The NOAA Coral Reef Watch Experimental Ocean Acidification Product Suite (OAPS) offers an important synthesis of satellite and modeled environmental datasets to provide a synoptic estimate of sea surface carbonate chemistry in the Greater Caribbean Region. This tool compliments on-going geochemical surveys and monitoring efforts in the region by providing estimates of changing ocean chemistry on a broader spatial and temporal scale than shipboard observations alone can permit. The maps presented here are monthly averages of daily estimates derived according to Gledhill et al. (2008). Near-real-time estimates are modeled from daily fields of NOAA OI AVHRR-AMSRE SST, RTOFS modeled sea surface salinity (SSS), NOAA NCEP sea-level pressure (SLP), and estimates of atmospheric CO₂ derived from the NOAA Global Monitoring Division (GMD) Carbon Cycle Cooperative Global Air Sampling Network flask sample data at Key Biscayne, Fl (25.7°N) and Ragged Point, Barbados (13.2°N).