WE PROPOSE TO CONTINUE THE OVER 22-YEAR TIME SERIES OF IN SITU OPTICAL DATA NEEDED TO MAINTAIN MODIS REMOTE SENSING REFLECTANCE CHLOROPHYLL AND ABSORPTION IOP ALGORITHMS USING OBSERVATIONS FROM THE BERMUDA ATLANTIC TIME-SERIES STUDY SITE IN THE NORTHWESTERN SARGASSO SEA. THIS EFFORT WAS MOST RECENTLY FUNDED UNDER THE ROSES 2013 COMPETITION TERRA AND AQUA - ALGORITHMS -EXISTING DATA PRODUCTS. THE PRESENT REQUEST IS TO CONTINUE ONLY THE WORK APPROPRIATE FOR MODIS OCEAN COLOR ALGORITHM MAINTENANCE ACCORDING TO THE NEEDS OUTLINED IN THE 2017 NASA EARTH SCIENCE DIVISION SENIOR REVIEW. WE PLAN TO COLLECT HIGH QUALITY DATA FOR MOD IS OCEAN PRODUCTS INCLUDING REMOTE SENSING REFLECTANCE SPECTRA CHLOROPHYLL A CONCENTRATION AND INHERENT OPTICAL PROPERTIES AND TO CO IPARE THEM TO THE CORRESPONDING MODIS DATA SETS. COMPONENT ABSORPTION SPECTRA WILL BE DETERMINED ON SAMPLES SHIPPED 3X YEARLY TO UCSB FOR ANALYSIS.