For information on web-based visualization, analysis and subsetting of Aquarius data via LAS (Live Access Server) hosted at PO.DAAC see the video tutorial on the PO.DAAC youtube channel:
The video also provides a tutorial on the Level 3 browser tool for quick visualization of Aquarius data.
While the illustrations provided focus on Aquarius datasets, the approach described is generally applicable to discovery of all PO.DAAC data holdings available LAS.
An accompanying LAS tutorial .pdf document is available at ftp://podaac.jpl.nasa.gov/misc/web/tutorials/aquarius-tutorials/LAS%20Quick_Start_Tutorial.pdf
This video is a snippet (20 minute duration) of broader instructional material related to the Aquarius/SAC-D mission presented as part of the "ADVICE" educational NASA/EOSDIS EarthData Webinar series: