Recent observations suggest that karst landscapes may be an unaccounted sink for atmospheric CH 4 , but questions remain about the processes contributing to sub-atmospheric CH 4 mole fractions in caves. The CH 4 dynamics associated with karst environments were studied over 18 months at 6 locations in Buckner Cave, Southern Indiana by measuring the mole fractions and stable isotopic composition of CH 4 and carbon dioxide (CO 2). CO 2 mole fractions were used to infer seasonal changes in airflow. Samples were obtained on a monthly basis. CH 4 mole fractions ranged from 1.9 ± 0.1 ppm near the cave entrance to 0.1 ± 0.1 ppm in the more remote parts of the cave. The carbon and hydrogen stable isotopic compositions of CH 4 in the cave ranged from-58.7 to +7 ‰ (VPDB) and-170 to +10 ‰ (VSMOW), respectively. The isotopic data suggest that the CH 4 dynamics of Buckner Cave can be
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