Global Mean Determinations (IMAGE) University of California - Santa Barbara Caption Global mean determinations of the efficiency of the biological pump from (left) the present food-web model and (right) an empirical method that models export efficiency as a function of the sea surface temperature (SST). Credit UCSB Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.