Initial Conditions NetCDF File
Biology initial conditions file, specifying initial biomass and size. This is created as a text .cdf file, then packed into a .nc file. See below for instructions on packing. The biology .cdf file also specifies the box geometry file to use.
There is a tool to help you build this file. AtlantisNCGen
NetCDF structure - https://wiki.csiro.au/display/Atlantis/Atlantis+NetCDF+Structure
Notes on variables - which can get ignored etc. variable_meanings.xlsx