The Oce vignette provides a good starting point. To get it, install Oce and
vignette("oce") in an R console.
Dan Kelley and Clark Richards are preparing to write a paper about the use of Oce, although the journal has not yet been selected. A natural journal for an in-depth exposition might be Computers and Geosciences. The AGU EOS Transactions and the CMOS Bulletin both seem like good choices for briefer introductions.
Dan Kelley’s blog has many items relating to Oce. His upcoming textbook, entitled Oceanographic Analysis with R, deals extensively with Oce. A provisional table of contents of that book is given below.