Warmer spring in the sporadic permafrost zone increases annual methane emissions from a boreal peat landscape

Manuel Helbig, Université de Montréal, Département de géographie and Centre d’études nordiques, Montréal, QC, Canada, Oliver Sonnentag, Universite de Montreal, Departement de geographie, Montreal, QC, Canada and William L Quinton, Wilfrid Laurier University, Cold Regions Research Centre, Waterloo, ON, Canada