Abstract
A passive, rapid response, closed system was developed to measure in situ ecosystem CO 2 and CH 4 flux in 0.5-m 2 plots over diurnal, seasonal, and annual time scales in arctic tundra ecosystems. The system consists of a chamber measuring 0.75 m on a side, 0.3 m in height, with acrylic sides, a mylar top, and 6-10 cm radial fans to ensure thorough mixing of the chamber environment. CO 2 concentration and flux rates were measured using a Li-Cor 6200 Portable Photosynthesis System, which is capable of measuring 0.1 p.p.m. s −1 changes in CO 2 concentration. CH 4 flux rates were measured by sequential sampling of the CH 4 concentration in the chamber over the duration of a 15-20-min incubation period (...)
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