The impact of ventilation patterns on calcite dissolution rates within karst conduits

摘要: Abstract Erosion rates in streams vary dramatically over time, as differences streamflow and sediment load enhance or inhibit erosion processes. Within cave streams, other bedrock channels incising soluble rocks, changes water chemistry are an important factor determining how will both time space. Prior studies surface springs, caves suggest that variation dissolved CO 2 is the strongest control on calcite dissolution rates. However, controls remain poorly quantified. Limited data ventilation of karst systems can substantially influence within conduits. interactions among ventilation, air–water exchange, dynamics have not been studied detail. In this study, three years series measurements gaseous , airflow velocity, specific conductance from Blowing Springs Cave, Arkansas, were analyzed used to estimate continuous quantify correlations between those potential physical chemical drivers. We find chimney effect creates temperature-driven switches direction, resulting seasonal regulate cave. As previous studies, partial pressure ( pCO ) rate variability. we also show rather than streamflow, driver rate, contrary typical situation channel where floods largely determine timing extent geomorphic work. At study site, typically active summer, during periods downdraft (airflow upper lower entrances), inactive winter, updraft entrances). Storms provide only minor perturbations overall pattern. direction modulates storms, with higher storm variability downdraft. Finally, compare our results limited set examined draw initial hypothesis evolution patterns strongly impacts evolve lifetime