Ocean acidification has the potential to change the world's ocean and coastal ecosystems.  By bringing together researchers with diverse expertise across disciplines and institutions, OMEGAS seek to meet society's demands for scientific information on ocean acidification across the California Current Large Marine Ecosystem (CCLME). Interdisciplinary collaborations across institutions focus research to determine how ocean acidification affects marine organisms, populations, and ecosystems.   A centerpiece of OMEGAS work is a platform of long-term monitoring sites across a wide geographic range of the US West Coast.  From this platform, novel research methods are used to address complex ecological questions and develop predictive tools.  We measure how sea water chemistry changes over time and across geographic areas and determine if marine organisms are able to acclimatize and/or adapt to the present and predicted future levels of ocean acidificaiton. This work was initiated by a new award from the National Science Foundation and is part of OMEGAS' long-term vision for a cutting-edge scientific program to answer the significant questions of how changing ocean chemistry will affect health of marine ecosystems.