CbPM with Argo floats for subsurface net primary production

This code is to identify Deep Chlorophyll (and Biomass) Maxima, and to estimate Net Primary Production below the mixed layer, when a Deep Chlorophyll/Biomass Maximum occurs.

This code is an adaptation from the satellite-based CbPM "updated" model 
at the OSU Ocean Productivity web site 
(http://sites.science.oregonstate.edu/ocean.productivity/cbpm2.code.php), by 
Behrenfeld et al., (2005) and Westberry, et al. (2008). We created this code following Arteaga et al. (2022; https://zenodo.org/record/6599224#.Y2O_duzMKyt), which already adapted the CbPM to estimate depth-resolved phytoplankton growth and net primary production (NPP) from BGC-Argo profiles phytoplankton carbon and chlorophyll.