Elyn Humphreys

Biographic Data

ID6821403
NAMEElyn Humphreys
GIVEN NAMESElyn
FAMILY NAMEHumphreys
SIGNATUREHUMPHREYS E
AFFILIATIONSCarleton University
ORCID0000-0002-5397-2802
VERIFIEDYes
TOTAL WORKS6
TOTAL CITATIONS0
AUTHOR COUNT6
EDITOR COUNT0
FIRST PUBLICATION YEAR2013
LATEST PUBLICATION YEAR2023
H-INDEX0

  • Diel, seasonal, and inter-annual variation in carbon dioxide effluxes from lakes and reservoirs

    Open AccessMałgorzata Gołub, Nikaan Koupaei‐Abyazani et al.ARTICLEEnvironmental Research Letters2023

    Accounting for temporal changes in carbon dioxide (CO 2 ) effluxes from freshwaters remains a challenge for global and regional carbon budgets. Here, we synthesize 171 site-months of flux measurements of CO 2 based on the eddy covariance method from 13 lakes and reservoirs in the Northern Hemisphere, and quantify dynamics at multiple temporal scales. We found pronounced sub-annual variability in CO 2 flux at all sites. By accounting for diel vari…

  • Soil respiration strongly offsets carbon uptake in Alaska and Northwest Canada

    Open AccessJennifer D Watts, Susan M Natali et al.ARTICLEEnvironmental Research Letters2021

    Soil respiration (i.e. from soils and roots) provides one of the largest global fluxes of carbon dioxide (CO 2 ) to the atmosphere and is likely to increase with warming, yet the magnitude of soil respiration from rapidly thawing Arctic-boreal regions is not well understood. To address this knowledge gap, we first compiled a new CO 2 flux database for permafrost-affected tundra and boreal ecosystems in Alaska and Northwest Canada. We then used th…

  • Shallow soils are warmer under trees and tall shrubs across Arctic and Boreal ecosystems

    Open AccessHeather Kropp, M M Loranty et al.ARTICLEEnvironmental Research Letters2020

    Soils are warming as air temperatures rise across the Arctic and Boreal region concurrent with the expansion of tall-statured shrubs and trees in the tundra. Changes in vegetation structure and function are expected to alter soil thermal regimes, thereby modifying climate feedbacks related to permafrost thaw and carbon cycling. However, current understanding of vegetation impacts on soil temperature is limited to local or regional scales and lack…

  • The biophysical climate mitigation potential of boreal peatlands during the growing season

    Open AccessManuel Helbig, J M Waddington et al.ARTICLEEnvironmental Research Letters2020

    Peatlands and forests cover large areas of the boreal biome and are critical for global climate regulation. They also regulate regional climate through heat and water vapour exchange with the atmosphere. Understanding how land-atmosphere interactions in peatlands differ from forests may therefore be crucial for modelling boreal climate system dynamics and for assessing climate benefits of peatland conservation and restoration. To assess the bioph…

  • Tundra shrub effects on growing season energy and carbon dioxide exchange

    Open AccessPeter M Lafleur, Elyn Humphreys et al.ARTICLEEnvironmental Research Letters2018

    Increased shrub cover on the Arctic tundra is expected to impact ecosystem-atmosphere exchanges of carbon and energy resulting in feedbacks to the climate system, yet few direct measurements of shrub tundra-atmosphere exchanges are available to corroborate expectations. Here we present energy and carbon dioxide (CO _2 ) fluxes measured using the eddy covariance technique over six growing seasons at three closely located tundra sites in Canada’s L…

  • Modeling the influence of snow cover on low Arctic net ecosystem exchange

    Open AccessKristina Luus, K A Luus et al.ARTICLEEnvironmental Research Letters2013

    The Arctic net ecosystem exchange (NEE) of CO2 between the land surface and the atmosphere is influenced by the timing of snow onset and melt. The objective of this study was to examine whether uncertainty in model estimates of NEE could be reduced by representing the influence of snow on NEE using remote sensing observations of snow cover area (SCA). Observations of NEE and time-lapse images of SCA were collected over four locations at a low Arc…