Natural variations in calcite dissolution rates in streams: Controls, implications, and open questions

摘要: Models of bedrock channel evolution typically assume that chemical erosion is negligible in comparison to mechanical erosion. While this assumption reasonable for channels silicate rocks, it questionable within highly soluble strata such as carbonates. The magnitude and variability calcite dissolution rates streams has remained a critical unknown models incision karst conduit formation. Here we use U.S. Geological Survey data estimate from 77 different located wide range settings. calculated are commonly on the order ∼1 mmyr−1, which 1 2 orders larger than previous estimates. We also find PCO2 strongest control at-a-site variability, though some sites display dilution-controlled variability. Typically, vary relatively narrow range, important implications relative importance