MPI_Comm_split

http://mpitutorial.com/tutorials/introduction-to-groups-and-communicators/

http://mpitutorial.com/tutorials/mpi-scatter-gather-and-allgather/

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GFS Documentation

The details of the model are presented in the ncep office notes at

http://www.lib.ncep.noaa.gov/ncepofficenotes/files/on442.pdf

The GFS model, formerly known as the Medium Range Forecast model (MRF) was initially developed by J. Sela(1980,1982).

The introduction of gocart aerosol module is described in the ncep technical note

http://www.lib.ncep.noaa.gov/ncepofficenotes/files/on472.pdf

It clearly mentions that the model is incapable of carrying advection and other dynamics and operates similar to an offine model coupled with the physics module through a coupler.

The introduction of sigma hybrid pressure levels into the gfs

http://www.lib.ncep.noaa.gov/ncepofficenotes/files/on461.pdf

Understanding Spectral Modelling

http://journals.ametsoc.org/doi/pdf/10.1175/1520-0493(1980)108%3C1279%3ASMATNM%3E2.0.CO%3B2

The COLA-Atmosphere-Biosphere General Circulation Model

http://cola.gmu.edu/people/Shukla’s%20Articles/1997/The%20COLA%20Atmosphere.pdf

Recent Changes into the Global Forecast System

http://journals.ametsoc.org/doi/pdf/10.1175/1520-0434(1991)006%3C0425%3ARCIITG%3E2.0.CO%3B2

The NCEP Climate Forecast System Version 2

http://journals.ametsoc.org/doi/pdf/10.1175/JCLI-D-12-00823.1

Changes to the NCEP GFS by Srinivas Moorthy

http://www.nws.noaa.gov/om/tpb/484.pdf

The NCEP Climate Forecast System

http://journals.ametsoc.org/doi/full/10.1175/JCLI3812.1

http://www.dtcenter.org/GMTB/gfs_phys_doc/