Abstract: Step velocities were measured as the average of acute and obtuse step velocities during Iceland Spar dissolution in natural seawater under Atomic Force Microscope (AFM). 0.04 mg/mL carbonic anhydrase was added to seawater to investigate the effect of the dissolution-promoting enzyme on step retreat velocities. Other Description: Dong, S., Berelson, W., Teng, H., Rollins, N., Pirbadian, S., El-Naggar, M., Adkins, J., A Mechanistic Study of Carbonic Anhydrase Enhanced Calcite Dissolution. Geophysical Research Letters (in review)