Aboveground biomass (AGB) of short-stature shrubs and trees contain a substantial part of the total carbon pool within boreal ecosystems. These ecosystems, however, are changing rapidly due to climate-mediated atmospheric ...
  • Fluvial carbon export from a lowland Amazonian rainforest in relation to atmospheric fluxes 
    Vihermaa, Leena E.; Waldron, Susan; Domingues, Tomas; Grace, John; Cosio, Eric G.; Limonchi, Fabian; Hopkinson, Christopher; da Rocha, Humberto R.; Gloor, Emanuel (AGU PublicationsArts and ScienceDepartment of Geography and EnvironmentUniversity of GlasgowUniversidade de Sao PauloUniversity of EdinburghPontificia Universidad Católica de PerúUniversity of LethbridgeUniversity of Leedshttps://doi.org/10.1002/2016JG003464, 2016)
    We constructed a whole carbon budget for a catchment in the Western Amazon Basin, combining drainage water analyses with eddy covariance (EC) measured terrestrial CO2 fluxes. As fluvial C export can represent permanent ...
  • Partitioning carbon losses from fire combustion in a montane valley, Alberta Canada 
    Gerrand, S.; Aspinall, J.; Jensen, T.; Hopkinson, Christopher; Collingwood, A.; Chasmer, Laura (ElsevierArts and ScienceDepartment of Chemistry and BiochemistryUniversity of LethbridgeDown to Earth LabsParks Canadahttps://doi.org/10.1016/j.foreco.2021.119435, 2021)
    Direct carbon (C) emissions from wildland fires have been difficult to quantify, especially in montane environments where sites are difficult to access. Here we examined pre-fire C partitioning and losses in a southern ...
  • Peatland-fire interactions: a review of wildland fire feedbacks and interactions in Canadian boreal peatlands 
    Nelson, Kailyn; Thompson, D.; Hopkinson, Christopher; Petrone, R.; Chasmer, Laura (ElsevierArts and ScienceDepartment of Geograpy and EnvironmentUniversity of LethbridgeGreat Lakes Forestry CentreUniversity of Waterloohttps://doi.org/10.1016/j.scitotenv.2021.145212, 2021)
    Boreal peatlands store a disproportionately large quantity of soil carbon (C) and play a critical role within the global C-climate system; however, with climatic warming, these C stores are at risk. Increased wildfire ...
  • Remote sensing of boreal wetlands 1: data use for policy and mangement 
    Chasmer, Laura; Cobbaert, Danielle; Mahoney, Craig; Millard, Koreen; Peters, Daniel; Devito, Kevin; Brisco, Brian; Hopkinson, Christopher; Merchant, Michael; Montgomery, Joshua; Nelson, Kailyn; Niemann, Olaf (MDPIArts and ScienceDepartment of Geograpy and EnvironmentUniversity of LethbridgeAlberta Environment and ParksCarleton UniversityEnvironment and Climate Change CanadaUniversity of AlbertaCanada Centre for Mapping and Earth ObservationDucks Unlimited CanadaUniversity of Victoriahttps://doi.org/10.3390/rs12081320, 2020)
    Wetlands have and continue to undergo rapid environmental and anthropogenic modification and change to their extent, condition, and therefore, ecosystem services. In this first part of a two-part review, we provide ...
  • Remote sensing of boreal wetlands 2: methods for evaluating boreal wetland ecosystem state and drivers of change 
    Chasmer, Laura; Mahoney, Craig; Millard, Koreen; Nelson, Kailyn; Peters, Daniel; Merchant, Michael; Hopkinson, Christopher; Brisco, Brian; Niemann, Olaf; Montgomery, Joshua; Devito, Kevin; Cobbaert, Danielle (MDPIArts and ScienceDepartment of Chemistry and BiochemistryUniversity of LethbridgeAlberta Environment and ParksCarleton UniversityEnvironment and Climate Change CanadaDucks Unlimited CanadaCanada Centre for Mapping and Earth ObservationUniversity of VictoriaUniversity of Albertahttps://doi.org/10.3390/rs12081321, 2020)
    The following review is the second part of a two part series on the use of remotely sensed data for quantifying wetland extent and inferring or measuring condition for monitoring drivers of change on wetland environments. ...
  • SAR and lidar temporal data fusion approaches to boreal wetland ecosystem monitoring 
    Montgomery, Joshua; Brisco, Brian; Chasmer, Laura; Devito, Kevin; Cobbaert, Danielle; Hopkinson, Christopher (MDPIArts and ScienceDepartment of Geograpy and EnvironmentAlberta Environment and ParksUniversity of LethbridgeNatural Resources CanadaUniversity of Albertahttps://doi.org/10.3390/rs11020161, 2019)
    The objective of this study was to develop a decision-based methodology, focused on data fusion for wetland classification based on surface water hydroperiod and associated riparian (transitional area between aquatic and ...
  • Shrub changes with proximity to anthropogenic disturbance in boreal wetlands determined using bi-temporal airborne lidar in the Oil Sands Region, Alberta, Canada 
    Chasmer, Laura; Lima, E. Moura; Mahoney, Craig; Hopkinson, Christopher; Montgomery, Joshua; Cobbaert, Danielle (ElsevierArts and ScienceDepartment of Geograpy and EnvironmentUniversity of LethbridgeUniversidade Federale de Santa MariaAlberta Environment and Parkshttps://doi.org/10.1016/j.scitotenv.2021.146638, 2021)
    In this study, we used bi-temporal airborne lidar data to compare changes in vegetation height proximal to anthropogenic disturbances in the Oil Sands Region of Alberta, Canada. We hypothesize that relatively low-impact ...
  • Slope estimation from ICESat/GLAS 
    Mahoney, Craig; Kljun, Natascha; Los, Sietse O.; Chasmer, Laura; Hacker, Jorg M.; Hopkinson, Christopher; North, Peter R. J.; Rosette, Jacqueline A. B.; van Gorsel, Eva (M D P I A GArts and ScienceDepartment of GeographySwansea UniversityLund UniversityUniversity of LethbridgeFlinders UniversityCommonwealth Scientific and Industrial Research Organization (Australia), 2014)
    We present a novel technique to infer ground slope angle from waveform LiDAR, known as the independent slope method (ISM). The technique is applied to large footprint waveforms ( 60 m mean diameter) from the Ice, Cloud ...
  • Statistical modelling of the snow depth distribution in open alpine terrain 
    Grunewald, T.; Stotter, J.; Pomeroy, J.W.; Dadic, R.; Banos, I.M.; Marturia, J.; Spross, M.; Hopkinson, Christopher; Burlando, P.; Lehnig, M. (Copernicus PublicationsArts and ScienceDepartment of GeographyWSL Institute for Snow and Avalance Research SLFEcole Polytechnique Federale de LausanneUniversity of InnsbruckUniversity of SaskatchewanInstitute of Environmental EngineeringVictoria University of WellingtonInstitut Geologic de CatalunyaUniversity of Lethbridge, 2013)
    The spatial distribution of alpine snow covers is characterised by large variability. Taking this variability into account is important for many tasks including hydrology, glaciology, ecology or natural hazards. Statistical ...