Karley Campbell
University of Manitoba
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Publication
Featured researches published by Karley Campbell.
Annals of Glaciology | 2015
Shaun Mcdonald; Theodoro Koulis; Jens K. Ehn; Karley Campbell; Michel Gosselin; C. J. Mundy
Abstract The spectral dependence of natural light transmittance on ice algae concentration and snow depth in Arctic sea ice provides the potential to study the changing bottom-ice ecosystem using optical relationships. In this paper, we consider the use of functional data analysis techniques to describe such relationships. Specifically, we created a functional regression model describing spectral optical depth as a function of chlorophyll a concentration, snow depth and ice thickness. Measurements of the aforementioned covariates and surface and transmitted spectral irradiance were collected on landfast first-year sea ice in the High Arctic near Resolute Passage, Canada, during the spring of 2011 and used as model input. The derived model explains 75–84.5% of the variation in the observed spectral optical depth curves. No prior assumptions of snow/sea-ice optical properties are required in the application of this technique, as the model estimates the attenuation coefficients of each covariate using only the measurements mentioned above. The quality and simplicity of the model highlight the potential of functional data analysis to study the Arctic marine ecosystem.
Geophysical Research Letters | 2017
Karley Campbell; C. J. Mundy; Michel Gosselin; Jack C. Landy; A. Delaforge; Søren Rysgaard
The balance of photosynthesis and respiration by organisms like algae and bacteria determines whether sea ice is net heterotrophic or autotrophic. In turn this clarifies the influence of microbes on atmosphere-ice-ocean gas fluxes, and their contribution to the trophic system. In this study we define two phases of the spring bloom based on bottom-ice net community production and algal growth. Phase I was characterized by limited algal accumulation and low productivity, which at times resulted in net heterotrophy. Greater productivity in Phase II drove rapid algal accumulation that consistently produced net autotrophic conditions. The different phases were associated with seasonal shifts in light availability and species dominance. Results from this study demonstrate the importance of community respiration on spring productivity, as respiration rates can maintain a heterotrophic state independent of algal growth. This challenges previous assumptions of a fully autotrophic sea ice community during the ice-covered spring
Journal of Marine Systems | 2015
Karley Campbell; C. J. Mundy; David G. Barber; Michel Gosselin
The Cryosphere | 2014
Søren Rysgaard; Feiyue Wang; R. J. Galley; Rosina Grimm; Dirk Notz; Marcos Lemes; Nicolas-Xavier Geilfus; Amanda Chaulk; Alexander A. Hare; O. Crabeck; Brent Else; Karley Campbell; Lise Lotte Sørensen; Jakob Sievers; Tim Papakyriakou
Arctic | 2014
Karley Campbell; Christopher John Mundy; David G. Barber; Michel Gosselin
Marine Ecology Progress Series | 2015
Ashley Elliott; C. J. Mundy; Michel Gosselin; Michel Poulin; Karley Campbell; Feiyue Wang
Polar Biology | 2018
Karley Campbell; C. J. Mundy; Claude Belzile; A. Delaforge; Søren Rysgaard
Cold Regions Science and Technology | 2015
Brent Else; Søren Rysgaard; Karl M. Attard; Karley Campbell; O. Crabeck; R. J. Galley; Nicolas-Xavier Geilfus; Marcos Lemes; R Lueck; Tim Papakyriakou; Feiyue Wang
Marine Ecology Progress Series | 2017
Nicole M. Pogorzelec; C. J. Mundy; Catherine R. Findlay; Karley Campbell; Aura Diaz; Jens K. Ehn; Søren Rysgaard; Kathleen M. Gough
Geophysical Research Letters | 2017
Karley Campbell; C. J. Mundy; Michel Gosselin; Jack C. Landy; A. Delaforge; Søren Rysgaard