Now I am working on a Tropical Cyclone project, and want to figure out the SST status when a TC passes by. I've been searching for SST products, yet there only show up to daily SST. My question is does there exist four-times daily SST, and if no, why is that?
The issue with satellite SST is that in most cases it is captured via infrared radiometers. Those sensors can't see through clouds. Daily products are used to try to remove the cloud effects. Alternatively, passive microwave radiation can be used (e.g., TMI, AMSR2, AMSR-E). It is not affected by cloud cover, but has lower horizontal resolution (~25km, vs 1-5km from IR). You can try to get the individual passes of each satellite and deal with gaps: For instance