Supplemental Material, SupplementaryMaterial_Virkkalaetal - The current state of CO <sub>2</sub> flux chamber studies in the Arctic tundra: A review VirkkalaAnna-Maria VirtanenTarmo LehtonenAleksi RinneJanne LuotoMiska 2017 <p> Supplemental Material, SupplementaryMaterial_Virkkalaetal for The current state of CO <sub>2</sub> flux chamber studies in the Arctic tundra: A review by Anna-Maria Virkkala, Tarmo Virtanen, Aleksi Lehtonen, Janne Rinne, Miska Luoto in Progress in Physical Geography: Earth and Environment </p>