The VIIRS SNPP global daily 4-km synoptic chlorophyll anomaly product generated routinely by the NOAA Ocean Color EDR team, and which has been viewable on the NOAA OCView tool, is now available through the NOAA CoastWatch Data Portal for both viewing (in context with other ocean and coastal parameters) and subsetting and downloading of NetCDF files (see Figure below). The anomaly, based on the analysis developed by Stumpf, et al. (2003), uses a difference from a 61-day median baseline to identify synoptic chlorophyll blooms.  In addition, there is a new chlorophyll-a anomaly ratio product (i.e., relative chlorophyll-a change). The NOAA OC global product suite includes both a difference and a ratio anomaly.
Screenshot of VIIRS SNPP chlorophyll anomaly (difference) product shown on the NOAA CoastWatch Data Portal with an example of a sub-set selection box drawn in the Arabian Sea.