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Featured researches published by Karley Campbell.


Annals of Glaciology | 2015

A functional regression model for predicting optical depth and estimating attenuation coefficients in sea-ice covers near Resolute Passage, Canada

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

Net community production in the bottom of first‐year sea ice over the Arctic spring bloom

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

Characterizing the sea ice algae chlorophyll a-snow depth relationship over Arctic spring melt using transmitted irradiance

Karley Campbell; C. J. Mundy; David G. Barber; Michel Gosselin


The Cryosphere | 2014

Temporal dynamics of ikaite in experimental sea ice

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

Remote Estimates of Ice Algae Biomass and Their Response to Environmental Conditions during Spring Melt

Karley Campbell; Christopher John Mundy; David G. Barber; Michel Gosselin


Marine Ecology Progress Series | 2015

Spring production of mycosporine-like amino acids and other UV-absorbing compounds in sea ice-associated algae communities in the Canadian Arctic

Ashley Elliott; C. J. Mundy; Michel Gosselin; Michel Poulin; Karley Campbell; Feiyue Wang


Polar Biology | 2018

Seasonal dynamics of algal and bacterial communities in Arctic sea ice under variable snow cover

Karley Campbell; C. J. Mundy; Claude Belzile; A. Delaforge; Søren Rysgaard


Cold Regions Science and Technology | 2015

Under-ice eddy covariance flux measurements of heat, salt, momentum, and dissolved oxygen in an artificial sea ice pool

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

FTIR imaging analysis of cell content in sea-ice diatom taxa during a spring bloom in the lower Northwest Passage of the Canadian Arctic

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

Net community production in the bottom of first-year sea ice over the Arctic spring bloom: Spring Transition of Sea Ice NCP

Karley Campbell; C. J. Mundy; Michel Gosselin; Jack C. Landy; A. Delaforge; Søren Rysgaard

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Michel Gosselin

Université du Québec à Rimouski

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C. J. Mundy

University of Manitoba

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Kristina A. Brown

University of British Columbia

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Simon Bélanger

Université du Québec à Rimouski

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