[MITgcm-support] documentation for longwave flux partition in pkg/aim_v23/phy_radiat.F ??

[Rose, Brian]

Hi all,

I'm trying to understand how the longwave emissions are partitioned across the four spectral bands in pkg/aim_v23.

In pkg/aim_v23/phy_radiat.F
there is a SUBROUTINE RADSET
that gets called during initialization. As far as I can tell, this is building a lookup table for the partition as a function of temperature.
When the longwave code in SUBROUTINE RADLW is called during the model run, the partition is set by a call to this table with the current layer temperature.

My problem is that I don't understand the formula that is implemented in SUBROUTINE RADSET
I guess it must be a polynomial approximation to band integrals of the Planck function. But I can't find any documentation about it, either in the MITgcm code or in the SPEEDY documentation.

Anyone have any insight?

Thanks
Brian

|--------------------------------------------------------------------------------------------------------------------------------------|
  Brian E. J. Rose
     Assistant Professor
     Atmospheric & Environmental Sciences
     University at Albany

     Earth Sciences 315
     (518) 442-4477
     http://www.atmos.albany.edu/facstaff/brose/
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