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a) Schematic of the opto‐electrochemical experiment setup. At the start of the experiment, acid is generated electrochemically local to the electrode and diffuses radially outward where it encounters the coccoliths. The dissolution of coccoliths under acid attack is monitored via darkfield microscopy. b) dissolution of a coccolith viewed from the coccolith side and top‐down. The purple arrows indicate the coccolith shrinkage as it dissolves under electrochemically induced acid.
