The atmosphere, ocean and snow level 3 STA (statistics) MAPs are maps projected using estimated representative values for each type of data from Level 3 Binned. The K490 is K490 extinction coefficient.
TOGA COARE data is available from the TOGA COARE Data Information System
"http://www.ncdc.noaa.gov/oa/coare/index.html", the NOAA National Oceanographic
Data Center "http://www.nodc.noaa.gov", ...